On Thu, 2007-08-16 at 21:37 -0300, Luis Claudio R. Goncalves wrote:
> Hello,
>
> The values in /proc/loadavgrt are sometimes the real load and sometimes
> garbage. As you can see in th tests below, it occurs from in 2.6.21.5-rt20
> to 2.6.23-rc2-rt2. The code for calc_load(), in kernel/timer.c has not
> changed much in -rt patches.
>
> Signed-off-by: Luis Claudio R. Goncalves <[EMAIL PROTECTED]>
> ---
>
> diff --git a/kernel/sched.c b/kernel/sched.c
> index 811a502..c61609a 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -2520,6 +2520,13 @@ unsigned long rt_nr_uninterruptible(void)
> for_each_online_cpu(i)
> sum += cpu_rq(i)->rt_nr_uninterruptible;
>
> + /*
> + * Since we read the counters lockless, it might be slightly
> + * inaccurate. Do not allow it to go below zero though:
> + */
> + if (unlikely((long)sum < 0))
> + sum = 0;
> +
> return sum;
> }
>
> diff --git a/linux-2.6.21.x86_64/kernel/timer.c
> b/linux-2.6.21.x86_64_lc/kernel/timer.c
> index 882ca9d..0e49bf6 100644
> --- a/linux-2.6.21.x86_64/kernel/timer.c
> +++ b/linux-2.6.21.x86_64_lc/kernel/timer.c
> @@ -1432,23 +1432,25 @@ unsigned long avenrun_rt[3];
> static inline void calc_load(unsigned long ticks)
> {
> unsigned long active_tasks; /* fixed-point */
> + unsigned long active_rt_tasks; /* fixed-point */
> static int count = LOAD_FREQ;
>
> count -= ticks;
> if (unlikely(count < 0)) {
> active_tasks = count_active_tasks();
> + active_rt_tasks = count_active_rt_tasks();
Where is this used?
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