Add stripe batch and corresponding batch stripe release. Next patch will use it
to reduce device_lock locking.
Signed-off-by: Shaohua Li <shli@xxxxxxxxxxxx>
---
drivers/md/raid5.c | 35 +++++++++++++++++++++++++++++++++++
drivers/md/raid5.h | 6 ++++++
2 files changed, 41 insertions(+)
Index: linux/drivers/md/raid5.c
===================================================================
--- linux.orig/drivers/md/raid5.c 2012-06-01 14:03:17.062826938 +0800
+++ linux/drivers/md/raid5.c 2012-06-01 14:13:46.846909398 +0800
@@ -262,6 +262,41 @@ static void release_stripe(struct stripe
__release_stripe(conf, sh, 1);
}
+static void __release_stripe_flush_batch(struct stripe_head_batch *batch)
+{
+ int i;
+
+ for (i = 0; i < batch->count; i++) {
+ struct stripe_head *sh = batch->stripes[i];
+ __release_stripe(sh->raid_conf, sh, 0);
+ }
+ batch->count = 0;
+}
+
+static void release_stripe_flush_batch(struct stripe_head_batch *batch)
+{
+ struct r5conf *conf = batch->stripes[0]->raid_conf;
+
+ spin_lock_irq(&conf->device_lock);
+ __release_stripe_flush_batch(batch);
+ spin_unlock_irq(&conf->device_lock);
+}
+
+static void release_stripe_add_batch(struct stripe_head_batch *batch,
+ struct stripe_head *sh)
+{
+ struct r5conf *conf = sh->raid_conf;
+
+ preempt_disable();
+ if (batch->count > 0 && batch->stripes[0]->raid_conf != conf)
+ release_stripe_flush_batch(batch);
+ batch->stripes[batch->count] = sh;
+ batch->count++;
+ if (batch->count >= MAX_STRIPE_BATCH)
+ release_stripe_flush_batch(batch);
+ preempt_enable();
+}
+
static inline void remove_hash(struct stripe_head *sh)
{
pr_debug("remove_hash(), stripe %llu\n",
Index: linux/drivers/md/raid5.h
===================================================================
--- linux.orig/drivers/md/raid5.h 2012-06-01 13:44:19.229127709 +0800
+++ linux/drivers/md/raid5.h 2012-06-01 14:13:46.846909398 +0800
@@ -239,6 +239,12 @@ struct stripe_head {
} dev[1]; /* allocated with extra space depending of RAID geometry */
};
+#define MAX_STRIPE_BATCH 8
+struct stripe_head_batch {
+ struct stripe_head *stripes[MAX_STRIPE_BATCH];
+ int count;
+};
+
/* stripe_head_state - collects and tracks the dynamic state of a stripe_head
* for handle_stripe.
*/
--
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