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Date: Fri, 26 Jan 2024 16:31:45 -0800
From: "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>
To: Michal Hocko <mhocko@suse.com>
Cc: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>,
	"david@redhat.com" <david@redhat.com>,
	"quic_pkondeti@quicinc.com" <quic_pkondeti@quicinc.com>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"hannes@cmpxchg.org" <hannes@cmpxchg.org>,
	"mgorman@techsingularity.net" <mgorman@techsingularity.net>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"vbabka@suse.cz" <vbabka@suse.cz>,
	"quic_charante@quicinc.com" <quic_charante@quicinc.com>,
	"stable@vger.kernel.org" <stable@vger.kernel.org>,
	"quic_cgoldswo@quicinc.com" <quic_cgoldswo@quicinc.com>
Subject: Re: [RESEND PATCH V2] mm: page_alloc: unreserve highatomic page
 blocks before oom
Message-ID: <2024012635-stoneware-backboned-2ca0@gregkh>
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In-Reply-To: <Za-h5t7HX5rNrVdq@tiehlicka>

On Tue, Jan 23, 2024 at 12:24:22PM +0100, Michal Hocko wrote:
> On Tue 23-01-24 11:08:28, Joakim Tjernlund wrote:
> [...]
> > Mar  9 12:52:40 xr kern.warn kernel: [ 1066.001379] Mem-Info:
> > Mar  9 12:52:40 xr kern.warn kernel: [ 1066.003665] active_anon:18 inactive_anon:2435 isolated_anon:0
> > Mar  9 12:52:40 xr kern.warn kernel: [ 1066.003665]  active_file:1 inactive_file:0 isolated_file:0
> > Mar  9 12:52:40 xr kern.warn kernel: [ 1066.003665]  unevictable:267 dirty:0 writeback:0
> > Mar  9 12:52:40 xr kern.warn kernel: [ 1066.003665]  slab_reclaimable:384 slab_unreclaimable:2223
> > Mar  9 12:52:40 xr kern.warn kernel: [ 1066.003665]  mapped:1 shmem:0 pagetables:309 bounce:0
> > Mar  9 12:52:41 xr kern.warn kernel: [ 1066.003665]  kernel_misc_reclaimable:0
> > Mar  9 12:52:41 xr kern.warn kernel: [ 1066.003665]  free:1054 free_pcp:24 free_cma:0
> > Mar  9 12:52:41 xr kern.warn kernel: [ 1066.037938] Node 0 active_anon:72kB inactive_anon:9740kB active_file:4kB inactive_file:0kB unevictable:1068kB isolated(anon):0kB isolated(file):0kB mapped:4kB dirty:0kB writeback:0kB shmem:0kB writeback_tmp:0kB kernel_stack:9
> > Mar  9 12:52:41 xr kern.warn kernel: [ 1066.061723] Normal free:4216kB min:128kB low:160kB high:192kB reserved_highatomic:4096KB active_anon:72kB inactive_anon:9740kB active_file:4kB inactive_file:0kB unevictable:1068kB writepending:0kB present:36864kB managed:2944
> > Mar  9 12:52:41 xr kern.warn kernel: [ 1066.087595] lowmem_reserve[]: 0 0
> > Mar  9 12:52:41 xr kern.warn kernel: [ 1066.090918] Normal: 206*4kB (MEH) 198*8kB (UMEH) 79*16kB (UMEH) 13*32kB (H) 2*64kB (H) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 4216kB
> > Mar  9 12:52:41 xr kern.warn kernel: [ 1066.104104] 269 total pagecache pages
> > Mar  9 12:52:41 xr kern.warn kernel: [ 1066.107768] 9216 pages RAM
> 
> OK, so this is really a tiny system (36MB) and having 4MB in highatomic
> reserves is clearly too much. So this matches the patch you are
> referencing and it migh help you indeed.

Ok, now queued up, thanks.

greg k-h