linux-kernel - Re: [PATCH v2] writeback: avoid race when update bandwidth

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Message-ID: <20120612115219.GA17348@localhost>
Date:	Tue, 12 Jun 2012 19:52:19 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Wanpeng Li <liwp.linux@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Gavin Shan <shangw@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2] writeback: avoid race when update bandwidth

On Tue, Jun 12, 2012 at 07:46:01PM +0800, Wanpeng Li wrote:
> From: Wanpeng Li <liwp@...ux.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@...il.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
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