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From: Jeff Moyer on 18 May 2010 14:30
This patch gets CFQ back in line with deadline for iozone runs, especially
those testing small files + fsync timings.

Signed-off-by: Jeff Moyer <jmoyer(a)redhat.com>
---
fs/jbd2/journal.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index c03d4dc..28848a6 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -41,6 +41,7 @@
#include <linux/hash.h>
#include <linux/log2.h>
#include <linux/vmalloc.h>
+#include <linux/blkdev.h>

#define CREATE_TRACE_POINTS
#include <trace/events/jbd2.h>
@@ -580,6 +581,11 @@ int jbd2_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, journal->j_task);
wake_up(&journal->j_wait_commit);
spin_unlock(&journal->j_state_lock);
wait_event(journal->j_wait_done_commit,
--
1.6.5.2

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