linux-kernel - Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value

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Message-ID: <alpine.DEB.2.20.1511251225060.432@east.gentwo.org>
Date:	Wed, 25 Nov 2015 12:26:10 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Michal Hocko <mhocko@...nel.org>
cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm/vmstat: retrieve more accurate vmstat value

On Wed, 25 Nov 2015, Michal Hocko wrote:

> > Simply remove the counter from the vmstat handling and do it differently
> > then.
>
> We definitely do not want yet another set of counters. vmstat counters
> are not only to be exported into the userspace. We have in kernel users
> as well. I do agree that there are users who can cope with some level of
> imprecision though and those which depend on the accuracy can use
> zone_page_state_snapshot which doesn't impose any overhead on others.
> [...]

Ok then the proper patch would be to use zone_page_state() instead of
zone_page_state() here instead of modifying zone_page_state().

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