linux-kernel - Re: [patch 1/4] ipc: sem optimise undo list search

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Message-ID: <4A8806EB.8010703@colorfullife.com>
Date:	Sun, 16 Aug 2009 15:17:31 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	npiggin@...e.de
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Nadia Derbey <Nadia.Derbey@...l.net>,
	Pierre Peiffer <peifferp@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 1/4] ipc: sem optimise undo list search

On 08/11/2009 01:09 PM, npiggin@...e.de wrote:
> Move last looked up sem_undo struct to the head of the task's undo list.
> Attempt to move common entries to the front of the list so search time is
> reduced. This reduces lookup_undo on oprofile of problematic SAP workload
> by 30% (see patch 4 for a description of SAP workload).
>
> Signed-off-by: Nick Piggin<npiggin@...e.de>
>    
Signed-off-by: Manfred Spraul <manfred@...orfullife.com>

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