Hi Changsheng,
According to the following thread, Tang has no objection to change kernel
behavior since udev cannot online memory as movable.
https://lkml.org/lkml/2015/10/21/159
So how about reposting the v5 patch?
I have a comment about the patch. Please see below.
On Tue, 15 Sep 2015 03:49:58 -0400
Changsheng Liu <[email protected]> wrote:
> From: Changsheng Liu <[email protected]>
>
> After the user config CONFIG_MOVABLE_NODE and movable_node kernel option,
> When the memory is hot added, should_add_memory_movable() return 0
> because all zones including movable zone are empty,
> so the memory that was hot added will be added to the normal zone
> and the normal zone will be created firstly.
> But we want the whole node to be added to movable zone defaultly.
>
> So we change should_add_memory_movable(): if the user config
> CONFIG_MOVABLE_NODE and movable_node kernel option
> it will always return 1 and all zones is empty at the same time,
> so that the movable zone will be created firstly
> and then the whole node will be added to movable zone defaultly.
> If we want the node to be added to normal zone,
> we can do it as follows:
> "echo online_kernel > /sys/devices/system/memory/memoryXXX/state"
>
> Signed-off-by: Xiaofeng Yan <[email protected]>
> Signed-off-by: Changsheng Liu <[email protected]>
> Tested-by: Dongdong Fan <[email protected]>
> ---
> mm/memory_hotplug.c | 8 ++++++++
> 1 files changed, 8 insertions(+), 0 deletions(-)
>
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 26fbba7..d39dbb0 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1190,6 +1190,9 @@ static int check_hotplug_memory_range(u64 start, u64 size)
> /*
> * If movable zone has already been setup, newly added memory should be check.
> * If its address is higher than movable zone, it should be added as movable.
> + * And if system boots up with movable_node and config CONFIG_MOVABLE_NOD and
> + * added memory does not overlap the zone before MOVABLE_ZONE,
> + * the memory is added as movable
> * Without this check, movable zone may overlap with other zone.
> */
> static int should_add_memory_movable(int nid, u64 start, u64 size)
> @@ -1197,6 +1200,11 @@ static int should_add_memory_movable(int nid, u64 start, u64 size)
> unsigned long start_pfn = start >> PAGE_SHIFT;
> pg_data_t *pgdat = NODE_DATA(nid);
> struct zone *movable_zone = pgdat->node_zones + ZONE_MOVABLE;
> + struct zone *pre_zone = pgdat->node_zones + (ZONE_MOVABLE - 1);
> +
> + if (movable_node_is_enabled()
> + && zone_end_pfn(pre_zone) <= start_pfn)
> + return 1;
if (movable_node_is_enabled() && (zone_end_pfn(pre_zone) <= start_pfn))
Thanks,
Yasuaki Ishimatsu
>
> if (zone_is_empty(movable_zone))
> return 0;
> --
> 1.7.1
>
On 11/4 2015 0:13, Yasuaki Ishimatsu wrote:
> Hi Changsheng,
>
> According to the following thread, Tang has no objection to change kernel
> behavior since udev cannot online memory as movable.
>
> https://lkml.org/lkml/2015/10/21/159
>
> So how about reposting the v5 patch?
> I have a comment about the patch. Please see below.
Thanks,I will update the patch and repost it
> On Tue, 15 Sep 2015 03:49:58 -0400
> Changsheng Liu <[email protected]> wrote:
>
>> From: Changsheng Liu <[email protected]>
>>
>> After the user config CONFIG_MOVABLE_NODE and movable_node kernel option,
>> When the memory is hot added, should_add_memory_movable() return 0
>> because all zones including movable zone are empty,
>> so the memory that was hot added will be added to the normal zone
>> and the normal zone will be created firstly.
>> But we want the whole node to be added to movable zone defaultly.
>>
>> So we change should_add_memory_movable(): if the user config
>> CONFIG_MOVABLE_NODE and movable_node kernel option
>> it will always return 1 and all zones is empty at the same time,
>> so that the movable zone will be created firstly
>> and then the whole node will be added to movable zone defaultly.
>> If we want the node to be added to normal zone,
>> we can do it as follows:
>> "echo online_kernel > /sys/devices/system/memory/memoryXXX/state"
>>
>> Signed-off-by: Xiaofeng Yan <[email protected]>
>> Signed-off-by: Changsheng Liu <[email protected]>
>> Tested-by: Dongdong Fan <[email protected]>
>> ---
>> mm/memory_hotplug.c | 8 ++++++++
>> 1 files changed, 8 insertions(+), 0 deletions(-)
>>
>> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
>> index 26fbba7..d39dbb0 100644
>> --- a/mm/memory_hotplug.c
>> +++ b/mm/memory_hotplug.c
>> @@ -1190,6 +1190,9 @@ static int check_hotplug_memory_range(u64 start, u64 size)
>> /*
>> * If movable zone has already been setup, newly added memory should be check.
>> * If its address is higher than movable zone, it should be added as movable.
>> + * And if system boots up with movable_node and config CONFIG_MOVABLE_NOD and
>> + * added memory does not overlap the zone before MOVABLE_ZONE,
>> + * the memory is added as movable
>> * Without this check, movable zone may overlap with other zone.
>> */
>> static int should_add_memory_movable(int nid, u64 start, u64 size)
>> @@ -1197,6 +1200,11 @@ static int should_add_memory_movable(int nid, u64 start, u64 size)
>> unsigned long start_pfn = start >> PAGE_SHIFT;
>> pg_data_t *pgdat = NODE_DATA(nid);
>> struct zone *movable_zone = pgdat->node_zones + ZONE_MOVABLE;
>> + struct zone *pre_zone = pgdat->node_zones + (ZONE_MOVABLE - 1);
>> +
>> + if (movable_node_is_enabled()
>> + && zone_end_pfn(pre_zone) <= start_pfn)
>> + return 1;
> if (movable_node_is_enabled() && (zone_end_pfn(pre_zone) <= start_pfn))
>
> Thanks,
> Yasuaki Ishimatsu
>
>>
>> if (zone_is_empty(movable_zone))
>> return 0;
>> --
>> 1.7.1
>>
> .
>