Hi Michal,
On Tue, Feb 28, 2017 at 09:12:24AM +0100, Michal Hocko wrote:
> On Tue 28-02-17 14:17:23, Minchan Kim wrote:
> > On Mon, Feb 27, 2017 at 10:44:49AM +0100, Michal Hocko wrote:
> > > On Mon 27-02-17 18:02:36, Minchan Kim wrote:
> > > [...]
> > > > >From 9779a1c5d32e2edb64da5cdfcd6f9737b94a247a Mon Sep 17 00:00:00 2001
> > > > From: Minchan Kim <[email protected]>
> > > > Date: Mon, 27 Feb 2017 17:39:06 +0900
> > > > Subject: [PATCH] mm: use up highatomic before OOM kill
> > > >
> > > > Not-Yet-Signed-off-by: Minchan Kim <[email protected]>
> > > > ---
> > > > mm/page_alloc.c | 14 ++++----------
> > > > 1 file changed, 4 insertions(+), 10 deletions(-)
> > > >
> > > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > > > index 614cd0397ce3..e073cca4969e 100644
> > > > --- a/mm/page_alloc.c
> > > > +++ b/mm/page_alloc.c
> > > > @@ -3549,16 +3549,6 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned order,
> > > > *no_progress_loops = 0;
> > > > else
> > > > (*no_progress_loops)++;
> > > > -
> > > > - /*
> > > > - * Make sure we converge to OOM if we cannot make any progress
> > > > - * several times in the row.
> > > > - */
> > > > - if (*no_progress_loops > MAX_RECLAIM_RETRIES) {
> > > > - /* Before OOM, exhaust highatomic_reserve */
> > > > - return unreserve_highatomic_pageblock(ac, true);
> > > > - }
> > > > -
> > > > /*
> > > > * Keep reclaiming pages while there is a chance this will lead
> > > > * somewhere. If none of the target zones can satisfy our allocation
> > > > @@ -3821,6 +3811,10 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
> > > > if (read_mems_allowed_retry(cpuset_mems_cookie))
> > > > goto retry_cpuset;
> > > >
> > > > + /* Before OOM, exhaust highatomic_reserve */
> > > > + if (unreserve_highatomic_pageblock(ac, true))
> > > > + goto retry;
> > > > +
> > >
> > > OK, this can help for higher order requests when we do not exhaust all
> > > the retries and fail on compaction but I fail to see how can this help
> > > for order-0 requets which was what happened in this case. I am not
> > > saying this is wrong, though.
> >
> > The should_reclaim_retry can return false although no_progress_loop is less
> > than MAX_RECLAIM_RETRIES unless eligible zones has enough reclaimable pages
> > by the progress_loop.
>
> Yes, sorry I should have been more clear. I was talking about this
> particular case where we had a lot of reclaimable pages (a lot of
> anonymous with the swap available).
This reports shows two problems. Why we see OOM 1) enough *free* pages and
2) enough *freeable* pages.
I just pointed out 1) and sent the patch to solve it.
About 2), one of my imaginary scenario is inactive anon list is full of
pinned pages so VM can unmap them successfully in shrink_page_list but fail
to free due to increased page refcount. In that case, the page will be added
to inactive anonymous LRU list again without activating so inactive_list_is_low
on anonymous LRU is always false. IOW, there is no deactivation from active list.
It's just my picture without no clue. ;-)
On 02.03.2017 08:17, Minchan Kim wrote:
> Hi Michal,
>
> On Tue, Feb 28, 2017 at 09:12:24AM +0100, Michal Hocko wrote:
>> On Tue 28-02-17 14:17:23, Minchan Kim wrote:
>>> On Mon, Feb 27, 2017 at 10:44:49AM +0100, Michal Hocko wrote:
>>>> On Mon 27-02-17 18:02:36, Minchan Kim wrote:
>>>> [...]
>>>>> >From 9779a1c5d32e2edb64da5cdfcd6f9737b94a247a Mon Sep 17 00:00:00 2001
>>>>> From: Minchan Kim <[email protected]>
>>>>> Date: Mon, 27 Feb 2017 17:39:06 +0900
>>>>> Subject: [PATCH] mm: use up highatomic before OOM kill
>>>>>
>>>>> Not-Yet-Signed-off-by: Minchan Kim <[email protected]>
>>>>> ---
>>>>> mm/page_alloc.c | 14 ++++----------
>>>>> 1 file changed, 4 insertions(+), 10 deletions(-)
>>>>>
>>>>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>>>>> index 614cd0397ce3..e073cca4969e 100644
>>>>> --- a/mm/page_alloc.c
>>>>> +++ b/mm/page_alloc.c
>>>>> @@ -3549,16 +3549,6 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned order,
>>>>> *no_progress_loops = 0;
>>>>> else
>>>>> (*no_progress_loops)++;
>>>>> -
>>>>> - /*
>>>>> - * Make sure we converge to OOM if we cannot make any progress
>>>>> - * several times in the row.
>>>>> - */
>>>>> - if (*no_progress_loops > MAX_RECLAIM_RETRIES) {
>>>>> - /* Before OOM, exhaust highatomic_reserve */
>>>>> - return unreserve_highatomic_pageblock(ac, true);
>>>>> - }
>>>>> -
>>>>> /*
>>>>> * Keep reclaiming pages while there is a chance this will lead
>>>>> * somewhere. If none of the target zones can satisfy our allocation
>>>>> @@ -3821,6 +3811,10 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
>>>>> if (read_mems_allowed_retry(cpuset_mems_cookie))
>>>>> goto retry_cpuset;
>>>>>
>>>>> + /* Before OOM, exhaust highatomic_reserve */
>>>>> + if (unreserve_highatomic_pageblock(ac, true))
>>>>> + goto retry;
>>>>> +
>>>> OK, this can help for higher order requests when we do not exhaust all
>>>> the retries and fail on compaction but I fail to see how can this help
>>>> for order-0 requets which was what happened in this case. I am not
>>>> saying this is wrong, though.
>>> The should_reclaim_retry can return false although no_progress_loop is less
>>> than MAX_RECLAIM_RETRIES unless eligible zones has enough reclaimable pages
>>> by the progress_loop.
>> Yes, sorry I should have been more clear. I was talking about this
>> particular case where we had a lot of reclaimable pages (a lot of
>> anonymous with the swap available).
> This reports shows two problems. Why we see OOM 1) enough *free* pages and
> 2) enough *freeable* pages.
>
> I just pointed out 1) and sent the patch to solve it.
>
> About 2), one of my imaginary scenario is inactive anon list is full of
> pinned pages so VM can unmap them successfully in shrink_page_list but fail
> to free due to increased page refcount. In that case, the page will be added
> to inactive anonymous LRU list again without activating so inactive_list_is_low
> on anonymous LRU is always false. IOW, there is no deactivation from active list.
>
> It's just my picture without no clue. ;-)
With latest kernels (4.11.0-0.rc2.git0.2.fc26.x86_64) I'm having the
issue that swapping is active all the time after some runtime (~1day).
top - 07:30:17 up 1 day, 19:42, 1 user, load average: 13.71, 16.98, 15.36
Tasks: 130 total, 2 running, 128 sleeping, 0 stopped, 0 zombie
%Cpu(s): 15.8 us, 33.5 sy, 0.0 ni, 3.9 id, 34.5 wa, 4.9 hi, 1.0 si,
6.4 st
KiB Mem : 369700 total, 5484 free, 311556 used, 52660 buff/cache
KiB Swap: 2064380 total, 1187684 free, 876696 used. 20340 avail Mem
[root@smtp ~]# vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system--
------cpu-----
r b swpd free buff cache si so bi bo in cs us sy
id wa st
3 1 876280 7132 16536 64840 238 226 1027 258 80 97 2 3
83 11 1
0 4 876140 3812 10520 64552 3676 168 11840 1100 2255 2582 7
13 8 70 3
0 3 875372 3628 4024 56160 5424 64 10004 476 2157 2580 2
14 0 83 2
0 4 875560 24056 2208 56296 9032 2180 39928 2388 4111 4549 10
32 0 55 3
2 2 875660 7540 5256 58220 5536 1604 48756 1864 4505 4196 12
23 5 58 3
0 3 875264 3664 2120 57596 2304 116 17904 560 2223 1825 15
15 0 67 3
0 2 875564 3800 588 57856 1340 1068 14780 1184 1390 1364 12
10 0 77 3
1 2 875724 3740 372 53988 3104 928 16884 1068 1560 1527 3
12 0 83 3
0 3 881096 3708 532 52220 4604 5872 21004 6104 2752 2259 7
18 5 67 2
The following commit is included in that version:
commit 710531320af876192d76b2c1f68190a1df941b02
Author: Michal Hocko <[email protected]>
Date: Wed Feb 22 15:45:58 2017 -0800
mm, vmscan: cleanup lru size claculations
commit fd538803731e50367b7c59ce4ad3454426a3d671 upstream.
