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

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Message-ID: <alpine.DEB.2.20.1511051144240.28554@east.gentwo.org>
Date:	Thu, 5 Nov 2015 11:45:42 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
cc:	mhocko@...nel.org, htejun@...il.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

On Thu, 5 Nov 2015, Tetsuo Handa wrote:

> memory allocation. By allowing workqueue items to be processed (by using
> short sleep), some task might release memory when workqueue item is
> processed.
>
> Therefore, not only to keep vmstat counters up to date, but also for
> avoid wasting CPU cycles, I prefer a short sleep.

Sorry but we need work queue processing for vmstat counters that is
independent of other requests submitted that may block. Adding points
where we sleep / schedule everywhere to do this is not the right approach.

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