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

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Date:	Fri, 16 Jan 2015 13:17:46 -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 Fri, 16 Jan 2015, Michal Hocko wrote:

> On Fri 16-01-15 16:49:22, Michal Hocko wrote:
> [...]
> > Why cannot we simply update the global counters from vmstat_shepherd
> > directly?
>
> OK, I should have checked the updating paths... This would be racy, so
> update from remote is not an option without additional trickery (like
> retries etc.) :/

You can do that if you have a way to ensure that the other cpu does not
access the counter. F.e. if the other cpu is staying in user space all the
time or it is guaranteed to be idle.


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