[1/1] kernel/fs: fix I/O wait not accounted for RW O_DSYNC
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Message ID 1454423085-73513-2-git-send-email-stephane.gasparini@linux.intel.com
State New
Headers show

Commit Message

Stephane Gasparini Feb. 2, 2016, 2:24 p.m. UTC
When a process is doing Random Write with O_DSYNC flag
 the I/O wait are not accounted in the kernel (get_cpu_iowait_time_us).
 This is preventing the governor or the cpufreq driver to account for
 I/O wait and thus use the right pstate

Signed-off-by: Stephane Gasparini <stephane.gasparini@linux.intel.com>
Signed-off-by: Philippe Longepe <philippe.longepe@linux.intel.com>
---
 block/bio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
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diff --git a/block/bio.c b/block/bio.c
index dbabd48b1934..f53a691b6533 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -874,7 +874,7 @@  int submit_bio_wait(int rw, struct bio *bio)
 	bio->bi_private = &ret;
 	bio->bi_end_io = submit_bio_wait_endio;
 	submit_bio(rw, bio);
-	wait_for_completion(&ret.event);
+	wait_for_completion_io(&ret.event);
 
 	return ret.error;
 }