On Tue, Aug 23, 2005 at 02:32:36PM +0200, Jens Axboe wrote:
> Hi,
>
> This is a little something I have played with. It allows you to see
> exactly what is going on in the block layer for a given queue. Currently
> it can logs request queueing and building, dispatches, requeues, and
> completions.
Ah, fabulous. Thanks Jens!
> + t.magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
> + t.sequence = atomic_add_return(1, &bt->sequence);
> + t.time = sched_clock() / 1000;
Wouldn't it be better to pass out the highest precision available here
& then do the conversion in userspace instead? I guess one might want
that little bit more for a RAM disk or something ... actually, talking
to one of the SGI people here with alot of experience on IRIX with a
similar facility, the msec resolution there is apparently sometimes an
issue already with fast storage.
cheers.
--
Nathan
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