block: add sysfs file for controlling io stats accounting
authorJens Axboe <jens.axboe@oracle.com>
Fri, 23 Jan 2009 09:54:44 +0000 (10:54 +0100)
committerJens Axboe <jens.axboe@oracle.com>
Fri, 30 Jan 2009 11:34:38 +0000 (12:34 +0100)
This allows us to turn off disk stat accounting completely, for the cases
where the 0.5-1% reduction in system time is important.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

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