From: Matthew Wilcox <matthew.r.wilcox@intel.com>
Date: Thu, 27 Mar 2014 20:40:35 +0000 (-0400)
Subject: fusion: Add free msg frames to the head, not tail of list
X-Git-Tag: v4.14-rc1~7360^2~42
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ecc3bc982596cb66bd7f951e2f36503f4841c0c8;p=platform%2Fkernel%2Flinux-rpi.git

fusion: Add free msg frames to the head, not tail of list

Reusing a msg frame quickly means it's still cache-hot.  This yields
a small but noticable performance improvement in a well-known database
benchmark.  This improvement is already present in the mpt3sas driver.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org>
Reviewed-by: Praveen Krishnamoorthy <Praveen.krishnamoorthy@lsi.com>
Acked-by: Sreekanth Reddy <Sreekanth.reddy@lsi.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---

diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index 570b18a..ebc0af7 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -1037,7 +1037,7 @@ mpt_free_msg_frame(MPT_ADAPTER *ioc, MPT_FRAME_HDR *mf)
 		goto out;
 	/* signature to know if this mf is freed */
 	mf->u.frame.linkage.arg1 = cpu_to_le32(0xdeadbeaf);
-	list_add_tail(&mf->u.frame.linkage.list, &ioc->FreeQ);
+	list_add(&mf->u.frame.linkage.list, &ioc->FreeQ);
 #ifdef MFCNT
 	ioc->mfcnt--;
 #endif