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blktrace: fix comment in blktrace_api.h

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The `__u64 time` field of the blk_io_trace struct refers to
the time in nanoseconds, not in microseconds. It is set in
__blk_add_trace, which does the following:

    t->time = ktime_to_ns(ktime_get());

ktime_to_ns returns ktime_t in nanoseconds, not microseconds.

Signed-off-by: Souvik Banerjee <souvik1997@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Souvik Banerjee 2018-03-30 14:32:42 -05:00 committed by Jens Axboe
parent b65125fa57
commit a5040c2d8d
1 changed files with 1 additions and 1 deletions
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2
include/uapi/linux/blktrace_api.h
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@ -101,7 +101,7 @@ enum blktrace_notify {
struct blk_io_trace {
__u32 magic; /* MAGIC << 8 | version */
__u32 sequence; /* event number */
__u64 time; /* in microseconds */
__u64 time; /* in nanoseconds */
__u64 sector; /* disk offset */
__u32 bytes; /* transfer length */
__u32 action; /* what happened */