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Re: [PATCH v2] mm: fix condition for throttle_direct_reclaim

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On March 14, 2017 6:19 AM Shakeel Butt wrote: 
> 
> Recently kswapd has been modified to give up after MAX_RECLAIM_RETRIES
> number of unsucessful iterations. Before going to sleep, kswapd thread
> will unconditionally wakeup all threads sleeping on pfmemalloc_wait.
> However the awoken threads will recheck the watermarks and wake the
> kswapd thread and sleep again on pfmemalloc_wait. There is a chance
> of continuous back and forth between kswapd and direct reclaiming
> threads if the kswapd keep failing and thus defeat the purpose of
> adding backoff mechanism to kswapd. So, add kswapd_failures check
> on the throttle_direct_reclaim condition.
> 
> Signed-off-by: Shakeel Butt <shakeelb@google.com>
> Suggested-by: Michal Hocko <mhocko@suse.com>
> Suggested-by: Johannes Weiner <hannes@cmpxchg.org>
> ---

Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>

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[PATCH v2] mm: fix condition for throttle_direct_reclaim Shakeel Butt <shakeelb@google.com> - 2017-03-13 23:30 +0100
  Re: [PATCH v2] mm: fix condition for throttle_direct_reclaim "Hillf Danton" <hillf.zj@alibaba-inc.com> - 2017-03-14 04:10 +0100
  Re: [PATCH v2] mm: fix condition for throttle_direct_reclaim Michal Hocko <mhocko@kernel.org> - 2017-03-14 09:20 +0100

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