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md: use new plugging interface for RAID IO. 

md/raid submits a lot of IO from the various raid threads.
So adding start/finish plug calls to those so that some
plugging happens.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2011-04-18 18:25:41 +10:00
parent 99e22598e9
commit e1dfa0a297
3 changed files with 10 additions and 1 deletions
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5
drivers/md/raid1.c
View File

@ -1516,9 +1516,11 @@ static void raid1d(mddev_t *mddev)
conf_t *conf = mddev->private;
struct list_head *head = &conf->retry_list;
mdk_rdev_t *rdev;
struct blk_plug plug;
md_check_recovery(mddev);
blk_start_plug(&plug);
for (;;) {
char b[BDEVNAME_SIZE];
@ -1593,6 +1595,7 @@ static void raid1d(mddev_t *mddev)
}
cond_resched();
}
blk_finish_plug(&plug);
}

3
drivers/md/raid10.c
View File

@ -1640,9 +1640,11 @@ static void raid10d(mddev_t *mddev)
conf_t *conf = mddev->private;
struct list_head *head = &conf->retry_list;
mdk_rdev_t *rdev;
struct blk_plug plug;
md_check_recovery(mddev);
blk_start_plug(&plug);
for (;;) {
char b[BDEVNAME_SIZE];
@ -1716,6 +1718,7 @@ static void raid10d(mddev_t *mddev)
}
cond_resched();
}
blk_finish_plug(&plug);
}

3
drivers/md/raid5.c
View File

@ -4478,11 +4478,13 @@ static void raid5d(mddev_t *mddev)
struct stripe_head *sh;
raid5_conf_t *conf = mddev->private;
int handled;
struct blk_plug plug;
pr_debug("+++ raid5d active\n");
md_check_recovery(mddev);
blk_start_plug(&plug);
handled = 0;
spin_lock_irq(&conf->device_lock);
while (1) {
@ -4525,6 +4527,7 @@ static void raid5d(mddev_t *mddev)
spin_unlock_irq(&conf->device_lock);
async_tx_issue_pending_all();
blk_finish_plug(&plug);
pr_debug("--- raid5d inactive\n");
}