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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>
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1 changed files with 6 additions and 1 deletions
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@ -351,8 +351,13 @@ void journal_commit_transaction(journal_t *journal)
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spin_lock(&journal->j_state_lock);
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commit_transaction->t_state = T_LOCKED;
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/*
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* Use plugged writes here, since we want to submit several before
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* we unplug the device. We don't do explicit unplugging in here,
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* instead we rely on sync_buffer() doing the unplug for us.
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*/
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if (commit_transaction->t_synchronous_commit)
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write_op = WRITE_SYNC;
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write_op = WRITE_SYNC_PLUG;
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spin_lock(&commit_transaction->t_handle_lock);
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while (commit_transaction->t_updates) {
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DEFINE_WAIT(wait);
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