linux-kernel - Re: [PATCH] writeback: Don't wait for completion in writeback_inodes_sb

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Message-ID: <20110719165345.GB11540@infradead.org>
Date:	Tue, 19 Jul 2011 12:53:45 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Curt Wohlgemuth <curtw@...gle.com>
Cc:	Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	fengguang.wu@...el.com
Subject: Re: [PATCH] writeback: Don't wait for completion in
 writeback_inodes_sb_nr

On Thu, Jul 14, 2011 at 09:29:34AM -0700, Curt Wohlgemuth wrote:
> Your patch looks good to me, in that it does hit all the bdevs with
> both WB_SYNC_NONE and SYNC_ALL.  However, I still say that the call to
> wakeup_flusher_threads() in sys_sync() is superfluous, at least as
> long as writeback_inodes_sb() waits for completion of the work item
> that it enqueues.

Commit 3beab0b42413e83a7907db7176b54c840fc75a81

	"sys_sync(): fix 16% performance regression in ffsb create_4k test"

suggests we need the wakeup_flusher_threads.  We might be able to get
rid of the writeback_inodes_sb call if we're lucky.

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