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@xxxxxxxxxx>
---
fs/jbd/journal.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index 93d1e47..7bf7528 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -36,6 +36,7 @@
#include <linux/poison.h>
#include <linux/proc_fs.h>
#include <linux/debugfs.h>
+#include <linux/blkdev.h>
#include <asm/uaccess.h>
#include <asm/page.h>
@@ -183,6 +184,7 @@ loop:
should_sleep = 0;
if (should_sleep) {
spin_unlock(&journal->j_state_lock);
+ blk_yield(journal->j_dev->bd_disk->queue, NULL);
schedule();
spin_lock(&journal->j_state_lock);
}
@@ -549,6 +551,11 @@ 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, 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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