From: Vincent Guittot <vincent.guittot@linaro.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Morten Rasmussen <Morten.Rasmussen@arm.com>,
Yuyang Du <yuyang.du@intel.com>, Paul Turner <pjt@google.com>,
Ben Segall <bsegall@google.com>
Subject: Re: [PATCH v2] sched/fair: update scale invariance of PELT
Date: Tue, 2 May 2017 15:38:12 +0200 [thread overview]
Message-ID: <CAKfTPtA6aLm==_F9Zmo+4zHQks52nKyo8R7m1=zbYtWLQNeOvQ@mail.gmail.com> (raw)
In-Reply-To: <20170501090026.kht6tsttn6dirbrw@hirez.programming.kicks-ass.net>
On 1 May 2017 at 11:00, Peter Zijlstra <peterz@infradead.org> wrote:
> On Sat, Apr 29, 2017 at 12:09:24AM +0200, Peter Zijlstra wrote:
>> On Mon, Apr 10, 2017 at 11:18:29AM +0200, Vincent Guittot wrote:
>> > +++ b/include/linux/sched.h
>> > @@ -313,6 +313,7 @@ struct load_weight {
>> > */
>> > struct sched_avg {
>> > u64 last_update_time;
>> > + u64 stolen_idle_time;
>> > u64 load_sum;
>> > u32 util_sum;
>> > u32 period_contrib;
>>
>> > + if (sa->util_sum < (LOAD_AVG_MAX * 1000)) {
>> > + /*
>> > + * Add the idle time stolen by running at lower compute
>> > + * capacity
>> > + */
>> > + delta += sa->stolen_idle_time;
>> > + }
>> > + sa->stolen_idle_time = 0;
>>
>>
>> So I was wondering if stolen_idle_time really needs to be a u64. Afaict
>> we'll be at LOAD_AVG_MAX after LOAD_AVG_MAX_N periods, or LOAD_AVG_MAX_N
>> * LOAD_AVG_PERIOD time, which ends up being 11040.
>
> * 1024 or course, but still easily fits in u32.
Correct
>
prev parent reply other threads:[~2017-05-02 13:38 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-10 9:18 [PATCH v2] sched/fair: update scale invariance of PELT Vincent Guittot
2017-04-10 17:38 ` Peter Zijlstra
2017-04-11 7:52 ` Vincent Guittot
2017-04-11 8:53 ` Peter Zijlstra
2017-04-11 9:40 ` Vincent Guittot
2017-04-11 10:41 ` Peter Zijlstra
2017-04-11 10:49 ` Peter Zijlstra
2017-04-11 13:09 ` Vincent Guittot
2017-04-12 11:28 ` Peter Zijlstra
2017-04-12 14:50 ` Vincent Guittot
2017-04-12 15:44 ` Peter Zijlstra
2017-04-13 9:42 ` Vincent Guittot
2017-04-13 13:32 ` Peter Zijlstra
2017-04-13 14:59 ` Vincent Guittot
2017-04-13 18:06 ` Peter Zijlstra
2017-04-14 8:47 ` Vincent Guittot
2017-04-11 12:08 ` Vincent Guittot
2017-04-11 9:12 ` Peter Zijlstra
2017-04-11 9:46 ` Vincent Guittot
2017-04-13 13:39 ` Peter Zijlstra
2017-04-13 15:16 ` Vincent Guittot
2017-04-13 16:13 ` Peter Zijlstra
2017-04-14 8:49 ` Vincent Guittot
2017-04-19 16:31 ` Vincent Guittot
2017-04-28 15:52 ` Morten Rasmussen
2017-04-28 17:08 ` Dietmar Eggemann
2017-05-03 17:11 ` Vincent Guittot
2017-04-28 22:09 ` Peter Zijlstra
2017-05-01 9:00 ` Peter Zijlstra
2017-05-02 13:38 ` Vincent Guittot [this message]
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