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raid5: raid5d handle stripe in batch way 

Let raid5d handle stripe in batch way to reduce conf->device_lock locking.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Shaohua Li 2012-08-02 08:33:15 +10:00 committed by NeilBrown
parent 8811b5968f
commit 46a06401f6
1 changed files with 32 additions and 13 deletions
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45
drivers/md/raid5.c
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@ -4574,6 +4574,30 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
return handled;
}
#define MAX_STRIPE_BATCH 8
static int handle_active_stripes(struct r5conf *conf)
{
struct stripe_head *batch[MAX_STRIPE_BATCH], *sh;
int i, batch_size = 0;
while (batch_size < MAX_STRIPE_BATCH &&
(sh = __get_priority_stripe(conf)) != NULL)
batch[batch_size++] = sh;
if (batch_size == 0)
return batch_size;
spin_unlock_irq(&conf->device_lock);
for (i = 0; i < batch_size; i++)
handle_stripe(batch[i]);
cond_resched();
spin_lock_irq(&conf->device_lock);
for (i = 0; i < batch_size; i++)
__release_stripe(conf, batch[i]);
return batch_size;
}
/*
* This is our raid5 kernel thread.
@ -4584,7 +4608,6 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
*/
static void raid5d(struct mddev *mddev)
{
struct stripe_head *sh;
struct r5conf *conf = mddev->private;
int handled;
struct blk_plug plug;
@ -4598,6 +4621,7 @@ static void raid5d(struct mddev *mddev)
spin_lock_irq(&conf->device_lock);
while (1) {
struct bio *bio;
int batch_size;
if (
!list_empty(&conf->bitmap_list)) {
@ -4621,21 +4645,16 @@ static void raid5d(struct mddev *mddev)
handled++;
}
sh = __get_priority_stripe(conf);
if (!sh)
batch_size = handle_active_stripes(conf);
if (!batch_size)
break;
spin_unlock_irq(&conf->device_lock);
handled++;
handle_stripe(sh);
release_stripe(sh);
cond_resched();
handled += batch_size;
if (mddev->flags & ~(1<<MD_CHANGE_PENDING))
if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) {
spin_unlock_irq(&conf->device_lock);
md_check_recovery(mddev);
spin_lock_irq(&conf->device_lock);
spin_lock_irq(&conf->device_lock);
}
}
pr_debug("%d stripes handled\n", handled);