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kernel/fs: fix I/O wait not accounted for RW O_DSYNC

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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>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Stephane Gasparini 2016-02-09 17:07:38 +01:00 committed by Jens Axboe
parent 09954bad44
commit d57d611505
1 changed files with 1 additions and 1 deletions
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2
block/bio.c
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@ -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;
}