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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>
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@ -1379,15 +1379,17 @@ get_rq:
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*/
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if (list_empty(&plug->list))
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trace_block_plug(q);
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else if (!plug->should_sort) {
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struct request *__rq;
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else {
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if (!plug->should_sort) {
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struct request *__rq;
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__rq = list_entry_rq(plug->list.prev);
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if (__rq->q != q)
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plug->should_sort = 1;
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__rq = list_entry_rq(plug->list.prev);
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if (__rq->q != q)
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plug->should_sort = 1;
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}
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if (request_count >= BLK_MAX_REQUEST_COUNT)
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blk_flush_plug_list(plug, false);
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}
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if (request_count >= BLK_MAX_REQUEST_COUNT)
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blk_flush_plug_list(plug, false);
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list_add_tail(&req->queuelist, &plug->list);
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drive_stat_acct(req, 1);
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} else {
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