linux-kernel - Re: [PATCH v2] vmpressure: implement strict mode

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Message-ID: <20130628005852.GA8093@teo>
Date:	Thu, 27 Jun 2013 17:58:53 -0700
From:	Anton Vorontsov <anton@...msg.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Minchan Kim <minchan@...nel.org>,
	Luiz Capitulino <lcapitulino@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, mhocko@...e.cz, kmpark@...radead.org,
	hyunhee.kim@...sung.com
Subject: Re: [PATCH v2] vmpressure: implement strict mode

On Thu, Jun 27, 2013 at 05:34:33PM -0700, Andrew Morton wrote:
> > If so, userland daemon would receive lots of events which are no interest.
> 
> "lots"?  If vmpressure is generating events at such a high frequency that
> this matters then it's already busted?

Current frequency is 1/(2MB). Suppose we ended up scanning the whole
memory on a 2GB host, this will give us 1024 hits. Doesn't feel too much*
to me... But for what it worth, I am against adding read() to the
interface -- just because we can avoid the unnecessary switch into the
kernel.

* For bigger hosts we should increase the window, as we do for the vmstat. 
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