But still OOMs:
[157048.030760] clamscan: page allocation stalls for 19405ms, order:0,
mode:0x14200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null)
[157048.031985] clamscan cpuset=/ mems_allowed=0
[157048.031993] CPU: 1 PID: 9597 Comm: clamscan Not tainted
4.11.0-0.rc2.git0.2.fc26.x86_64 #1
[157048.033197] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.9.3 04/01/2014
[157048.034382] Call Trace:
[157048.035532] dump_stack+0x63/0x84
[157048.036735] warn_alloc+0x10c/0x1b0
[157048.037768] __alloc_pages_slowpath+0x93d/0xe60
[157048.038873] ? dd_dispatch_request+0x2b/0x1a0
[157048.041033] ? get_page_from_freelist+0x122/0xbf0
[157048.042435] __alloc_pages_nodemask+0x290/0x2b0
[157048.043662] alloc_pages_vma+0xa0/0x2b0
[157048.044796] __read_swap_cache_async+0x146/0x210
[157048.045841] read_swap_cache_async+0x26/0x60
[157048.046858] swapin_readahead+0x186/0x230
[157048.047854] ? radix_tree_lookup_slot+0x22/0x50
[157048.049006] ? find_get_entry+0x20/0x140
[157048.053109] ? pagecache_get_page+0x2c/0x2e0
[157048.054179] do_swap_page+0x276/0x7b0
[157048.055138] __handle_mm_fault+0x6fd/0x1160
[157048.057571] ? pick_next_task_fair+0x48c/0x560
[157048.058608] handle_mm_fault+0xb3/0x250
[157048.059622] __do_page_fault+0x23f/0x4c0
[157048.068926] trace_do_page_fault+0x41/0x120
[157048.070143] do_async_page_fault+0x51/0xa0
[157048.071254] async_page_fault+0x28/0x30
[157048.072606] RIP: 0033:0x7f78659eb675
[157048.073858] RSP: 002b:00007ffcaba111b8 EFLAGS: 00010202
[157048.075192] RAX: 0000000000000941 RBX: 00007f785957e8d0 RCX:
00007f784e968b48
[157048.076609] RDX: 00007f784f87bce8 RSI: 00007f7851fdb0cb RDI:
00007f7866726000
[157048.077809] RBP: 00007f785957e910 R08: 0000000000040000 R09:
0000000000000000
[157048.078935] R10: ffffffffffffff48 R11: 0000000000000246 R12:
00007f78600c81c0
[157048.080028] R13: 00007f785957e970 R14: 00007f78594ffba8 R15:
0000000003406237
[157048.081827] Mem-Info:
[157048.083005] active_anon:19902 inactive_anon:19920 isolated_anon:383
active_file:816 inactive_file:529 isolated_file:0
unevictable:0 dirty:0 writeback:19 unstable:0
slab_reclaimable:4225 slab_unreclaimable:6483
mapped:942 shmem:3 pagetables:3553 bounce:0
free:944 free_pcp:87 free_cma:0
[157048.089470] Node 0 active_anon:79552kB inactive_anon:79588kB
active_file:3108kB inactive_file:2144kB unevictable:0kB
isolated(anon):1624kB isolated(file):0kB mapped:3612kB dirty:0kB
writeback:76kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp:
12kB writeback_tmp:0kB unstable:0kB pages_scanned:247 all_unreclaimable? no
[157048.092318] Node 0 DMA free:1408kB min:104kB low:128kB high:152kB
active_anon:664kB inactive_anon:3124kB active_file:48kB
inactive_file:40kB unevictable:0kB writepending:0kB present:15992kB
managed:15908kB mlocked:0kB slab_reclaimable:564kB
slab_unreclaimable:2148kB kernel_stack:92kB pagetables:1328kB bounce:0kB
free_pcp:0kB local_pcp:0kB free_cma:0kB
[157048.096008] lowmem_reserve[]: 0 327 327 327 327
[157048.097234] Node 0 DMA32 free:2576kB min:2264kB low:2828kB
high:3392kB active_anon:78844kB inactive_anon:76612kB active_file:2840kB
inactive_file:1896kB unevictable:0kB writepending:76kB present:376688kB
managed:353792kB mlocked:0kB slab_reclaimable:16336kB
slab_unreclaimable:23784kB kernel_stack:2388kB pagetables:12884kB
bounce:0kB free_pcp:644kB local_pcp:312kB free_cma:0kB
[157048.101118] lowmem_reserve[]: 0 0 0 0 0
[157048.102190] Node 0 DMA: 37*4kB (UEH) 12*8kB (H) 13*16kB (H) 10*32kB
(H) 4*64kB (H) 3*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB =
1412kB
[157048.104989] Node 0 DMA32: 79*4kB (UMEH) 199*8kB (UMEH) 18*16kB (UMH)
5*32kB (H) 2*64kB (H) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB
= 2484kB
[157048.107789] Node 0 hugepages_total=0 hugepages_free=0
hugepages_surp=0 hugepages_size=2048kB
[157048.107790] 2027 total pagecache pages
[157048.109125] 710 pages in swap cache
[157048.115088] Swap cache stats: add 36179491, delete 36179123, find
86964755/101977142
[157048.116934] Free swap = 808064kB
[157048.118466] Total swap = 2064380kB
[157048.122828] 98170 pages RAM
[157048.124039] 0 pages HighMem/MovableOnly
[157048.125051] 5745 pages reserved
[157048.125997] 0 pages cma reserved
[157048.127008] 0 pages hwpoisoned
Thnx.
Ciao,
Gerhard
On Thu 16-03-17 07:38:08, Gerhard Wiesinger wrote:
[...]
> The following commit is included in that version:
> commit 710531320af876192d76b2c1f68190a1df941b02
> Author: Michal Hocko <[email protected]>
> Date: Wed Feb 22 15:45:58 2017 -0800
>
> mm, vmscan: cleanup lru size claculations
>
> commit fd538803731e50367b7c59ce4ad3454426a3d671 upstream.
This patch shouldn't make any difference. It is a cleanup patch.
I guess you meant 71ab6cfe88dc ("mm, vmscan: consider eligible zones in
get_scan_count") but even that one shouldn't make any difference for 64b
systems.
> But still OOMs:
> [157048.030760] clamscan: page allocation stalls for 19405ms, order:0, mode:0x14200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null)
This is not OOM it is an allocation stall. The allocation request cannot
simply make forward progress for more than 10s. This alone is bad but
considering this is GFP_HIGHUSER_MOVABLE which has the full reclaim
capabilities I would suspect your workload overcommits the available
memory too much. You only have ~380MB of RAM with ~160MB sitting in the
anonymous memory, almost nothing in the page cache so I am not wondering
that you see a constant swap activity. There seems to be only 40M in the
slab so we are still missing ~180MB which is neither on the LRU lists
nor allocated by slab. This means that some kernel subsystem allocates
from the page allocator directly.
That being said, I believe that what you are seeing is not a bug in the
MM subsystem but rather some susbsytem using more memory than it used to
before so your workload doesn't fit into the amount of memory you have
anymore.
[...]
