diff options
| author | Tejun Heo <tj@kernel.org> | 2012-03-05 13:15:26 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2012-03-06 21:27:24 +0100 |
| commit | f6e8d01bee036460e03bd4f6a79d014f98ba712e (patch) | |
| tree | acaaab3667e0450f0f05464426c3540c89ce4e18 /block/cfq-iosched.c | |
| parent | 3d48749d93a3dce732dd30a14002ab90ec4355f3 (diff) | |
| download | lwn-f6e8d01bee036460e03bd4f6a79d014f98ba712e.tar.gz lwn-f6e8d01bee036460e03bd4f6a79d014f98ba712e.zip | |
block: add io_context->active_ref
Currently ioc->nr_tasks is used to decide two things - whether an ioc
is done issuing IOs and whether it's shared by multiple tasks. This
patch separate out the first into ioc->active_ref, which is acquired
and released using {get|put}_io_context_active() respectively.
This will be used to associate bio's with a given task. This patch
doesn't introduce any visible behavior change.
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/cfq-iosched.c')
| -rw-r--r-- | block/cfq-iosched.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 9e386d9bcb79..9a4eac490e0b 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -1865,7 +1865,7 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd) * task has exited, don't wait */ cic = cfqd->active_cic; - if (!cic || !atomic_read(&cic->icq.ioc->nr_tasks)) + if (!cic || !atomic_read(&cic->icq.ioc->active_ref)) return; /* @@ -2841,7 +2841,7 @@ cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq, if (cfqq->next_rq && (cfqq->next_rq->cmd_flags & REQ_NOIDLE)) enable_idle = 0; - else if (!atomic_read(&cic->icq.ioc->nr_tasks) || + else if (!atomic_read(&cic->icq.ioc->active_ref) || !cfqd->cfq_slice_idle || (!cfq_cfqq_deep(cfqq) && CFQQ_SEEKY(cfqq))) enable_idle = 0; |