From patchwork Wed Apr 14 21:17:05 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [3/4] jbd: yield the device queue when waiting for commits Date: Wed, 14 Apr 2010 11:17:05 -0000 From: Jeff Moyer X-Patchwork-Id: 50192 Message-Id: <1271279826-30294-4-git-send-email-jmoyer@redhat.com> To: jens.axboe@oracle.com Cc: linux-kernel@vger.kernel.org, linux-ext4@vger.kernel.org, vgoyal@redhat.com, Jeff Moyer This patch gets CFQ back in line with deadline for iozone runs, especially those testing small files + fsync timings. Signed-off-by: Jeff Moyer --- fs/jbd/journal.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c index bd224ee..c1df4b2 100644 --- a/fs/jbd/journal.c +++ b/fs/jbd/journal.c @@ -36,6 +36,7 @@ #include #include #include +#include #include #include @@ -549,6 +550,11 @@ int log_wait_commit(journal_t *journal, tid_t tid) while (tid_gt(tid, journal->j_commit_sequence)) { jbd_debug(1, "JBD: want %d, j_commit_sequence=%d\n", tid, journal->j_commit_sequence); + /* + * Give up our I/O scheduler time slice to allow the journal + * thread to issue I/O. + */ + blk_yield(journal->j_dev->bd_disk->queue); wake_up(&journal->j_wait_commit); spin_unlock(&journal->j_state_lock); wait_event(journal->j_wait_done_commit,