Re: [PATCH 5/6] sched: Remove irq time from available CPU power
From: Venkatesh Pallipadi
Date: Mon Sep 20 2010 - 13:39:29 EST
On Sun, Sep 19, 2010 at 4:31 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> On Thu, 2010-09-16 at 18:56 -0700, Venkatesh Pallipadi wrote:
>> +++ b/kernel/sched.c
>> @@ -2025,6 +2025,18 @@ static u64 unaccount_irq_delta(u64 delta, int cpu, u64 *saved_irq_time)
>> #define unaccount_irq_delta_rt(delta, cpu, class_rq) \
>> unaccount_irq_delta(delta, cpu, &(class_rq)->saved_irq_time)
>>
>> +static void sched_irq_power_update_fair(int cpu, struct cfs_rq *cfs_rq,
>> + struct rq* rq)
>> +{
>> + if (!sched_clock_irqtime)
>> + return;
>> +
>> + if (likely(rq->total_irq_time > cfs_rq->saved_irq_time)) {
>> + sched_rt_avg_update(rq,
>> + rq->total_irq_time - cfs_rq->saved_irq_time);
>> + }
>> +}
>> +
>> #else
>>
>> #define update_irq_time(cpu, crq) do { } while (0)
>> @@ -2042,6 +2054,8 @@ static u64 unaccount_irq_delta_rt(u64 delta_exec, int cpu, struct rt_rq *rt_rq)
>> return delta_exec;
>> }
>>
>> +#define sched_irq_power_update_fair(cpu, crq, rq) do { } while (0)
>> +
>> #endif
>>
>> #include "sched_idletask.c"
>> diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
>> index a64fdaf..937fded 100644
>> --- a/kernel/sched_fair.c
>> +++ b/kernel/sched_fair.c
>> @@ -526,6 +526,9 @@ static void update_curr(struct cfs_rq *cfs_rq)
>> if (unlikely(!curr))
>> return;
>>
>> + if (sched_feat(NONIRQ_POWER) && entity_is_task(curr))
>> + sched_irq_power_update_fair(cpu, cfs_rq, rq_of(cfs_rq));
>> +
>> /*
>> * Get the amount of time the current task was running
>> * since the last time we changed load (this cannot
>
> This all looks very confusing to me,.. How about we simply fold the
> delta between rq->clock and rq->clock_task into sched_rt_avg_update()
> and be done with it?
>
rq->clock and rq->clock_task: As I understood, you mean having both
being continuous counters since boot. So, we will still need some
"rt_avg_accounted irq_time" that will be updated when
sched_rt_avg_update() is done. Or am I missing something?
Thanks.
Venki
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