linux-kernel - Re: [PATCH v2 09/13] rwsem: skip initial trylock in rwsem_down_write

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Message-ID: <5154B322.90705@redhat.com>
Date:	Thu, 28 Mar 2013 17:16:18 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Michel Lespinasse <walken@...gle.com>
CC:	Alex Shi <alex.shi@...el.com>, Ingo Molnar <mingo@...nel.org>,
	David Howells <dhowells@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>,
	Peter Hurley <peter@...leysoftware.com>,
	Dave Chinner <david@...morbit.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 09/13] rwsem: skip initial trylock in rwsem_down_write_failed

On 03/15/2013 06:54 AM, Michel Lespinasse wrote:
> We can skip the initial trylock in rwsem_down_write_failed() if there are
> known active lockers already, thus saving one likely-to-fail cmpxchg.
>
> Signed-off-by: Michel Lespinasse <walken@...gle.com>

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


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