[PATCH 1/3] block: avoid unnecessary plug should_sort test.

[Jianpeng Ma]

If request_count >= BLK_MAX_REQUEST_COUNT,then it will exec
blk_flush_plug_list which plug all request.So no need to do plug->should_sort 
test.

Signed-off-by: Jianpeng Ma 
---
 block/blk-core.c |9 -
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 4b4dbdf..7a3abc6 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1514,17 +1514,16 @@ get_rq:
if (list_empty(>list))
trace_block_plug(q);
else {
-   if (!plug->should_sort) {
+   if (request_count >= BLK_MAX_REQUEST_COUNT) {
+   blk_flush_plug_list(plug, false);
+   trace_block_plug(q);
+   } else if (!plug->should_sort) {
struct request *__rq;
 
__rq = list_entry_rq(plug->list.prev);
if (__rq->q != q)
plug->should_sort = 1;
}
-   if (request_count >= BLK_MAX_REQUEST_COUNT) {
-   blk_flush_plug_list(plug, false);
-   trace_block_plug(q);
-   }
}
list_add_tail(>queuelist, >list);
drive_stat_acct(req, 1);
-- 
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[PATCH 1/3] block: avoid unnecessary plug should_sort test.

[Jianpeng Ma]

If request_count = BLK_MAX_REQUEST_COUNT,then it will exec
blk_flush_plug_list which plug all request.So no need to do plug-should_sort 
test.

Signed-off-by: Jianpeng Ma majianp...@gmail.com
---
 block/blk-core.c |9 -
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 4b4dbdf..7a3abc6 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1514,17 +1514,16 @@ get_rq:
if (list_empty(plug-list))
trace_block_plug(q);
else {
-   if (!plug-should_sort) {
+   if (request_count = BLK_MAX_REQUEST_COUNT) {
+   blk_flush_plug_list(plug, false);
+   trace_block_plug(q);
+   } else if (!plug-should_sort) {
struct request *__rq;
 
__rq = list_entry_rq(plug-list.prev);
if (__rq-q != q)
plug-should_sort = 1;
}
-   if (request_count = BLK_MAX_REQUEST_COUNT) {
-   blk_flush_plug_list(plug, false);
-   trace_block_plug(q);
-   }
}
list_add_tail(req-queuelist, plug-list);
drive_stat_acct(req, 1);
-- 
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