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| author | Tejun Heo <tj@kernel.org> | 2012-03-05 13:15:29 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2012-03-06 21:27:24 +0100 |
| commit | 671058fb2a2aac4e70f01b316b06bc59b98bd138 (patch) | |
| tree | 6c49961409ad0e3c16b5e2027f515cafecedf39a /block/blk-throttle.c | |
| parent | 4f85cb96d9d2fbbb7160db855a6beee1baced5e5 (diff) | |
| download | linux-671058fb2a2aac4e70f01b316b06bc59b98bd138.tar.gz linux-671058fb2a2aac4e70f01b316b06bc59b98bd138.tar.bz2 linux-671058fb2a2aac4e70f01b316b06bc59b98bd138.zip | |
block: make blk-throttle preserve the issuing task on delayed bios
Make blk-throttle call bio_associate_current() on bios being delayed
such that they get issued to block layer with the original io_context.
This allows stacking blk-throttle and cfq-iosched propio policies.
bios will always be issued with the correct ioc and blkcg whether it
gets delayed by blk-throttle or not.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-throttle.c')
| -rw-r--r-- | block/blk-throttle.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 08b7ab292a80..4ba141820a2e 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -894,6 +894,9 @@ bool blk_throtl_bio(struct request_queue *q, struct bio *bio) goto out; } + /* bio_associate_current() needs ioc, try creating */ + create_io_context(GFP_ATOMIC, q->node); + /* * A throtl_grp pointer retrieved under rcu can be used to access * basic fields like stats and io rates. If a group has no rules, @@ -958,6 +961,7 @@ queue_bio: tg->io_disp[rw], tg->iops[rw], tg->nr_queued[READ], tg->nr_queued[WRITE]); + bio_associate_current(bio); throtl_add_bio_tg(q->td, tg, bio); throttled = true; |