linux-kernel - Re: [PATCHv6 00/15] kill unnecessary bdi wakeups + cleanups

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Message-ID: <4C580B1C.3020409@kernel.dk>
Date:	Tue, 03 Aug 2010 14:27:08 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Artem Bityutskiy <dedekind1@...il.com>
CC:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCHv6 00/15] kill unnecessary bdi wakeups + cleanups

On 2010-07-25 13:29, Artem Bityutskiy wrote:
> Hi,
> 
> here is v6 of the patch series which clean-ups bdi threads and substantially
> lessens amount of unnecessary kernel wake-ups, which is very important on
> battery-powered devices.
> 
> This patch-set is also available at:
> git://git.infradead.org/users/dedekind/misc-2.6.git flushers_v6

Thanks Artem, for sticking around long enough to get this into
shape. I have finally merged it.

> 1. Use 'spin_lock_bh' for the 'bdi->wb_lock' (changed patch N12)

I'd rather not, question is how to avoid it. Either just wakeup the
default thread, or punt the lock-and-check bdi->wb.task to a thread.

-- 
Jens Axboe

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