From: Fam Zheng <famz@redhat.com>
Date: Thu, 6 Nov 2014 12:44:36 +0000 (+0800)
Subject: aio: Skip timer for io_getevents if timeout=0
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~87^2
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5f785de588735306ec4d7c875caf9d28481c8b21;p=pandora-kernel.git

aio: Skip timer for io_getevents if timeout=0

In this case, it is basically a polling. Let's not involve timer at all
because that would hurt performance for application event loops.

In an arbitrary test I've done, io_getevents syscall elapsed time
reduces from 50000+ nanoseconds to a few hundereds.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
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