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| author | Jianpeng Ma <majianpeng@gmail.com> | 2013-09-11 13:21:07 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2013-09-11 13:21:07 -0600 |
| commit | 7aef2e780b13973ea60aed8c556107dabde6a495 (patch) | |
| tree | 5265a24ffeaea32e2cefacf83962764d6d661a36 /block/blk-core.c | |
| parent | 6e4664525b1db28f8c4e1130957f70a94c19213e (diff) | |
| download | lwn-7aef2e780b13973ea60aed8c556107dabde6a495.tar.gz lwn-7aef2e780b13973ea60aed8c556107dabde6a495.zip | |
block: trace all devices plug operation
In func blk_queue_bio, if list of plug is empty,it will call
blk_trace_plug.
If process deal with a single device,it't ok.But if process deal with
multi devices,it only trace the first device.
Using request_count to judge, it can soleve this problem.
In addition, i modify the comment.
Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-core.c')
| -rw-r--r-- | block/blk-core.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 93a18d1d3da8..91037f74668e 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1549,11 +1549,9 @@ get_rq: if (plug) { /* * If this is the first request added after a plug, fire - * of a plug trace. If others have been added before, check - * if we have multiple devices in this plug. If so, make a - * note to sort the list before dispatch. + * of a plug trace. */ - if (list_empty(&plug->list)) + if (!request_count) trace_block_plug(q); else { if (request_count >= BLK_MAX_REQUEST_COUNT) { |