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| author | Jens Axboe <jaxboe@fusionio.com> | 2011-03-10 08:58:35 +0100 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2011-03-10 08:58:35 +0100 |
| commit | 4c63f5646e405b5010cc9499419060bf2e838f5b (patch) | |
| tree | df91ba315032c8ec4aafeb3ab96fdfa7c6c656e1 /kernel | |
| parent | staging: Convert to bdops->check_events() (diff) | |
| parent | blk-throttle: Use blk_plug in throttle dispatch (diff) | |
| download | linux-4c63f5646e405b5010cc9499419060bf2e838f5b.tar.xz linux-4c63f5646e405b5010cc9499419060bf2e838f5b.zip | |
Merge branch 'for-2.6.39/stack-plug' into for-2.6.39/core
Conflicts:
block/blk-core.c
block/blk-flush.c
drivers/md/raid1.c
drivers/md/raid10.c
drivers/md/raid5.c
fs/nilfs2/btnode.c
fs/nilfs2/mdt.c
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/exit.c | 1 | ||||
| -rw-r--r-- | kernel/fork.c | 3 | ||||
| -rw-r--r-- | kernel/power/block_io.c | 2 | ||||
| -rw-r--r-- | kernel/sched.c | 12 |
4 files changed, 17 insertions, 1 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index f9a45ebcc7b1..6a488ad2dce5 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -908,6 +908,7 @@ NORET_TYPE void do_exit(long code) profile_task_exit(tsk); WARN_ON(atomic_read(&tsk->fs_excl)); + WARN_ON(blk_needs_flush_plug(tsk)); if (unlikely(in_interrupt())) panic("Aiee, killing interrupt handler!"); diff --git a/kernel/fork.c b/kernel/fork.c index 25e429152ddc..027c80e5162f 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1204,6 +1204,9 @@ static struct task_struct *copy_process(unsigned long clone_flags, * Clear TID on mm_release()? */ p->clear_child_tid = (clone_flags & CLONE_CHILD_CLEARTID) ? child_tidptr: NULL; +#ifdef CONFIG_BLOCK + p->plug = NULL; +#endif #ifdef CONFIG_FUTEX p->robust_list = NULL; #ifdef CONFIG_COMPAT diff --git a/kernel/power/block_io.c b/kernel/power/block_io.c index 83bbc7c02df9..d09dd10c5a5e 100644 --- a/kernel/power/block_io.c +++ b/kernel/power/block_io.c @@ -28,7 +28,7 @@ static int submit(int rw, struct block_device *bdev, sector_t sector, struct page *page, struct bio **bio_chain) { - const int bio_rw = rw | REQ_SYNC | REQ_UNPLUG; + const int bio_rw = rw | REQ_SYNC; struct bio *bio; bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1); diff --git a/kernel/sched.c b/kernel/sched.c index 18d38e4ec7ba..ca098bf4cc65 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3978,6 +3978,16 @@ need_resched_nonpreemptible: switch_count = &prev->nvcsw; } + /* + * If we are going to sleep and we have plugged IO queued, make + * sure to submit it to avoid deadlocks. + */ + if (prev->state != TASK_RUNNING && blk_needs_flush_plug(prev)) { + raw_spin_unlock(&rq->lock); + blk_flush_plug(prev); + raw_spin_lock(&rq->lock); + } + pre_schedule(rq, prev); if (unlikely(!rq->nr_running)) @@ -5333,6 +5343,7 @@ void __sched io_schedule(void) delayacct_blkio_start(); atomic_inc(&rq->nr_iowait); + blk_flush_plug(current); current->in_iowait = 1; schedule(); current->in_iowait = 0; @@ -5348,6 +5359,7 @@ long __sched io_schedule_timeout(long timeout) delayacct_blkio_start(); atomic_inc(&rq->nr_iowait); + blk_flush_plug(current); current->in_iowait = 1; ret = schedule_timeout(timeout); current->in_iowait = 0; |