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authorJens Axboe <jens.axboe@oracle.com>2009-04-06 12:48:05 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-06 15:04:54 (GMT)
commit4194b1eaf18ddc3eee9597e8800b6d2ffdfd3614 (patch)
tree34083152f17c6dbf61729a2194658ebcc041a62c /fs/jbd2
parent6c4bac6b3351fd278dc3537dae42f88f733ff12e (diff)
downloadlinux-4194b1eaf18ddc3eee9597e8800b6d2ffdfd3614.tar.xz
jbd2: 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>
Diffstat (limited to 'fs/jbd2')
-rw-r--r--fs/jbd2/commit.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 4ea7237..073c8c3 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -138,7 +138,7 @@ static int journal_submit_commit_record(journal_t *journal,
set_buffer_ordered(bh);
barrier_done = 1;
}
- ret = submit_bh(WRITE_SYNC, bh);
+ ret = submit_bh(WRITE_SYNC_PLUG, bh);
if (barrier_done)
clear_buffer_ordered(bh);
@@ -159,7 +159,7 @@ static int journal_submit_commit_record(journal_t *journal,
lock_buffer(bh);
set_buffer_uptodate(bh);
clear_buffer_dirty(bh);
- ret = submit_bh(WRITE_SYNC, bh);
+ ret = submit_bh(WRITE_SYNC_PLUG, bh);
}
*cbh = bh;
return ret;
@@ -190,7 +190,7 @@ retry:
set_buffer_uptodate(bh);
bh->b_end_io = journal_end_buffer_io_sync;
- ret = submit_bh(WRITE_SYNC, bh);
+ ret = submit_bh(WRITE_SYNC_PLUG, bh);
if (ret) {
unlock_buffer(bh);
return ret;
@@ -402,8 +402,13 @@ void jbd2_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;
stats.u.run.rs_wait = commit_transaction->t_max_wait;
stats.u.run.rs_locked = jiffies;
stats.u.run.rs_running = jbd2_time_diff(commit_transaction->t_start,