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

From	vinayak menon <vinayakm.list@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value
Date	2015-11-26 06:10 +0100
Message-ID	<qyWYF-8v8-7@gated-at.bofh.it> (permalink)
References	<qyfh0-4q8-7@gated-at.bofh.it> <qyH3A-67h-29@gated-at.bofh.it> <qyU0O-5R8-15@gated-at.bofh.it>
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On Thu, Nov 26, 2015 at 7:26 AM, Joonsoo Kim <iamjoonsoo.kim@lge.com> 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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Thread

[PATCH] mm/vmstat: retrieve more accurate vmstat value Joonsoo Kim <js1304@gmail.com> - 2015-11-24 07:30 +0100
  Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value Christoph Lameter <cl@linux.com> - 2015-11-24 16:40 +0100
    Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value Joonsoo Kim <iamjoonsoo.kim@lge.com> - 2015-11-25 04:00 +0100
      Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value Christoph Lameter <cl@linux.com> - 2015-11-25 17:10 +0100
        Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value Michal Hocko <mhocko@kernel.org> - 2015-11-25 19:10 +0100
          Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value Christoph Lameter <cl@linux.com> - 2015-11-25 19:30 +0100
        Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value Joonsoo Kim <iamjoonsoo.kim@lge.com> - 2015-11-26 03:00 +0100
  Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value Michal Hocko <mhocko@kernel.org> - 2015-11-25 13:10 +0100
    Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value Vlastimil Babka <vbabka@suse.cz> - 2015-11-25 14:50 +0100
      Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value Michal Hocko <mhocko@kernel.org> - 2015-11-25 14:50 +0100
    Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value Joonsoo Kim <iamjoonsoo.kim@lge.com> - 2015-11-26 03:00 +0100
      Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value vinayak menon <vinayakm.list@gmail.com> - 2015-11-26 06:10 +0100
      Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value Michal Hocko <mhocko@kernel.org> - 2015-11-26 16:10 +0100

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