linux-kernel - Re: [PATCH 2/2 v2] mm: allow to set overcommit ratio more precisely

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Message-ID: <20130905221140.GA29867@amd.pavel.ucw.cz>
Date:	Fri, 6 Sep 2013 00:11:40 +0200
From:	Pavel Machek <pavel@....cz>
To:	Jerome Marchand <jmarchan@...hat.com>
Cc:	Dave Hansen <dave.hansen@...el.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2 v2] mm: allow to set overcommit ratio more precisely

hi!

> >> This patch adds the new overcommit_ratio_ppm sysctl variable that
> >> allow to set overcommit ratio with a part per million precision.
> >> The old overcommit_ratio variable can still be used to set and read
> >> the ratio with a 1% precision. That way, overcommit_ratio interface
> >> isn't broken in any way that I can imagine.
> > 
> > Looks like a pretty sane solution.  Could you also make a Documentation/
> > update, please?
> 
> Damn! I forgot. Will do.

Actually... would something like overcommit_bytes be better interface? overcommit_pages?

If system would normally allow allocating "n" pages, with overcommit
it would allow allocating "n + overcommit_pages" pages. That seems
like right granularity...

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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