On 4/7/05, Srivatsa Vaddagiri <[email protected]> wrote:
> Hi,
> VST patch (http://lwn.net/Articles/118693/) attempts to avoid useless
> regular (local) timer ticks when a CPU is idle.
<snip>
> linux-2.6.11-vatsa/kernel/sched.c | 52 ++++++++++++++++++++++++++++++++++++++
> 1 files changed, 52 insertions(+)
>
> diff -puN kernel/sched.c~vst-sched_load_balance kernel/sched.c
> --- linux-2.6.11/kernel/sched.c~vst-sched_load_balance 2005-04-07 17:51:34.000000000 +0530
> +++ linux-2.6.11-vatsa/kernel/sched.c 2005-04-07 17:56:18.000000000 +0530
<snip>
> @@ -1796,6 +1817,25 @@ find_busiest_group(struct sched_domain *
>
> nr_cpus++;
> avg_load += load;
> +
> +#ifdef CONFIG_VST
> + if (idle != NOT_IDLE || !grp_sleeping ||
> + (grp_sleeping && woken))
> + continue;
> +
> + sd1 = sd + (i-cpu);
> + interval = sd1->balance_interval;
> +
> + /* scale ms to jiffies */
> + interval = msecs_to_jiffies(interval);
> + if (unlikely(!interval))
> + interval = 1;
> +
> + if (jiffies - sd1->last_balance >= interval) {
> + woken = 1;
> + cpu_set(i, wakemask);
> + }
Sorry for the late reply, but shouldn't this jiffies comparison be
done with time_after() or time_before()?
Thanks,
Nish
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