From 76c73407cb0337e69a8075167799992d930dcd3c Mon Sep 17 00:00:00 2001
From: Jim Harris <james.r.harris@intel.com>
Date: Thu, 11 Nov 2021 13:17:56 -0700
Subject: [PATCH] idxd: free ops to the head of the tailq

We allocate from the head, so it's better to free to
the head too for better cache utilization.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I5c32244f446bd7a1df12eefc81245b3ef7e24070
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/10193
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Community-CI: Mellanox Build Bot
Reviewed-by: John Kariuki <John.K.Kariuki@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
---
 lib/idxd/idxd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/idxd/idxd.c b/lib/idxd/idxd.c
index 0b5ed96fc..34c950425 100644
--- a/lib/idxd/idxd.c
+++ b/lib/idxd/idxd.c
@@ -1149,7 +1149,7 @@ spdk_idxd_process_events(struct spdk_idxd_io_channel *chan)
 			if (op->desc->opcode == IDXD_OPCODE_BATCH) {
 				_free_batch(op->batch, chan);
 			} else if (op->batch == NULL) {
-				TAILQ_INSERT_TAIL(&chan->ops_pool, op, link);
+				TAILQ_INSERT_HEAD(&chan->ops_pool, op, link);
 			}
 
 			if (cb_fn) {