Messages in this thread Patch in this message | | | From | Tejun Heo <> | Subject | [PATCH 36/36] block: make blk-throttle preserve the issuing task on delayed bios | Date | Tue, 21 Feb 2012 17:47:03 -0800 |
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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> --- 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 08b7ab2..4ba1418 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; -- 1.7.7.3
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