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raid5-cache: switching to state machine for log disk cache flush

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Before we write stripe data to raid disks, we must guarantee stripe data
is settled down in log disk. To do this, we flush log disk cache and
wait the flush finish. That wait introduces sleep time in raid5d thread
and impact performance. This patch moves the log disk cache flush
process to the stripe handling state machine, which can remove the wait
in raid5d.

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Shaohua Li
2015-09-02 13:49:46 -07:00
committed by NeilBrown
parent 5c7e81c3de
commit a8c34f9159
2 changed files with 70 additions and 51 deletions
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7
drivers/md/raid5.c
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@@ -5740,8 +5740,12 @@ static int handle_active_stripes(struct r5conf *conf, int group,
for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++)
if (!list_empty(temp_inactive_list + i))
break;
if (i == NR_STRIPE_HASH_LOCKS)
if (i == NR_STRIPE_HASH_LOCKS) {
spin_unlock_irq(&conf->device_lock);
r5l_flush_stripe_to_raid(conf->log);
spin_lock_irq(&conf->device_lock);
return batch_size;
}
release_inactive = true;
}
spin_unlock_irq(&conf->device_lock);
@@ -5749,6 +5753,7 @@ static int handle_active_stripes(struct r5conf *conf, int group,
release_inactive_stripe_list(conf, temp_inactive_list,
NR_STRIPE_HASH_LOCKS);
r5l_flush_stripe_to_raid(conf->log);
if (release_inactive) {
spin_lock_irq(&conf->device_lock);
return 0;