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

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Message-ID: <20120612115746.GA3980@kernel>
Date:	Tue, 12 Jun 2012 19:58:21 +0800
From:	Wanpeng Li <liwp.linux@...il.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	linux-kernel@...r.kernel.org,
	Gavin Shan <shangw@...ux.vnet.ibm.com>,
	Wanpeng Li <liwp.linux@...il.com>
Subject: Re: [PATCH v2] writeback: avoid race when update bandwidth

On Tue, Jun 12, 2012 at 07:52:19PM +0800, Fengguang Wu wrote:
>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.

OK, Thanks a lot.

Regards,
Wanpeng Li
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