linux-ext4 - [Bug 15906] performance regression in "umount" of filesystems using barriers

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Date:	Fri, 21 May 2010 06:08:15 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15906] performance regression in "umount" of filesystems using
 barriers

https://bugzilla.kernel.org/show_bug.cgi?id=15906





--- Comment #28 from Jens Axboe <axboe@...nel.dk>  2010-05-21 06:08:09 ---
Eric is spot on, that latter commit does indeed fix up that issue. The problem
is that the caller holds the umount sem when initiating the WB_SYNC_NONE
writeback, and thus it passes down ->sb_pinned == 1. But since we clear the
work state for WB_SYNC_NONE early, the caller can then drop the umount sem
before we are actually done writing out inodes.

So the fix is queued up with the original patch, when it goes upstream there
should be no warnings.

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