linux-kernel - Re: [PATCH 1/1] mlock: split the shmlock_user_lock spinlock into per user

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Message-ID: <4FA2C946.60006@redhat.com>
Date:	Thu, 03 May 2012 14:07:02 -0400
From:	Rik van Riel <riel@...hat.com>
To:	rajman mekaco <rajman.mekaco@...il.com>
CC:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Christoph Lameter <cl@...two.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/1] mlock: split the shmlock_user_lock spinlock into
 per user_struct spinlock

On 05/03/2012 01:34 PM, rajman mekaco wrote:
> The user_shm_lock and user_shm_unlock functions use a single global
> spinlock for protecting the user->locked_shm.
>
> This is an overhead for multiple CPUs calling this code even if they
> are having different user_struct.
>
> Remove the global shmlock_user_lock and introduce and use a new
> spinlock inside of the user_struct structure.
>
> Signed-off-by: rajman mekaco<rajman.mekaco@...il.com>

Reviewed-by: Rik van Riel <riel@...hat.com>

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