Re: [tip:sched/core] sched: Lower chances of cputime scaling overflow

[Stanislaw Gruszka]

On Thu, Apr 11, 2013 at 08:38:37AM -0700, Linus Torvalds wrote:
>     /* We know one of the values has a bit set in the high 32 bits */
>     for (;;) {
>         /* Make sure "stime" is the bigger of stime/rtime */
>         if (rtime > stime) {
>             u64 tmp = stime; stime = rtime; rtime = tmp;
>         }

For most workloads rtime is bigger than stime, so swapping those would
save some cycles on common cases. Otherwise this algorithm looks great.

Thanks
Stanislaw

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