Hi,
On Monday 25 June 2007, Ingo Molnar wrote:
> the patch improves the sysbench OLTP macrobenchmark significantly:
Has that any real practical relevance?
> @@ -373,6 +376,20 @@ void do_gettimeofday (struct timeval *tv
>
> tv->tv_sec = sec;
> tv->tv_usec = usec;
> +
> + /*
> + * Make sure xtime.tv_sec [returned by sys_time()] always
> + * follows the gettimeofday() result precisely. This
> + * condition is extremely unlikely, it can hit at most
> + * once per second:
> + */
> + if (unlikely(xtime.tv_sec != tv->tv_sec)) {
> + unsigned long flags;
> +
> + write_seqlock_irqsave(&xtime_lock);
> + update_wall_time();
> + write_seqlock_irqrestore(&xtime_lock);
> + }
> }
>
> EXPORT_SYMBOL(do_gettimeofday);
Is this the do_gettimeofday() inside CONFIG_TIME_INTERPOLATION?
What did you test?
There can be many ways to read the clock, do you want to put this hook
everywhere? Wouldn't it be better to improve the clock performance?
bye, Roman
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