> [157048.081827] Mem-Info:
> [157048.083005] active_anon:19902 inactive_anon:19920 isolated_anon:383
> active_file:816 inactive_file:529 isolated_file:0
> unevictable:0 dirty:0 writeback:19 unstable:0
> slab_reclaimable:4225 slab_unreclaimable:6483
> mapped:942 shmem:3 pagetables:3553 bounce:0
> free:944 free_pcp:87 free_cma:0
> [157048.089470] Node 0 active_anon:79552kB inactive_anon:79588kB
> active_file:3108kB inactive_file:2144kB unevictable:0kB
> isolated(anon):1624kB isolated(file):0kB mapped:3612kB dirty:0kB
> writeback:76kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 12kB
> writeback_tmp:0kB unstable:0kB pages_scanned:247 all_unreclaimable? no
> [157048.092318] Node 0 DMA free:1408kB min:104kB low:128kB high:152kB
> active_anon:664kB inactive_anon:3124kB active_file:48kB inactive_file:40kB
> unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB
> slab_reclaimable:564kB slab_unreclaimable:2148kB kernel_stack:92kB
> pagetables:1328kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
> [157048.096008] lowmem_reserve[]: 0 327 327 327 327
> [157048.097234] Node 0 DMA32 free:2576kB min:2264kB low:2828kB high:3392kB
> active_anon:78844kB inactive_anon:76612kB active_file:2840kB
> inactive_file:1896kB unevictable:0kB writepending:76kB present:376688kB
> managed:353792kB mlocked:0kB slab_reclaimable:16336kB
> slab_unreclaimable:23784kB kernel_stack:2388kB pagetables:12884kB bounce:0kB
> free_pcp:644kB local_pcp:312kB free_cma:0kB
> [157048.101118] lowmem_reserve[]: 0 0 0 0 0
> [157048.102190] Node 0 DMA: 37*4kB (UEH) 12*8kB (H) 13*16kB (H) 10*32kB (H)
> 4*64kB (H) 3*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1412kB
> [157048.104989] Node 0 DMA32: 79*4kB (UMEH) 199*8kB (UMEH) 18*16kB (UMH)
> 5*32kB (H) 2*64kB (H) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB =
> 2484kB
> [157048.107789] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0
> hugepages_size=2048kB
> [157048.107790] 2027 total pagecache pages
> [157048.109125] 710 pages in swap cache
> [157048.115088] Swap cache stats: add 36179491, delete 36179123, find
> 86964755/101977142
> [157048.116934] Free swap = 808064kB
> [157048.118466] Total swap = 2064380kB
> [157048.122828] 98170 pages RAM
> [157048.124039] 0 pages HighMem/MovableOnly
> [157048.125051] 5745 pages reserved
> [157048.125997] 0 pages cma reserved
> [157048.127008] 0 pages hwpoisoned
>
>
> Thnx.
>
> Ciao,
> Gerhard
--
Michal Hocko
SUSE Labs
On Thu, Mar 16, 2017 at 09:27:14AM +0100, Michal Hocko wrote:
> On Thu 16-03-17 07:38:08, Gerhard Wiesinger wrote:
> [...]
> > The following commit is included in that version:
> > commit 710531320af876192d76b2c1f68190a1df941b02
> > Author: Michal Hocko <[email protected]>
> > Date: Wed Feb 22 15:45:58 2017 -0800
> >
> > mm, vmscan: cleanup lru size claculations
> >
> > commit fd538803731e50367b7c59ce4ad3454426a3d671 upstream.
>
> This patch shouldn't make any difference. It is a cleanup patch.
> I guess you meant 71ab6cfe88dc ("mm, vmscan: consider eligible zones in
> get_scan_count") but even that one shouldn't make any difference for 64b
> systems.
>
> > But still OOMs:
> > [157048.030760] clamscan: page allocation stalls for 19405ms, order:0, mode:0x14200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null)
>
> This is not OOM it is an allocation stall. The allocation request cannot
> simply make forward progress for more than 10s. This alone is bad but
> considering this is GFP_HIGHUSER_MOVABLE which has the full reclaim
> capabilities I would suspect your workload overcommits the available
> memory too much. You only have ~380MB of RAM with ~160MB sitting in the
> anonymous memory, almost nothing in the page cache so I am not wondering
> that you see a constant swap activity. There seems to be only 40M in the
> slab so we are still missing ~180MB which is neither on the LRU lists
> nor allocated by slab. This means that some kernel subsystem allocates
> from the page allocator directly.
>
> That being said, I believe that what you are seeing is not a bug in the
> MM subsystem but rather some susbsytem using more memory than it used to
> before so your workload doesn't fit into the amount of memory you have
> anymore.
>
While on the topic of understanding allocation stalls, Philip Freeman recently
mailed linux-kernel with a similar report, and in his case there are plenty of
page cache pages. It was also a GFP_HIGHUSER_MOVABLE 0-order allocation.
I'm no MM expert, but it appears a bit broken for such a low-order allocation
to stall on the order of 10 seconds when there's plenty of reclaimable pages,
in addition to mostly unused and abundant swap space on SSD.
Regards,
Vito Caputo
On Thu 16-03-17 01:47:33, [email protected] wrote:
[...]
> While on the topic of understanding allocation stalls, Philip Freeman recently
> mailed linux-kernel with a similar report, and in his case there are plenty of
> page cache pages. It was also a GFP_HIGHUSER_MOVABLE 0-order allocation.
care to point me to the report?
> I'm no MM expert, but it appears a bit broken for such a low-order allocation
> to stall on the order of 10 seconds when there's plenty of reclaimable pages,
> in addition to mostly unused and abundant swap space on SSD.
yes this might indeed signal a problem.
--
Michal Hocko
SUSE Labs
On Thu, Mar 16, 2017 at 10:08:44AM +0100, Michal Hocko wrote:
> On Thu 16-03-17 01:47:33, [email protected] wrote:
> [...]
> > While on the topic of understanding allocation stalls, Philip Freeman recently
> > mailed linux-kernel with a similar report, and in his case there are plenty of
> > page cache pages. It was also a GFP_HIGHUSER_MOVABLE 0-order allocation.
>
> care to point me to the report?
http://lkml.iu.edu/hypermail/linux/kernel/1703.1/06360.html
>
> > I'm no MM expert, but it appears a bit broken for such a low-order allocation
> > to stall on the order of 10 seconds when there's plenty of reclaimable pages,
> > in addition to mostly unused and abundant swap space on SSD.
>
> yes this might indeed signal a problem.
Well maybe I missed something obvious that a better informed eye will catch.
Regards,
Vito Caputo
On Thu 16-03-17 02:23:18, [email protected] wrote:
> On Thu, Mar 16, 2017 at 10:08:44AM +0100, Michal Hocko wrote:
> > On Thu 16-03-17 01:47:33, [email protected] wrote:
> > [...]
> > > While on the topic of understanding allocation stalls, Philip Freeman recently
> > > mailed linux-kernel with a similar report, and in his case there are plenty of
> > > page cache pages. It was also a GFP_HIGHUSER_MOVABLE 0-order allocation.
> >
> > care to point me to the report?
>
> http://lkml.iu.edu/hypermail/linux/kernel/1703.1/06360.html
Thanks. It is gone from my lkml mailbox. Could you CC me (and linux-mm) please?
> >
> > > I'm no MM expert, but it appears a bit broken for such a low-order allocation
> > > to stall on the order of 10 seconds when there's plenty of reclaimable pages,
> > > in addition to mostly unused and abundant swap space on SSD.
> >
> > yes this might indeed signal a problem.
>
> Well maybe I missed something obvious that a better informed eye will catch.
Nothing really obvious. There is indeed a lot of anonymous memory to
swap out. Almost no pages on file LRU lists (active_file:759
inactive_file:749) but 158783 total pagecache pages so we have to have a
lot of pages in the swap cache. I would probably have to see more data
to make a full picture.
--
Michal Hocko
SUSE Labs
On 16.03.2017 10:39, Michal Hocko wrote:
> On Thu 16-03-17 02:23:18, [email protected] wrote:
>> On Thu, Mar 16, 2017 at 10:08:44AM +0100, Michal Hocko wrote:
>>> On Thu 16-03-17 01:47:33, [email protected] wrote:
>>> [...]
>>>> While on the topic of understanding allocation stalls, Philip Freeman recently
>>>> mailed linux-kernel with a similar report, and in his case there are plenty of
>>>> page cache pages. It was also a GFP_HIGHUSER_MOVABLE 0-order allocation.
>>> care to point me to the report?
>> http://lkml.iu.edu/hypermail/linux/kernel/1703.1/06360.html
> Thanks. It is gone from my lkml mailbox. Could you CC me (and linux-mm) please?
>
>>>
>>>> I'm no MM expert, but it appears a bit broken for such a low-order allocation
>>>> to stall on the order of 10 seconds when there's plenty of reclaimable pages,
>>>> in addition to mostly unused and abundant swap space on SSD.
>>> yes this might indeed signal a problem.
>> Well maybe I missed something obvious that a better informed eye will catch.
