From: Sam Bradshaw <sbradshaw@micron.com>
Date: Fri, 6 Jun 2014 19:28:48 +0000 (-0600)
Subject: mtip32xx: minor performance enhancements
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~56^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f45c40a92d2c6915a0e88ff8a947095be2ba1c8e;p=pandora-kernel.git

mtip32xx: minor performance enhancements

This patch adds the following:

1) Compiler hinting in the fast path.
2) A prefetch of port->flags to eliminate moderate cpu stalling later
in mtip_hw_submit_io().
3) Eliminate a redundant rq_data_dir().
4) Reorder members of driver_data to eliminate false cacheline sharing
between irq_workers_active and unal_qdepth.

With some workload and topology configurations, I'm seeing ~1.5%
throughput improvement in small block random read benchmarks as well
as improved latency std. dev.

Signed-off-by: Sam Bradshaw <sbradshaw@micron.com>

Add include of <linux/prefetch.h>

Signed-off-by: Jens Axboe <axboe@fb.com>
---

Reading git-diff-tree failed