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Message-Id: <201510230642.HDF57807.QJtSOVFFOMLHOF@I-love.SAKURA.ne.jp> Date: Fri, 23 Oct 2015 06:42:43 +0900 From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> To: htejun@...il.com, mhocko@...nel.org Cc: cl@...ux.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org, rientjes@...gle.com, oleg@...hat.com, kwalker@...hat.com, akpm@...ux-foundation.org, hannes@...xchg.org, vdavydov@...allels.com, skozina@...hat.com, mgorman@...e.de, riel@...hat.com Subject: Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()checks Tejun Heo wrote: > On Thu, Oct 22, 2015 at 05:49:22PM +0200, Michal Hocko wrote: > > I am confused. What makes rescuer to not run? Nothing seems to be > > hogging CPUs, we are just out of workers which are loopin in the > > allocator but that is preemptible context. > > It's concurrency management. Workqueue thinks that the pool is making > positive forward progress and doesn't schedule anything else for > execution while that work item is burning cpu cycles. Then, isn't below change easier to backport which will also alleviate needlessly burning CPU cycles? --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3385,6 +3385,7 @@ retry: ((gfp_mask & __GFP_REPEAT) && pages_reclaimed < (1 << order))) { /* Wait for some write requests to complete then retry */ wait_iff_congested(ac->preferred_zone, BLK_RW_ASYNC, HZ/50); + schedule_timeout_uninterruptible(1); goto retry; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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