From: Theodore Ts'o <tytso@mit.edu>
Date: Thu, 7 Feb 2013 03:30:23 +0000 (-0500)
Subject: jbd2: track request delay statistics
X-Git-Tag: v3.9-rc1~64^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9fff24aa2c5c504aadead1ff9599e813604c2e53;p=pandora-kernel.git

jbd2: track request delay statistics

Track the delay between when we first request that the commit begin
and when it actually begins, so we can see how much of a gap exists.
In theory, this should just be the remaining scheduling quantuum of
the thread which requested the commit (assuming it was not a
synchronous operation which triggered the commit request) plus
scheduling overhead; however, it's possible that real time processes
might get in the way of letting the kjournald thread from executing.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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