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authorJoe Thornber <ejt@redhat.com>2012-12-21 20:23:31 +0000
committerAlasdair G Kergon <agk@redhat.com>2012-12-21 20:23:31 +0000
commit563af186df08002d2600c4e718ad8f3bde109f53 (patch)
treee8ba7cf56e84a1aacb77d41499387c89bf58cce6 /drivers/md
parente8088073c9610af017fd47fddd104a2c3afb32e8 (diff)
dm thin: wake worker when discard is prepared
When discards are prepared it is best to directly wake the worker that will process them. The worker will be woken anyway, via periodic commit, but there is no reason to not wake_worker here. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-thin.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 41c9e81ba74..aeb9e20f597 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -2676,10 +2676,13 @@ static int thin_endio(struct dm_target *ti,
if (h->all_io_entry) {
INIT_LIST_HEAD(&work);
dm_deferred_entry_dec(h->all_io_entry, &work);
- spin_lock_irqsave(&pool->lock, flags);
- list_for_each_entry_safe(m, tmp, &work, list)
- list_add(&m->list, &pool->prepared_discards);
- spin_unlock_irqrestore(&pool->lock, flags);
+ if (!list_empty(&work)) {
+ spin_lock_irqsave(&pool->lock, flags);
+ list_for_each_entry_safe(m, tmp, &work, list)
+ list_add(&m->list, &pool->prepared_discards);
+ spin_unlock_irqrestore(&pool->lock, flags);
+ wake_worker(pool);
+ }
}
mempool_free(h, pool->endio_hook_pool);