From: Fengguang Wu <fengguang.wu@intel.com>
To: Wanpeng Li <liwp.linux@gmail.com>
Cc: linux-kernel@vger.kernel.org, Gavin Shan <shangw@linux.vnet.ibm.com>
Subject: Re: [PATCH v2] writeback: avoid race when update bandwidth
Date: Tue, 12 Jun 2012 19:52:19 +0800 [thread overview]
Message-ID: <20120612115219.GA17348@localhost> (raw)
In-Reply-To: <1339501561-4570-1-git-send-email-liwp.linux@gmail.com>
On Tue, Jun 12, 2012 at 07:46:01PM +0800, Wanpeng Li wrote:
> From: Wanpeng Li <liwp@linux.vnet.ibm.com>
>
> "V1 -> V2"
> * remove dirty_lock
>
> Since bdi->wb.list_lock is used to protect the b_* lists,
> so the flushers who call wb_writeback to writeback pages will
> stuck when bandwidth update policy holds this lock. In order
> to avoid this race we can introduce a new bandwidth_lock who
> is responsible for protecting bandwidth update policy.
>
> Signed-off-by: Wanpeng Li <liwp.linux@gmail.com>
Applied with a new title "writeback: use a standalone lock for
updating write bandwidth". "race" is sensitive because it often
refers to some locking error.
Thank you!
Fengguang
next prev parent reply other threads:[~2012-06-12 11:52 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-12 11:46 [PATCH v2] writeback: avoid race when update bandwidth Wanpeng Li
2012-06-12 11:52 ` Fengguang Wu [this message]
2012-06-12 11:58 ` Wanpeng Li
2012-06-13 3:59 ` Dave Chinner
2012-06-13 12:14 ` Fengguang Wu
2012-06-14 2:05 ` Dave Chinner
2012-06-14 14:00 ` Fengguang Wu
2012-06-15 0:06 ` Dave Chinner
2012-06-15 0:29 ` Fengguang Wu
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