> Nothing really obvious. There is indeed a lot of anonymous memory to
> swap out. Almost no pages on file LRU lists (active_file:759
> inactive_file:749) but 158783 total pagecache pages so we have to have a
> lot of pages in the swap cache. I would probably have to see more data
> to make a full picture.
>
Why does the kernel prefer to swapin/out and not use
a.) the free memory?
b.) the buffer/cache?
There is ~100M memory available but kernel swaps all the time ...
Any ideas?
Kernel: 4.9.14-200.fc25.x86_64
top - 17:33:43 up 28 min, 3 users, load average: 3.58, 1.67, 0.89
Tasks: 145 total, 4 running, 141 sleeping, 0 stopped, 0 zombie
%Cpu(s): 19.1 us, 56.2 sy, 0.0 ni, 4.3 id, 13.4 wa, 2.0 hi, 0.3 si,
4.7 st
KiB Mem : 230076 total, 61508 free, 123472 used, 45096 buff/cache
procs -----------memory---------- ---swap-- -----io---- -system--
------cpu-----
r b swpd free buff cache si so bi bo in cs us sy
id wa st
3 5 303916 60372 328 43864 27828 200 41420 236 6984 11138 11
47 6 23 14
5 4 292852 52904 756 58584 19600 448 48780 540 8088 10528 18
61 1 7 13
3 3 288792 49052 1152 65924 4856 576 9824 1100 4324 5720 7
18 2 64 8
2 2 283676 54160 716 67604 6332 344 31740 964 3879 5055 12 34
10 37 7
3 3 286852 66712 216 53136 28064 4832 56532 4920 9175 12625 10
55 12 14 10
2 0 299680 62428 196 53316 36312 13164 54728 13212 16820 25283
7 56 18 12 7
1 1 300756 63220 624 58160 17944 1260 24528 1304 5804 9302 3
22 38 34 3
Thnx.
Ciao,
Gerhard
On Fri 17-03-17 17:37:48, Gerhard Wiesinger wrote:
[...]
> Why does the kernel prefer to swapin/out and not use
>
> a.) the free memory?
It will use all the free memory up to min watermark which is set up
based on min_free_kbytes.
> b.) the buffer/cache?
the memory reclaim is strongly biased towards page cache and we try to
avoid swapout as much as possible (see get_scan_count).
> There is ~100M memory available but kernel swaps all the time ...
>
> Any ideas?
>
> Kernel: 4.9.14-200.fc25.x86_64
>
> top - 17:33:43 up 28 min, 3 users, load average: 3.58, 1.67, 0.89
> Tasks: 145 total, 4 running, 141 sleeping, 0 stopped, 0 zombie
> %Cpu(s): 19.1 us, 56.2 sy, 0.0 ni, 4.3 id, 13.4 wa, 2.0 hi, 0.3 si, 4.7
> st
> KiB Mem : 230076 total, 61508 free, 123472 used, 45096 buff/cache
>
> procs -----------memory---------- ---swap-- -----io---- -system--
> ------cpu-----
> r b swpd free buff cache si so bi bo in cs us sy id wa st
> 3 5 303916 60372 328 43864 27828 200 41420 236 6984 11138 11 47 6 23 14
I am really surprised to see any reclaim at all. 26% of free memory
doesn't sound as if we should do a reclaim at all. Do you have an
unusual configuration of /proc/sys/vm/min_free_kbytes ? Or is there
anything running inside a memory cgroup with a small limit?
--
Michal Hocko
SUSE Labs
On Fri 17-03-17 21:08:31, Gerhard Wiesinger wrote:
> On 17.03.2017 18:13, Michal Hocko wrote:
> >On Fri 17-03-17 17:37:48, Gerhard Wiesinger wrote:
> >[...]
> >>Why does the kernel prefer to swapin/out and not use
> >>
> >>a.) the free memory?
> >It will use all the free memory up to min watermark which is set up
> >based on min_free_kbytes.
>
> Makes sense, how is /proc/sys/vm/min_free_kbytes default value calculated?
See init_per_zone_wmark_min
> >>b.) the buffer/cache?
> >the memory reclaim is strongly biased towards page cache and we try to
> >avoid swapout as much as possible (see get_scan_count).
>
> If I understand it correctly, swapping is preferred over dropping the
> cache, right. Can this behaviour be changed to prefer dropping the
> cache to some minimum amount? Is this also configurable in a way?
No, we enforce swapping if the amount of free + file pages are below the
cumulative high watermark.
> (As far as I remember e.g. kernel 2.4 dropped the caches well).
>
> >>There is ~100M memory available but kernel swaps all the time ...
> >>
> >>Any ideas?
> >>
> >>Kernel: 4.9.14-200.fc25.x86_64
> >>
> >>top - 17:33:43 up 28 min, 3 users, load average: 3.58, 1.67, 0.89
> >>Tasks: 145 total, 4 running, 141 sleeping, 0 stopped, 0 zombie
> >>%Cpu(s): 19.1 us, 56.2 sy, 0.0 ni, 4.3 id, 13.4 wa, 2.0 hi, 0.3 si, 4.7
> >>st
> >>KiB Mem : 230076 total, 61508 free, 123472 used, 45096 buff/cache
> >>
> >>procs -----------memory---------- ---swap-- -----io---- -system--
> >>------cpu-----
> >> r b swpd free buff cache si so bi bo in cs us sy id wa st
> >> 3 5 303916 60372 328 43864 27828 200 41420 236 6984 11138 11 47 6 23 14
> >I am really surprised to see any reclaim at all. 26% of free memory
> >doesn't sound as if we should do a reclaim at all. Do you have an
> >unusual configuration of /proc/sys/vm/min_free_kbytes ? Or is there
> >anything running inside a memory cgroup with a small limit?
>
> nothing special set regarding /proc/sys/vm/min_free_kbytes (default values),
> detailed config below. Regarding cgroups, none of I know. How to check (I
> guess nothing is set because cg* commands are not available)?
be careful because systemd started to use some controllers. You can
easily check cgroup mount points.
> /proc/sys/vm/min_free_kbytes
> 45056
So at least 45M will be kept reserved for the system. Your data
indicated you had more memory. How does /proc/zoneinfo look like?
Btw. you seem to be using fc kernel, are there any patches applied on
top of Linus tree? Could you try to retest vanilla kernel?
--
Michal Hocko
SUSE Labs
On 2017/03/19 17:17, Gerhard Wiesinger wrote:
> On 17.03.2017 21:08, Gerhard Wiesinger wrote:
>> On 17.03.2017 18:13, Michal Hocko wrote:
>>> On Fri 17-03-17 17:37:48, Gerhard Wiesinger wrote:
>>> [...]
>
> 4.11.0-0.rc2.git4.1.fc27.x86_64
>
> There are also lockups after some runtime hours to 1 day:
> Message from syslogd@myserver Mar 19 08:22:33 ...
> kernel:BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 18717s!
>
> Message from syslogd@myserver at Mar 19 08:22:33 ...
> kernel:BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 18078s!
>
> repeated a lot of times ....
>
> Ciao,
> Gerhard
"kernel:BUG: workqueue lockup" lines alone do not help. It does not tell what work is
stalling. Maybe stalling due to constant swapping while doing memory allocation when
processing some work, but relevant lines are needed in order to know what is happening.
You can try SysRq-t to dump what workqueue threads are doing when you encounter such lines.
You might want to try kmallocwd at
http://lkml.kernel.org/r/1489578541-81526-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp .
On Sun, 2017-03-19 at 17:02 +0100, Gerhard Wiesinger wrote:
> mount | grep cgroup
Just because controllers are mounted doesn't mean they're populated. To
check that, you want to look for directories under the mount points
with a non-empty 'tasks'. You will find some, but memory cgroup
assignments would likely be most interesting for this thread. You can
eliminate any diddling there by booting with cgroup_disable=memory.
-Mike
On 20.03.2017 04:05, Mike Galbraith wrote:
> On Sun, 2017-03-19 at 17:02 +0100, Gerhard Wiesinger wrote:
>
>> mount | grep cgroup
> Just because controllers are mounted doesn't mean they're populated. To
> check that, you want to look for directories under the mount points
> with a non-empty 'tasks'. You will find some, but memory cgroup
> assignments would likely be most interesting for this thread. You can
> eliminate any diddling there by booting with cgroup_disable=memory.
