From: Gu Zheng <guz.fnst@cn.fujitsu.com>
Date: Wed, 23 Jul 2014 10:03:54 +0000 (+0800)
Subject: aio: use iovec array rather than the single one
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~50^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=00fefb9cf2b5493a86912de55ba912bdfae4a207;p=pandora-kernel.git

aio: use iovec array rather than the single one

Previously, we only offer a single iovec to handle all the read/write cases, so
the PREADV/PWRITEV request always need to alloc more iovec buffer when copying
user vectors.
If we use a tmp iovec array rather than the single one, some small PREADV/PWRITEV
workloads(vector size small than the tmp buffer) will not need to alloc more
iovec buffer when copying user vectors.

Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
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