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

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Message-ID: <87aaybwrny.fsf@basil.nowhere.org>
Date:	Tue, 24 Nov 2009 22:15:29 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eyal Lotem <eyal.lotem@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] Using "page credits" as a solution for common thrashing  scenarios

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.

-Andi

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