>
Is this the correct information?
mount | grep "type cgroup" | cut -f 3 -d ' ' | while read LINE; do echo
"================================================================================================================================================================";echo
${LINE};ls -l ${LINE}; done
================================================================================================================================================================
/sys/fs/cgroup/systemd
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
drwxr-xr-x 2 root root 0 Mar 20 14:31 init.scope
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
drwxr-xr-x 60 root root 0 Mar 21 06:50 system.slice
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
drwxr-xr-x 4 root root 0 Mar 21 06:55 user.slice
================================================================================================================================================================
/sys/fs/cgroup/net_cls,net_prio
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
-rw-r--r-- 1 root root 0 Mar 20 14:31 net_cls.classid
-rw-r--r-- 1 root root 0 Mar 20 14:31 net_prio.ifpriomap
-r--r--r-- 1 root root 0 Mar 20 14:31 net_prio.prioidx
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
================================================================================================================================================================
/sys/fs/cgroup/cpu,cpuacct
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuacct.stat
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuacct.usage
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuacct.usage_all
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuacct.usage_percpu
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuacct.usage_percpu_sys
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuacct.usage_percpu_user
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuacct.usage_sys
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuacct.usage_user
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpu.cfs_period_us
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpu.cfs_quota_us
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpu.shares
-r--r--r-- 1 root root 0 Mar 20 14:31 cpu.stat
drwxr-xr-x 2 root root 0 Mar 20 14:31 init.scope
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
drwxr-xr-x 2 root root 0 Mar 20 14:31 system.slice
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
drwxr-xr-x 4 root root 0 Mar 21 06:55 user.slice
================================================================================================================================================================
/sys/fs/cgroup/devices
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
--w------- 1 root root 0 Mar 20 14:31 devices.allow
--w------- 1 root root 0 Mar 20 14:31 devices.deny
-r--r--r-- 1 root root 0 Mar 20 14:31 devices.list
drwxr-xr-x 2 root root 0 Mar 20 14:31 init.scope
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
drwxr-xr-x 60 root root 0 Mar 21 06:50 system.slice
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
drwxr-xr-x 4 root root 0 Mar 21 06:55 user.slice
================================================================================================================================================================
/sys/fs/cgroup/freezer
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
================================================================================================================================================================
/sys/fs/cgroup/perf_event
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
================================================================================================================================================================
/sys/fs/cgroup/cpuset
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.cpu_exclusive
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.cpus
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuset.effective_cpus
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuset.effective_mems
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.mem_exclusive
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.mem_hardwall
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.memory_migrate
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuset.memory_pressure
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.memory_pressure_enabled
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.memory_spread_page
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.memory_spread_slab
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.mems
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.sched_load_balance
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.sched_relax_domain_level
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
================================================================================================================================================================
/sys/fs/cgroup/memory
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
--w--w--w- 1 root root 0 Mar 20 14:31 cgroup.event_control
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
drwxr-xr-x 2 root root 0 Mar 20 14:31 init.scope
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.failcnt
--w------- 1 root root 0 Mar 20 14:31 memory.force_empty
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.failcnt
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.limit_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.max_usage_in_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.slabinfo
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.tcp.failcnt
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.tcp.limit_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.tcp.max_usage_in_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.tcp.usage_in_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.usage_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.limit_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.max_usage_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.memsw.failcnt
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.memsw.limit_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.memsw.max_usage_in_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 memory.memsw.usage_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.move_charge_at_immigrate
-r--r--r-- 1 root root 0 Mar 20 14:31 memory.numa_stat
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.oom_control
---------- 1 root root 0 Mar 20 14:31 memory.pressure_level
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.soft_limit_in_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 memory.stat
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.swappiness
-r--r--r-- 1 root root 0 Mar 20 14:31 memory.usage_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.use_hierarchy
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
drwxr-xr-x 2 root root 0 Mar 20 14:31 system.slice
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
drwxr-xr-x 4 root root 0 Mar 21 06:55 user.slice
================================================================================================================================================================
/sys/fs/cgroup/pids
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
drwxr-xr-x 2 root root 0 Mar 20 14:31 init.scope
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
drwxr-xr-x 60 root root 0 Mar 21 06:50 system.slice
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
drwxr-xr-x 4 root root 0 Mar 21 06:55 user.slice
================================================================================================================================================================
/sys/fs/cgroup/hugetlb
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
-rw-r--r-- 1 root root 0 Mar 20 14:31 hugetlb.2MB.failcnt
-rw-r--r-- 1 root root 0 Mar 20 14:31 hugetlb.2MB.limit_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 hugetlb.2MB.max_usage_in_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 hugetlb.2MB.usage_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
================================================================================================================================================================
/sys/fs/cgroup/blkio
total 0
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.avg_queue_size
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.dequeue
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.empty_time
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.group_wait_time
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.idle_time
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_merged
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_merged_recursive
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_queued
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_queued_recursive
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_service_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_service_bytes_recursive
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_serviced
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_serviced_recursive
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_service_time
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_service_time_recursive
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_wait_time
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_wait_time_recursive
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.leaf_weight
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.leaf_weight_device
--w------- 1 root root 0 Mar 20 14:31 blkio.reset_stats
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.sectors
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.sectors_recursive
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.throttle.io_service_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.throttle.io_serviced
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.throttle.read_bps_device
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.throttle.read_iops_device
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.throttle.write_bps_device
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.throttle.write_iops_device
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.time
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.time_recursive
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.unaccounted_time
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.weight
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.weight_device
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
drwxr-xr-x 2 root root 0 Mar 20 14:31 init.scope
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
drwxr-xr-x 2 root root 0 Mar 20 14:31 system.slice
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
drwxr-xr-x 4 root root 0 Mar 21 06:55 user.slice
Thnx.
Ciao,
Gerhard
On Tue, 2017-03-21 at 06:59 +0100, Gerhard Wiesinger wrote:
> Is this the correct information?
Incomplete, but enough to reiterate cgroup_disable=memory suggestion.
-Mike
On 21.03.2017 08:13, Mike Galbraith wrote:
> On Tue, 2017-03-21 at 06:59 +0100, Gerhard Wiesinger wrote:
>
>> Is this the correct information?
> Incomplete, but enough to reiterate cgroup_disable=memory suggestion.
>
How to collect complete information?
Thnx.
Ciao,
Gerhard
On Thu, 2017-03-23 at 08:16 +0100, Gerhard Wiesinger wrote:
> On 21.03.2017 08:13, Mike Galbraith wrote:
> > On Tue, 2017-03-21 at 06:59 +0100, Gerhard Wiesinger wrote:
> >
> > > Is this the correct information?
> > Incomplete, but enough to reiterate cgroup_disable=memory
> > suggestion.
> >
>
> How to collect complete information?
If Michal wants specifics, I suspect he'll ask. I posted only to pass
along a speck of information, and offer a test suggestion.. twice.
-Mike
On 2017/03/23 17:38, Mike Galbraith wrote:
> On Thu, 2017-03-23 at 08:16 +0100, Gerhard Wiesinger wrote:
>> On 21.03.2017 08:13, Mike Galbraith wrote:
>>> On Tue, 2017-03-21 at 06:59 +0100, Gerhard Wiesinger wrote:
>>>
>>>> Is this the correct information?
>>> Incomplete, but enough to reiterate cgroup_disable=memory
>>> suggestion.
>>>
>>
>> How to collect complete information?
>
> If Michal wants specifics, I suspect he'll ask. I posted only to pass
> along a speck of information, and offer a test suggestion.. twice.
>
> -Mike
Isn't information Mike asked something like output from below command
for i in `find /sys/fs/cgroup/memory/ -type f`; do echo ========== $i ==========; cat $i | xargs echo; done
and check which cgroups stalling tasks belong to? Also, Mike suggested to
reproduce your problem with cgroup_disable=memory kernel command line option
in order to bisect whether memory cgroups are related to your problem.
I don't know whether Michal already knows specific information to collect.
I think memory allocation watchdog might give us some clue. It will give us
output like http://I-love.SAKURA.ne.jp/tmp/serial-20170321.txt.xz .
Can you afford building kernels with watchdog patch applied? Steps I tried for
building kernels are shown below. (If you can't afford building but can afford
trying binary rpms, I can upload them.)
