linux-kernel - Re: How to get a sense of VM pressure

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Message-Id: <200807271643.32338.rusty@rustcorp.com.au>
Date:	Sun, 27 Jul 2008 16:43:31 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	virtualization@...ts.linux-foundation.org
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: How to get a sense of VM pressure

On Saturday 26 July 2008 03:55:36 Jeremy Fitzhardinge wrote:
> So I guess what I need is some measurement of "memory use" which is
> perhaps akin to a system-wide RSS; a measure of the number of pages
> being actively used, that if non-resident would cause a large amount of
> paging.  If you shrink the domain down to that number of pages + some
> padding (x%?), then the system will run happily in a stable state.  If
> that number increases, then the system will need new memory soon, to
> stop it from thrashing.  And if that number goes way below the domain's
> actual memory allocation, then it has "too much" memory.

Like everyone, I've thought about this.  The shrinker callbacks seem like a 
candidate here; have you played with them at all?

Some dynamic tension between the shrinker callback and slow feed of pages to 
the balloon seems like it should work...

Rusty.
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