Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value

[vinayak menon]

On Thu, Nov 26, 2015 at 7:26 AM, Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> wrote:
> On Wed, Nov 25, 2015 at 01:00:22PM +0100, Michal Hocko wrote:
>> On Tue 24-11-15 15:22:03, Joonsoo Kim wrote:
>> > When I tested compaction in low memory condition, I found that
>> > my benchmark is stuck in congestion_wait() at shrink_inactive_list().
>> > This stuck last for 1 sec and after then it can escape. More investigation
>> > shows that it is due to stale vmstat value. vmstat is updated every 1 sec
>> > so it is stuck for 1 sec.
>>
>> Wouldn't it be sufficient to use zone_page_state_snapshot in
>> too_many_isolated?
>
This was done by this patch I believe,
http://lkml.iu.edu/hypermail/linux/kernel/1501.2/00001.html, though
the original  issue (wait of more than 1 sec) was fixed by the vmstat
changes.
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