----------------------------------------
yum -y install yum-utils
wget https://dl.fedoraproject.org/pub/alt/rawhide-kernel-nodebug/SRPMS/kernel-4.11.0-0.rc3.git0.1.fc27.src.rpm
yum-builddep -y kernel-4.11.0-0.rc3.git0.1.fc27.src.rpm
rpm -ivh kernel-4.11.0-0.rc3.git0.1.fc27.src.rpm
yum-builddep -y ~/rpmbuild/SPECS/kernel.spec
patch -p1 -d ~/rpmbuild/SPECS/ << "EOF"
--- a/kernel.spec
+++ b/kernel.spec
@@ -24,7 +24,7 @@
%global zipsed -e 's/\.ko$/\.ko.xz/'
%endif
-# define buildid .local
+%define buildid .kmallocwd
# baserelease defines which build revision of this kernel version we're
# building. We used to call this fedora_build, but the magical name
@@ -1207,6 +1207,8 @@
git am %{patches}
+patch -p1 < $RPM_SOURCE_DIR/kmallocwd.patch
+
# END OF PATCH APPLICATIONS
# Any further pre-build tree manipulations happen here.
@@ -1243,6 +1245,8 @@
do
cat $i > temp-$i
mv $i .config
+ echo 'CONFIG_DETECT_MEMALLOC_STALL_TASK=y' >> .config
+ echo 'CONFIG_DEFAULT_MEMALLOC_TASK_TIMEOUT=30' >> .config
Arch=`head -1 .config | cut -b 3-`
make ARCH=$Arch listnewconfig | grep -E '^CONFIG_' >.newoptions || true
%if %{listnewconfig_fail}
EOF
wget -O ~/rpmbuild/SOURCES/kmallocwd.patch 'https://marc.info/?l=linux-mm&m=148957858821214&q=raw'
rpmbuild -bb ~/rpmbuild/SPECS/kernel.spec
----------------------------------------
On 17.03.2017 18:13, Michal Hocko wrote:
> On Fri 17-03-17 17:37:48, Gerhard Wiesinger wrote:
> [...]
>> Why does the kernel prefer to swapin/out and not use
>>
>> a.) the free memory?
> It will use all the free memory up to min watermark which is set up
> based on min_free_kbytes.
Makes sense, how is /proc/sys/vm/min_free_kbytes default value calculated?
>
>> b.) the buffer/cache?
> the memory reclaim is strongly biased towards page cache and we try to
> avoid swapout as much as possible (see get_scan_count).
If I understand it correctly, swapping is preferred over dropping the
cache, right. Can this behaviour be changed to prefer dropping the cache
to some minimum amount?
Is this also configurable in a way?
(As far as I remember e.g. kernel 2.4 dropped the caches well).
>
>> There is ~100M memory available but kernel swaps all the time ...
>>
>> Any ideas?
>>
>> Kernel: 4.9.14-200.fc25.x86_64
>>
>> top - 17:33:43 up 28 min, 3 users, load average: 3.58, 1.67, 0.89
>> Tasks: 145 total, 4 running, 141 sleeping, 0 stopped, 0 zombie
>> %Cpu(s): 19.1 us, 56.2 sy, 0.0 ni, 4.3 id, 13.4 wa, 2.0 hi, 0.3 si, 4.7
>> st
>> KiB Mem : 230076 total, 61508 free, 123472 used, 45096 buff/cache
>>
>> procs -----------memory---------- ---swap-- -----io---- -system--
>> ------cpu-----
>> r b swpd free buff cache si so bi bo in cs us sy id wa st
>> 3 5 303916 60372 328 43864 27828 200 41420 236 6984 11138 11 47 6 23 14
> I am really surprised to see any reclaim at all. 26% of free memory
> doesn't sound as if we should do a reclaim at all. Do you have an
> unusual configuration of /proc/sys/vm/min_free_kbytes ? Or is there
> anything running inside a memory cgroup with a small limit?
nothing special set regarding /proc/sys/vm/min_free_kbytes (default
values), detailed config below. Regarding cgroups, none of I know. How
to check (I guess nothing is set because cg* commands are not available)?
cat /etc/sysctl.d/* | grep "^vm"
vm.dirty_background_ratio = 3
vm.dirty_ratio = 15
vm.overcommit_memory = 2
vm.overcommit_ratio = 80
vm.swappiness=10
find /proc/sys/vm -type f -exec echo {} \; -exec cat {} \;
/proc/sys/vm/admin_reserve_kbytes
8192
/proc/sys/vm/block_dump
0
/proc/sys/vm/compact_memory
cat: /proc/sys/vm/compact_memory: Permission denied
/proc/sys/vm/compact_unevictable_allowed
1
/proc/sys/vm/dirty_background_bytes
0
/proc/sys/vm/dirty_background_ratio
3
/proc/sys/vm/dirty_bytes
0
/proc/sys/vm/dirty_expire_centisecs
3000
/proc/sys/vm/dirty_ratio
15
/proc/sys/vm/dirty_writeback_centisecs
500
/proc/sys/vm/dirtytime_expire_seconds
43200
/proc/sys/vm/drop_caches
0
/proc/sys/vm/extfrag_threshold
500
/proc/sys/vm/hugepages_treat_as_movable
0
/proc/sys/vm/hugetlb_shm_group
0
/proc/sys/vm/laptop_mode
0
/proc/sys/vm/legacy_va_layout
0
/proc/sys/vm/lowmem_reserve_ratio
256 256 32 1
/proc/sys/vm/max_map_count
65530
/proc/sys/vm/memory_failure_early_kill
0
/proc/sys/vm/memory_failure_recovery
1
/proc/sys/vm/min_free_kbytes
45056
/proc/sys/vm/min_slab_ratio
5
/proc/sys/vm/min_unmapped_ratio
1
/proc/sys/vm/mmap_min_addr
65536
/proc/sys/vm/mmap_rnd_bits
28
/proc/sys/vm/mmap_rnd_compat_bits
8
/proc/sys/vm/nr_hugepages
0
/proc/sys/vm/nr_hugepages_mempolicy
0
/proc/sys/vm/nr_overcommit_hugepages
0
/proc/sys/vm/nr_pdflush_threads
0
/proc/sys/vm/numa_zonelist_order
default
/proc/sys/vm/oom_dump_tasks
1
/proc/sys/vm/oom_kill_allocating_task
0
/proc/sys/vm/overcommit_kbytes
0
/proc/sys/vm/overcommit_memory
2
/proc/sys/vm/overcommit_ratio
80
/proc/sys/vm/page-cluster
3
/proc/sys/vm/panic_on_oom
0
/proc/sys/vm/percpu_pagelist_fraction
0
/proc/sys/vm/stat_interval
1
/proc/sys/vm/stat_refresh
/proc/sys/vm/swappiness
10
/proc/sys/vm/user_reserve_kbytes
31036
/proc/sys/vm/vfs_cache_pressure
100
/proc/sys/vm/watermark_scale_factor
10
/proc/sys/vm/zone_reclaim_mode
0
Thnx.
Ciao,
Gerhard
On 17.03.2017 21:08, Gerhard Wiesinger wrote:
> On 17.03.2017 18:13, Michal Hocko wrote:
>> On Fri 17-03-17 17:37:48, Gerhard Wiesinger wrote:
>> [...]
4.11.0-0.rc2.git4.1.fc27.x86_64
There are also lockups after some runtime hours to 1 day:
Message from syslogd@myserver Mar 19 08:22:33 ...
kernel:BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0
stuck for 18717s!
Message from syslogd@myserver at Mar 19 08:22:33 ...
kernel:BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0
stuck for 18078s!
repeated a lot of times ....
Ciao,
Gerhard
On 19.03.2017 16:18, Michal Hocko wrote:
> On Fri 17-03-17 21:08:31, Gerhard Wiesinger wrote:
>> On 17.03.2017 18:13, Michal Hocko wrote:
>>> On Fri 17-03-17 17:37:48, Gerhard Wiesinger wrote:
>>> [...]
>>>> Why does the kernel prefer to swapin/out and not use
>>>>
>>>> a.) the free memory?
>>> It will use all the free memory up to min watermark which is set up
>>> based on min_free_kbytes.
>> Makes sense, how is /proc/sys/vm/min_free_kbytes default value calculated?
> See init_per_zone_wmark_min
>
>>>> b.) the buffer/cache?
>>> the memory reclaim is strongly biased towards page cache and we try to
>>> avoid swapout as much as possible (see get_scan_count).
>> If I understand it correctly, swapping is preferred over dropping the
>> cache, right. Can this behaviour be changed to prefer dropping the
>> cache to some minimum amount? Is this also configurable in a way?
> No, we enforce swapping if the amount of free + file pages are below the
> cumulative high watermark.
