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| author | Shaohua Li <shaohua.li@intel.com> | 2011-11-16 09:21:50 +0100 |
|---|---|---|
| committer | Ziyan <jaraidaniel@gmail.com> | 2016-01-08 10:36:21 +0100 |
| commit | 509f93403db854affb513debab37bf10f317426c (patch) | |
| tree | 0ba05629e505ca143bf5102f16f805abda4e88c9 /block/blk-core.c | |
| parent | bcd68b25f35f47db311f5ee8d20f0757b465f5dc (diff) | |
| download | kernel_samsung_tuna-509f93403db854affb513debab37bf10f317426c.zip kernel_samsung_tuna-509f93403db854affb513debab37bf10f317426c.tar.gz kernel_samsung_tuna-509f93403db854affb513debab37bf10f317426c.tar.bz2 | |
block: avoid unnecessary plug list flush
get_request_wait() could sleep and flush the plug list. If the list is
already flushed, don't flush again.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-core.c')
| -rw-r--r-- | block/blk-core.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index f9482c7..f249a21 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1243,15 +1243,17 @@ get_rq: */ if (list_empty(&plug->list)) trace_block_plug(q); - else if (!plug->should_sort) { - struct request *__rq; + else { + if (!plug->should_sort) { + struct request *__rq; - __rq = list_entry_rq(plug->list.prev); - if (__rq->q != q) - plug->should_sort = 1; + __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); } - if (request_count >= BLK_MAX_REQUEST_COUNT) - blk_flush_plug_list(plug, false); list_add_tail(&req->queuelist, &plug->list); plug->count++; drive_stat_acct(req, 1); |