linux-kernel - Re: [RFC] Using "page credits" as a solution for common thrashing scenarios

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Message-ID: <AANLkTinO-roipX4Euj1R3AdxBbY3RZSJXjVtLIpwDWSK@mail.gmail.com>
Date:	Tue, 8 Jun 2010 12:45:26 +0300
From:	Eyal Lotem <eyal.lotem@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] Using "page credits" as a solution for common thrashing 
	scenarios

Replying to a very old email :-)

On Wed, Nov 25, 2009 at 12:15 AM, Andi Kleen <andi@...stfloor.org> wrote:
> Eyal Lotem <eyal.lotem@...il.com> writes:
>
> Replying to an old email.
>
>>   * I think it is wrong for the kernel to evict the 15 pages of the bash,
>>     xterm, X server's working set, as an example, in order for a
>>     misbehaving process to have 1000015 instead of 1000000 pages in its
>>     working set. EVEN if that misbehaving process is accessing its working
>>     set far more aggressively.
>
> One problem in practice tends to be that it's hard to realiably detect
> that a process is misbehaving. The 1000000 page process might be your
> critical database, while the 15 page process is something very
> unimportant.

Well, this solution doesn't really depend on any detection of
"misbehaving", it just goes about a more accurate way of defining page
importance.  A simple solution to the problem you suggest is assigning
far more "credits" to the database than to the 15-page process.

Eyal

>
> -Andi
>
> --
> ak@...ux.intel.com -- Speaking for myself only.
>
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