From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 20 Oct 2013 12:44:39 +0000 (-0400)
Subject: nfsd regression since delayed fput()
X-Git-Tag: v3.12-rc7~9^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c7314d74fcb089b127ef5753b5263ac8473f33bc;p=pandora-kernel.git

nfsd regression since delayed fput()

Background: nfsd v[23] had throughput regression since delayed fput
went in; every read or write ends up doing fput() and we get a pair
of extra context switches out of that (plus quite a bit of work
in queue_work itselfi, apparently).  Use of schedule_delayed_work()
gives it a chance to accumulate a bit before we do __fput() on all
of them.  I'm not too happy about that solution, but... on at least
one real-world setup it reverts about 10% throughput loss we got from
switch to delayed fput.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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