| commit | b32232073e8061b41258bff2a10a06a91677480a | |
| author | Bart Van Assche <bvanassche@acm.org> | |
| Mon, 8 Dec 2014 15:46:34 +0000 (8 08:46 -0700) | ||
| committer | Jens Axboe <axboe@fb.com> | |
| Mon, 8 Dec 2014 15:46:34 +0000 (8 08:46 -0700) | ||
| tree | 5cf6507cccea99afd291e0274c205c6474895881 | treesnapshot (tar.gz zip) |
| parent | 6637fadf25657e619a50fde5ff3ae09a98d20eb5 | commitdiff |
blk-mq: fix hang in bt_get()
Avoid that if there are fewer hardware queues than CPU threads that
bt_get() can hang. The symptoms of the hang were as follows:
* All tags allocated for a particular hardware queue.
* (nr_tags) pending commands for that hardware queue.
* No pending commands for the software queues associated with that
hardware queue.
Signed-off-by: Jens Axboe <axboe@fb.com>
Avoid that if there are fewer hardware queues than CPU threads that
bt_get() can hang. The symptoms of the hang were as follows:
* All tags allocated for a particular hardware queue.
* (nr_tags) pending commands for that hardware queue.
* No pending commands for the software queues associated with that
hardware queue.
Signed-off-by: Jens Axboe <axboe@fb.com>
| block/blk-mq-tag.c | diffblobblamehistory |