linux-kernel - Re: [patch 4/4] ipc: sem optimise simple operations

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Message-ID: <4A81B646.5060301@colorfullife.com>
Date:	Tue, 11 Aug 2009 20:19:50 +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 4/4] ipc: sem optimise simple operations

On 08/11/2009 01:09 PM, npiggin@...e.de wrote:
> Index: linux-2.6/include/linux/sem.h
> ===================================================================
> --- linux-2.6.orig/include/linux/sem.h
> +++ linux-2.6/include/linux/sem.h
> @@ -86,6 +86,8 @@ struct task_struct;
>   struct sem {
>   	int	semval;		/* current value */
>   	int	sempid;		/* pid of last operation */
> +	struct list_head	negv_pending;
> +	struct list_head	zero_pending;
>   };
>    
struct sem is increased from 8 to 24 bytes.
Is that still ok? Are there any apps that use really lots of semaphores 
(i.e.: far more than processes in the system?)

Postgres uses lots of small semaphore sets (each with 17 entries), I 
never had access to other apps.
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