linux-kernel - Re: [PATCH 1/2] rwsem: add rwsem_is

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Message-ID: <20130926141606.GA32444@gmail.com>
Date:	Thu, 26 Sep 2013 16:16:06 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Josef Bacik <jbacik@...ionio.com>
Cc:	linux-btrfs@...r.kernel.org, walken@...gle.com,
	linux-kernel@...r.kernel.org, peter@...leysoftware.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 1/2] rwsem: add rwsem_is_contended V3


* Josef Bacik <jbacik@...ionio.com> wrote:

> Btrfs needs a simple way to know if it needs to let go of it's read lock on a
> rwsem.  Introduce rwsem_is_contended to check to see if there are any waiters on
> this rwsem currently.  This is just a hueristic, it is meant to be light and not
> 100% accurate and called by somebody already holding on to the rwsem in either
> read or write.  Thanks,
> 
> Signed-off-by: Josef Bacik <jbacik@...ionio.com>

Acked-by: Ingo Molnar <mingo@...nel.org>

Thanks,

	Ingo
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