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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>
This commit is contained in:
Jens Axboe 2009-04-06 14:48:05 +02:00 committed by Linus Torvalds
parent 6c4bac6b33
commit 4194b1eaf1
1 changed files with 9 additions and 4 deletions
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13
fs/jbd2/commit.c
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@ -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,