>
>> (As far as I remember e.g. kernel 2.4 dropped the caches well).
>>
>>>> There is ~100M memory available but kernel swaps all the time ...
>>>>
>>>> Any ideas?
>>>>
>>>> Kernel: 4.9.14-200.fc25.x86_64
>>>>
>>>> top - 17:33:43 up 28 min, 3 users, load average: 3.58, 1.67, 0.89
>>>> Tasks: 145 total, 4 running, 141 sleeping, 0 stopped, 0 zombie
>>>> %Cpu(s): 19.1 us, 56.2 sy, 0.0 ni, 4.3 id, 13.4 wa, 2.0 hi, 0.3 si, 4.7
>>>> st
>>>> KiB Mem : 230076 total, 61508 free, 123472 used, 45096 buff/cache
>>>>
>>>> procs -----------memory---------- ---swap-- -----io---- -system--
>>>> ------cpu-----
>>>> r b swpd free buff cache si so bi bo in cs us sy id wa st
>>>> 3 5 303916 60372 328 43864 27828 200 41420 236 6984 11138 11 47 6 23 14
>>> I am really surprised to see any reclaim at all. 26% of free memory
>>> doesn't sound as if we should do a reclaim at all. Do you have an
>>> unusual configuration of /proc/sys/vm/min_free_kbytes ? Or is there
>>> anything running inside a memory cgroup with a small limit?
>> nothing special set regarding /proc/sys/vm/min_free_kbytes (default values),
>> detailed config below. Regarding cgroups, none of I know. How to check (I
>> guess nothing is set because cg* commands are not available)?
> be careful because systemd started to use some controllers. You can
> easily check cgroup mount points.
See below.
>
>> /proc/sys/vm/min_free_kbytes
>> 45056
> So at least 45M will be kept reserved for the system. Your data
> indicated you had more memory. How does /proc/zoneinfo look like?
> Btw. you seem to be using fc kernel, are there any patches applied on
> top of Linus tree? Could you try to retest vanilla kernel?
System looks normally now, FYI (e.g. now permanent swapping)
free
total used free shared buff/cache
available
Mem: 349076 154112 41560 184 153404 148716
Swap: 2064380 831844 1232536
cat /proc/zoneinfo
Node 0, zone DMA
per-node stats
nr_inactive_anon 9543
nr_active_anon 22105
nr_inactive_file 9877
nr_active_file 13416
nr_unevictable 0
nr_isolated_anon 0
nr_isolated_file 0
nr_pages_scanned 0
workingset_refault 1926013
workingset_activate 707166
workingset_nodereclaim 187276
nr_anon_pages 11429
nr_mapped 6852
nr_file_pages 46772
nr_dirty 1
nr_writeback 0
nr_writeback_temp 0
nr_shmem 46
nr_shmem_hugepages 0
nr_shmem_pmdmapped 0
nr_anon_transparent_hugepages 0
nr_unstable 0
nr_vmscan_write 3319047
nr_vmscan_immediate_reclaim 32363
nr_dirtied 222115
nr_written 3537529
pages free 3110
min 27
low 33
high 39
node_scanned 0
spanned 4095
present 3998
managed 3977
nr_free_pages 3110
nr_zone_inactive_anon 18
nr_zone_active_anon 3
nr_zone_inactive_file 51
nr_zone_active_file 75
nr_zone_unevictable 0
nr_zone_write_pending 0
nr_mlock 0
nr_slab_reclaimable 214
nr_slab_unreclaimable 289
nr_page_table_pages 185
nr_kernel_stack 16
nr_bounce 0
nr_zspages 0
numa_hit 1214071
numa_miss 0
numa_foreign 0
numa_interleave 0
numa_local 1214071
numa_other 0
nr_free_cma 0
protection: (0, 306, 306, 306, 306)
pagesets
cpu: 0
count: 0
high: 0
batch: 1
vm stats threshold: 4
cpu: 1
count: 0
high: 0
batch: 1
vm stats threshold: 4
node_unreclaimable: 0
start_pfn: 1
node_inactive_ratio: 0
Node 0, zone DMA32
pages free 7921
min 546
low 682
high 818
node_scanned 0
spanned 94172
present 94172
managed 83292
nr_free_pages 7921
nr_zone_inactive_anon 9525
nr_zone_active_anon 22102
nr_zone_inactive_file 9826
nr_zone_active_file 13341
nr_zone_unevictable 0
nr_zone_write_pending 1
nr_mlock 0
nr_slab_reclaimable 5829
nr_slab_unreclaimable 8622
nr_page_table_pages 2638
nr_kernel_stack 2208
nr_bounce 0
nr_zspages 0
numa_hit 23125334
numa_miss 0
numa_foreign 0
numa_interleave 14307
numa_local 23125334
numa_other 0
nr_free_cma 0
protection: (0, 0, 0, 0, 0)
pagesets
cpu: 0
count: 17
high: 90
batch: 15
vm stats threshold: 12
cpu: 1
count: 55
high: 90
batch: 15
vm stats threshold: 12
node_unreclaimable: 0
start_pfn: 4096
node_inactive_ratio: 0
mount | grep cgroup
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup
(rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/blkio type cgroup
(rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup
(rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/cpuset type cgroup
(rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup
(rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/hugetlb type cgroup
(rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/pids type cgroup
(rw,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/memory type cgroup
(rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/perf_event type cgroup
(rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/devices type cgroup
(rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup
(rw,nosuid,nodev,noexec,relatime,freezer)
There are patches (see below), but as far as I saw nothing regarding the
issues which happen.
BTW: Does it make sense to reduce lower limit for low mem VMs? e.g.
echo "10000" > /proc/sys/vm/min_free_kbytes
Thnx.
Ciao,
Gerhard
https://koji.fedoraproject.org/koji/buildinfo?buildID=870215
## Patches needed for building this package
# build tweak for build ID magic, even for -vanilla
Patch001: kbuild-AFTER_LINK.patch
## compile fixes
# ongoing complaint, full discussion delayed until ksummit/plumbers
Patch002: 0001-iio-Use-event-header-from-kernel-tree.patch
%if !%{nopatches}
# Git trees.
# Standalone patches
# a tempory patch for QCOM hardware enablement. Will be gone by end of
2016/F-26 GA
Patch420: qcom-QDF2432-tmp-errata.patch
# http://www.spinics.net/lists/arm-kernel/msg490981.html
Patch421: geekbox-v4-device-tree-support.patch
# http://www.spinics.net/lists/linux-tegra/msg26029.html
Patch422: usb-phy-tegra-Add-38.4MHz-clock-table-entry.patch
# Fix OMAP4 (pandaboard)
Patch423: arm-revert-mmc-omap_hsmmc-Use-dma_request_chan-for-reque.patch
# Not particularly happy we don't yet have a proper upstream resolution
this is the right direction
# https://www.spinics.net/lists/arm-kernel/msg535191.html
Patch424: arm64-mm-Fix-memmap-to-be-initialized-for-the-entire-section.patch
# http://patchwork.ozlabs.org/patch/587554/
Patch425: ARM-tegra-usb-no-reset.patch
Patch426: AllWinner-net-emac.patch
# http://www.spinics.net/lists/devicetree/msg163238.html
Patch430: bcm2837-initial-support.patch
# http://www.spinics.net/lists/dri-devel/msg132235.html
Patch433:
drm-vc4-Fix-OOPSes-from-trying-to-cache-a-partially-constructed-BO..patch
# bcm283x mmc for wifi
http://www.spinics.net/lists/arm-kernel/msg567077.html
Patch434: bcm283x-mmc-bcm2835.patch
# Upstream fixes for i2c/serial/ethernet MAC addresses
Patch435: bcm283x-fixes.patch
# https://lists.freedesktop.org/archives/dri-devel/2017-February/133823.html
Patch436: vc4-fix-vblank-cursor-update-issue.patch
# http://www.spinics.net/lists/arm-kernel/msg552554.html
Patch438: arm-imx6-hummingboard2.patch
Patch460: lib-cpumask-Make-CPUMASK_OFFSTACK-usable-without-deb.patch
Patch466: input-kill-stupid-messages.patch
Patch467: die-floppy-die.patch
Patch468: no-pcspkr-modalias.patch
Patch470: silence-fbcon-logo.patch
Patch471: Kbuild-Add-an-option-to-enable-GCC-VTA.patch
Patch472: crash-driver.patch
Patch473: efi-lockdown.patch
Patch487: Add-EFI-signature-data-types.patch
Patch488: Add-an-EFI-signature-blob-parser-and-key-loader.patch
# This doesn't apply. It seems like it could be replaced by
#
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c
# which has an explicit line about blacklisting
Patch489: KEYS-Add-a-system-blacklist-keyring.patch
Patch490: MODSIGN-Import-certificates-from-UEFI-Secure-Boot.patch
Patch491: MODSIGN-Support-not-importing-certs-from-db.patch
Patch493: drm-i915-hush-check-crtc-state.patch
Patch494: disable-i8042-check-on-apple-mac.patch
Patch495: lis3-improve-handling-of-null-rate.patch
Patch497: scsi-sd_revalidate_disk-prevent-NULL-ptr-deref.patch
Patch498: criu-no-expert.patch
Patch499: ath9k-rx-dma-stop-check.patch
Patch500: xen-pciback-Don-t-disable-PCI_COMMAND-on-PCI-device-.patch
Patch501: Input-synaptics-pin-3-touches-when-the-firmware-repo.patch
Patch502: firmware-Drop-WARN-from-usermodehelper_read_trylock-.patch
# Patch503: drm-i915-turn-off-wc-mmaps.patch
Patch509: MODSIGN-Don-t-try-secure-boot-if-EFI-runtime-is-disa.patch
#CVE-2016-3134 rhbz 1317383 1317384
Patch665: netfilter-x_tables-deal-with-bogus-nextoffset-values.patch
# grabbed from mailing list
Patch667:
v3-Revert-tty-serial-pl011-add-ttyAMA-for-matching-pl011-console.patch
# END OF PATCH DEFINITIONS
On 23.03.2017 09:38, Mike Galbraith wrote:
> On Thu, 2017-03-23 at 08:16 +0100, Gerhard Wiesinger wrote:
>> On 21.03.2017 08:13, Mike Galbraith wrote:
>>> On Tue, 2017-03-21 at 06:59 +0100, Gerhard Wiesinger wrote:
>>>
>>>> Is this the correct information?
