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| author | Jens Axboe <jens.axboe@oracle.com> | 2009-04-06 16:48:04 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-06 19:04:53 +0400 |
| commit | 6c4bac6b3351fd278dc3537dae42f88f733ff12e (patch) | |
| tree | 682fd65d652851a3a67a8994036dfb70be7b93c3 | |
| parent | 9cf6b720f84d6999ff9a514d0a939dd183846aaf (diff) | |
| download | linux-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.c | 7 |
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); |