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

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Message-ID: <20151022184226.GA19289@mtj.duckdns.org>
Date:	Fri, 23 Oct 2015 03:42:26 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Michal Hocko <mhocko@...nel.org>
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 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.

Thanks.

-- 
tejun
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