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authorJens Axboe <jens.axboe@oracle.com>2009-04-06 16:48:04 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-06 19:04:53 +0400
commit6c4bac6b3351fd278dc3537dae42f88f733ff12e (patch)
tree682fd65d652851a3a67a8994036dfb70be7b93c3
parent9cf6b720f84d6999ff9a514d0a939dd183846aaf (diff)
downloadlinux-6c4bac6b3351fd278dc3537dae42f88f733ff12e.tar.xz
jbd: use WRITE_SYNC_PLUG instead of WRITE_SYNC
When you are going to be submitting several sync writes, we want to give the IO scheduler a chance to merge some of them. Instead of using the implicitly unplugging WRITE_SYNC variant, use WRITE_SYNC_PLUG and rely on sync_buffer() doing the unplug when someone does a wait_on_buffer()/lock_buffer(). Signed-off-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/jbd/commit.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c
index f8077b9c8981..a8e8513a78a9 100644
--- a/fs/jbd/commit.c
+++ b/fs/jbd/commit.c
@@ -351,8 +351,13 @@ void journal_commit_transaction(journal_t *journal)
spin_lock(&journal->j_state_lock);
commit_transaction->t_state = T_LOCKED;
+ /*
+ * Use plugged writes here, since we want to submit several before
+ * we unplug the device. We don't do explicit unplugging in here,
+ * instead we rely on sync_buffer() doing the unplug for us.
+ */
if (commit_transaction->t_synchronous_commit)
- write_op = WRITE_SYNC;
+ write_op = WRITE_SYNC_PLUG;
spin_lock(&commit_transaction->t_handle_lock);
while (commit_transaction->t_updates) {
DEFINE_WAIT(wait);