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authorJianpeng Ma <majianpeng@gmail.com>2013-01-11 14:46:09 +0100
committerJens Axboe <axboe@kernel.dk>2013-01-11 14:46:09 +0100
commit422765c2638924da10ff363b5eed77924911bdc7 (patch)
tree76ae39f6f744e45ec023859c2d46fad2aeaf7714 /block
parent242d98f077ac0ab80920219769eb095503b93f61 (diff)
downloadvexpress-lsk-422765c2638924da10ff363b5eed77924911bdc7.tar.gz
block: Remove should_sort judgement when flush blk_plug
In commit 975927b942c932,it add blk_rq_pos to sort rq when flushing. Although this commit was used for the situation which blk_plug handled multi devices on the same time like md device. I think there must be some situations like this but only single device. So remove the should_sort judgement. Because the parameter should_sort is only for this purpose,it can delete should_sort from blk_plug. CC: Shaohua Li <shli@kernel.org> Signed-off-by: Jianpeng Ma <majianpeng@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c13
1 files changed, 1 insertions, 12 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index c973249d68c..aca5d82ff13 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1548,13 +1548,6 @@ get_rq:
if (list_empty(&plug->list))
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);
@@ -2888,7 +2881,6 @@ void blk_start_plug(struct blk_plug *plug)
plug->magic = PLUG_MAGIC;
INIT_LIST_HEAD(&plug->list);
INIT_LIST_HEAD(&plug->cb_list);
- plug->should_sort = 0;
/*
* If this is a nested plug, don't actually assign it. It will be
@@ -2990,10 +2982,7 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
list_splice_init(&plug->list, &list);
- if (plug->should_sort) {
- list_sort(NULL, &list, plug_rq_cmp);
- plug->should_sort = 0;
- }
+ list_sort(NULL, &list, plug_rq_cmp);
q = NULL;
depth = 0;