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author | Vladimir Davydov <vdavydov@parallels.com> | 2013-02-14 18:19:59 +0400 |
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committer | Jens Axboe <axboe@kernel.dk> | 2013-02-15 19:45:07 +0400 |
commit | 5577022f4ed8973762450ebe7fe7ebfd953817db (patch) | |
tree | c6c965101e32bf2b36155da0fc0ad94c696d4606 /block/Kconfig | |
parent | 686855f5d833178e518d79e7912cdb3268a9fa69 (diff) | |
download | linux-5577022f4ed8973762450ebe7fe7ebfd953817db.tar.xz |
block: account iowait time when waiting for completion of IO request
Using wait_for_completion() for waiting for a IO request to be executed
results in wrong iowait time accounting. For example, a system having
the only task doing write() and fdatasync() on a block device can be
reported being idle instead of iowaiting as it should because
blkdev_issue_flush() calls wait_for_completion() which in turn calls
schedule() that does not increment the iowait proc counter and thus does
not turn on iowait time accounting.
The patch makes block layer use wait_for_completion_io() instead of
wait_for_completion() where appropriate to account iowait time
correctly.
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/Kconfig')
0 files changed, 0 insertions, 0 deletions