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From: Ingo Molnar <mingo@kernel.org>
To: Josef Bacik <jbacik@fusionio.com>
Cc: linux-btrfs@vger.kernel.org, walken@google.com,
	linux-kernel@vger.kernel.org, peter@hurleysoftware.com,
	akpm@linux-foundation.org
Subject: Re: [PATCH 1/2] rwsem: add rwsem_is_contended V3
Date: Thu, 26 Sep 2013 16:16:06 +0200	[thread overview]
Message-ID: <20130926141606.GA32444@gmail.com> (raw)
In-Reply-To: <1380201996-17445-1-git-send-email-jbacik@fusionio.com>


* Josef Bacik <jbacik@fusionio.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@fusionio.com>

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

Thanks,

	Ingo

      parent reply	other threads:[~2013-09-26 14:16 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-09-26 13:26 [PATCH 1/2] rwsem: add rwsem_is_contended V3 Josef Bacik
2013-09-26 13:26 ` [PATCH 2/2] Btrfs: stop caching thread if extent_commit_sem is contended Josef Bacik
2013-10-17  7:51   ` Alex Lyakas
2013-09-26 14:16 ` Ingo Molnar [this message]

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