linux-kernel - Re: [PATCH v2] mm: vmscan: fix the page state calculation in too_many

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Message-ID: <alpine.DEB.2.11.1501221010510.3937@gentwo.org>
Date:	Thu, 22 Jan 2015 10:11:31 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Michal Hocko <mhocko@...e.cz>
cc:	Vinayak Menon <vinmenon@...eaurora.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	hannes@...xchg.org, vdavydov@...allels.com, mgorman@...e.de,
	minchan@...nel.org
Subject: Re: [PATCH v2] mm: vmscan: fix the page state calculation in
 too_many_isolated

On Wed, 21 Jan 2015, Michal Hocko wrote:

> I think we can solve this as well. We can stick vmstat_shepherd into a
> kernel thread with a loop with the configured timeout and then create a
> mask of CPUs which need the update and run vmstat_update from
> IPI context (smp_call_function_many).

Please do not run the vmstat_updates concurrently. They update shared
cachelines and therefore can cause bouncing cachelines if run concurrently
on multiple cpus.
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