>>> Incomplete, but enough to reiterate cgroup_disable=memory
>>> suggestion.
>>>
>> How to collect complete information?
> If Michal wants specifics, I suspect he'll ask. I posted only to pass
> along a speck of information, and offer a test suggestion.. twice.
Still OOM with cgroup_disable=memory, kernel
4.11.0-0.rc3.git0.2.fc26.x86_64,I set vm.min_free_kbytes = 10240 in
these tests.
# Full config
grep "vm\." /etc/sysctl.d/*
/etc/sysctl.d/00-dirty_background_ratio.conf:vm.dirty_background_ratio = 3
/etc/sysctl.d/00-dirty_ratio.conf:vm.dirty_ratio = 15
/etc/sysctl.d/00-kernel-vm-min-free-kbyzes.conf:vm.min_free_kbytes = 10240
/etc/sysctl.d/00-overcommit_memory.conf:vm.overcommit_memory = 2
/etc/sysctl.d/00-overcommit_ratio.conf:vm.overcommit_ratio = 80
/etc/sysctl.d/00-swappiness.conf:vm.swappiness=10
[31880.623557] sa1: page allocation stalls for 10942ms, order:0,
mode:0x14200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null)
[31880.623623] sa1 cpuset=/ mems_allowed=0
[31880.623630] CPU: 1 PID: 17112 Comm: sa1 Not tainted
4.11.0-0.rc3.git0.2.fc26.x86_64 #1
[31880.623724] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.9.3 04/01/2014
[31880.623819] Call Trace:
[31880.623893] dump_stack+0x63/0x84
[31880.623971] warn_alloc+0x10c/0x1b0
[31880.624046] __alloc_pages_slowpath+0x93d/0xe60
[31880.624142] ? get_page_from_freelist+0x122/0xbf0
[31880.624225] ? unmap_region+0xf7/0x130
[31880.624312] __alloc_pages_nodemask+0x290/0x2b0
[31880.624388] alloc_pages_vma+0xa0/0x2b0
[31880.624463] __handle_mm_fault+0x4d0/0x1160
[31880.624550] handle_mm_fault+0xb3/0x250
[31880.624628] __do_page_fault+0x23f/0x4c0
[31880.624701] trace_do_page_fault+0x41/0x120
[31880.624781] do_async_page_fault+0x51/0xa0
[31880.624866] async_page_fault+0x28/0x30
[31880.624941] RIP: 0033:0x7f9218d4914f
[31880.625032] RSP: 002b:00007ffe0d1376a8 EFLAGS: 00010206
[31880.625153] RAX: 00007f9218d2a314 RBX: 00007f9218f4e658 RCX:
00007f9218d2a354
[31880.625235] RDX: 00000000000005ec RSI: 0000000000000000 RDI:
00007f9218d2a314
[31880.625324] RBP: 00007ffe0d137950 R08: 00007f9218d2a900 R09:
0000000000027000
[31880.625423] R10: 00007ffe0d1376e0 R11: 00007f9218d2a900 R12:
0000000000000003
[31880.625505] R13: 00007ffe0d137a38 R14: 000000000000fd01 R15:
0000000000000002
[31880.625688] Mem-Info:
[31880.625762] active_anon:36671 inactive_anon:36711 isolated_anon:88
active_file:1399 inactive_file:1410 isolated_file:0
unevictable:0 dirty:5 writeback:15 unstable:0
slab_reclaimable:3099 slab_unreclaimable:3558
mapped:2037 shmem:3 pagetables:3340 bounce:0
free:2972 free_pcp:102 free_cma:0
[31880.627334] Node 0 active_anon:146684kB inactive_anon:146816kB
active_file:5596kB inactive_file:5572kB unevictable:0kB
isolated(anon):368kB isolated(file):0kB mapped:8044kB dirty:20kB
writeback:136kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp:
12kB writeback_tmp:0kB unstable:0kB pages_scanned:82 all_unreclaimable? no
[31880.627606] Node 0 DMA free:1816kB min:440kB low:548kB high:656kB
active_anon:5636kB inactive_anon:6844kB active_file:132kB
inactive_file:148kB unevictable:0kB writepending:4kB present:15992kB
managed:15908kB mlocked:0kB slab_reclaimable:284kB
slab_unreclaimable:532kB kernel_stack:0kB pagetables:188kB bounce:0kB
free_pcp:0kB local_pcp:0kB free_cma:0kB
[31880.627883] lowmem_reserve[]: 0 327 327 327 327
[31880.627959] Node 0 DMA32 free:10072kB min:9796kB low:12244kB
high:14692kB active_anon:141048kB inactive_anon:140000kB
active_file:5432kB inactive_file:5444kB unevictable:0kB
writepending:152kB present:376688kB managed:353760kB mlocked:0kB
slab_reclaimable:12112kB slab_unreclaimable:13700kB kernel_stack:2464kB
pagetables:13172kB bounce:0kB free_pcp:504kB local_pcp:272kB free_cma:0kB
[31880.628334] lowmem_reserve[]: 0 0 0 0 0
[31880.629882] Node 0 DMA: 33*4kB (UME) 24*8kB (UM) 26*16kB (UME) 4*32kB
(UME) 5*64kB (UME) 1*128kB (E) 2*256kB (M) 0*512kB 0*1024kB 0*2048kB
0*4096kB = 1828kB
[31880.632255] Node 0 DMA32: 174*4kB (UMEH) 107*8kB (UMEH) 96*16kB
(UMEH) 59*32kB (UME) 30*64kB (UMEH) 8*128kB (UEH) 8*256kB (UMEH) 1*512kB
(E) 0*1024kB 0*2048kB 0*4096kB = 10480kB
[31880.634344] Node 0 hugepages_total=0 hugepages_free=0
hugepages_surp=0 hugepages_size=2048kB
[31880.634346] 7276 total pagecache pages
[31880.635277] 4367 pages in swap cache
[31880.636206] Swap cache stats: add 5639999, delete 5635551, find
6573228/8496821
[31880.637145] Free swap = 973736kB
[31880.638038] Total swap = 2064380kB
[31880.638988] 98170 pages RAM
[31880.640309] 0 pages HighMem/MovableOnly
[31880.641791] 5753 pages reserved
[31880.642908] 0 pages cma reserved
[31880.643978] 0 pages hwpoisoned
Will try your suggestions with the custom build kernel.
Ciao,
Gerhard