On Fri, Feb 25, 2011 at 10:21 AM, Nathaniel Smith <njs@xxxxxxxxx> wrote:
> static u64 _ktime_diff_to_now_and_unstash(ktime_t then, int * enqueued) {
>
> Â Â Â Âtimespec ts_then = ktime_to_timespec(then);
> Â Â Â Âtimespec ts_now = ktime_to_timespec(ktime_get());
> Â Â Â Â*enqueued = ts_then.tv_sec >> LATENCY_BITS;
> Â Â Â Âts_then.tv_sec &= (1 << LATENCY_BITS) - 1;
> Â Â Â Âts_now.tv_sec &= (1 << LATENCY_BITS) - 1;
> Â Â Â Âif (ts_now.tv_sec < ts_then.tv_sec)
> Â Â Â Â Â Â Â Âts_now.tv_sec += (1 << LATENCY_BITS);
> Â Â Â Â timespec_sub(ts_now, ts_then);
> }
Err, plus the 'return timespec_to_ns(...)' on the last line, that I
was trying to add when my computer suddenly decided I wanted to send
the message. How embarrassing.
Anyway, not sure this is a *good* idea, but it should work. Hopefully
we don't actually need to measure latencies > 256 seconds in this
context...
-- Nathaniel
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