linux-kernel - Re: [PATCH] mm,vmscan: Use accurate values for zone

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Date:	Thu, 22 Oct 2015 17:49:22 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Tejun Heo <htejun@...il.com>
Cc:	Christoph Lameter <cl@...ux.com>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org,
	David Rientjes <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

On Fri 23-10-15 00:37:03, Tejun Heo wrote:
> On Thu, Oct 22, 2015 at 05:35:59PM +0200, Michal Hocko wrote:
> > But that shouldn't happen because the allocation path does cond_resched
> > even when nothing is really reclaimable (e.g. wait_iff_congested from
> > __alloc_pages_slowpath).
> 
> cond_resched() isn't enough.  The work item should go !RUNNING, not
> just yielding.

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.
-- 
Michal Hocko
SUSE Labs
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