From: Alex Shi <alex.shi@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>,
torvalds@linux-foundation.org, mingo@redhat.com,
tglx@linutronix.de, akpm@linux-foundation.org,
arjan@linux.intel.com, bp@alien8.de, pjt@google.com,
namhyung@kernel.org, efault@gmx.de, vincent.guittot@linaro.org,
gregkh@linuxfoundation.org, viresh.kumar@linaro.org,
linux-kernel@vger.kernel.org, morten.rasmussen@arm.com
Subject: Re: [patch v5 06/15] sched: log the cpu utilization at rq
Date: Wed, 20 Feb 2013 22:36:56 +0800 [thread overview]
Message-ID: <5124DF88.5050908@intel.com> (raw)
In-Reply-To: <1361367264.10155.31.camel@laptop>
On 02/20/2013 09:34 PM, Peter Zijlstra wrote:
> On Wed, 2013-02-20 at 17:39 +0530, Preeti U Murthy wrote:
>> Hi,
>>
>>>> /*
>>>> * This is the main, per-CPU runqueue data structure.
>>>> *
>>>> @@ -481,6 +484,7 @@ struct rq {
>>>> #endif
>>>>
>>>> struct sched_avg avg;
>>>> + unsigned int util;
>>>> };
>>>>
>>>> static inline int cpu_of(struct rq *rq)
>>>
>>> You don't actually compute the rq utilization, you only compute the
>>> utilization as per the fair class, so if there's significant RT activity
>>> it'll think the cpu is under-utilized, whihc I think will result in the
>>> wrong thing.
>>
>> Correct me if I am wrong,but isn't the current load balancer also
>> disregarding the real time tasks to calculate the domain/group/cpu level
>> load too?
>
> Nope, the rt utilization affects the cpu_power, thereby correcting the
> weight stuff.
The balance policy use group capacity, that implicated using cpu power,
but seems capacity is a very rough data.
>
>
--
Thanks
Alex
next prev parent reply other threads:[~2013-02-20 14:37 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-18 5:07 [patch v5 0/15] power aware scheduling Alex Shi
2013-02-18 5:07 ` [patch v5 01/15] sched: set initial value for runnable avg of sched entities Alex Shi
2013-02-18 8:28 ` Joonsoo Kim
2013-02-18 9:16 ` Alex Shi
2013-02-18 5:07 ` [patch v5 02/15] sched: set initial load avg of new forked task Alex Shi
2013-02-20 6:20 ` Alex Shi
2013-02-24 10:57 ` Preeti U Murthy
2013-02-25 6:00 ` Alex Shi
2013-02-28 7:03 ` Preeti U Murthy
2013-02-25 7:12 ` Alex Shi
2013-02-18 5:07 ` [patch v5 03/15] Revert "sched: Introduce temporary FAIR_GROUP_SCHED dependency for load-tracking" Alex Shi
2013-02-18 5:07 ` [patch v5 04/15] sched: add sched balance policies in kernel Alex Shi
2013-02-20 9:37 ` Ingo Molnar
2013-02-20 13:40 ` Alex Shi
2013-02-20 15:41 ` Ingo Molnar
2013-02-21 1:43 ` Alex Shi
2013-02-18 5:07 ` [patch v5 05/15] sched: add sysfs interface for sched_balance_policy selection Alex Shi
2013-02-18 5:07 ` [patch v5 06/15] sched: log the cpu utilization at rq Alex Shi
2013-02-20 9:30 ` Peter Zijlstra
2013-02-20 12:09 ` Preeti U Murthy
2013-02-20 13:34 ` Peter Zijlstra
2013-02-20 14:36 ` Alex Shi [this message]
2013-02-20 14:33 ` Alex Shi
2013-02-20 15:20 ` Peter Zijlstra
2013-02-21 1:35 ` Alex Shi
2013-02-20 15:22 ` Peter Zijlstra
2013-02-25 2:26 ` Alex Shi
2013-03-22 8:49 ` Alex Shi
2013-02-20 12:19 ` Preeti U Murthy
2013-02-20 12:39 ` Alex Shi
2013-02-18 5:07 ` [patch v5 07/15] sched: add new sg/sd_lb_stats fields for incoming fork/exec/wake balancing Alex Shi
2013-02-20 9:38 ` Peter Zijlstra
2013-02-20 12:27 ` Alex Shi
2013-02-18 5:07 ` [patch v5 08/15] sched: move sg/sd_lb_stats struct ahead Alex Shi
2013-02-18 5:07 ` [patch v5 09/15] sched: add power aware scheduling in fork/exec/wake Alex Shi
2013-02-20 9:42 ` Peter Zijlstra
2013-02-20 12:09 ` Alex Shi
2013-02-20 13:36 ` Peter Zijlstra
2013-02-20 14:23 ` Alex Shi
2013-02-21 13:33 ` Peter Zijlstra
2013-02-21 14:40 ` Alex Shi
2013-02-22 8:54 ` Peter Zijlstra
2013-02-24 9:27 ` Alex Shi
2013-02-24 9:49 ` Preeti U Murthy
2013-02-24 11:55 ` Alex Shi
2013-02-24 17:51 ` Preeti U Murthy
2013-02-25 2:23 ` Alex Shi
2013-02-25 3:23 ` Mike Galbraith
2013-02-25 9:53 ` Alex Shi
2013-02-25 10:30 ` Mike Galbraith
2013-02-18 5:07 ` [patch v5 10/15] sched: packing transitory tasks in wake/exec power balancing Alex Shi
2013-02-18 8:44 ` Joonsoo Kim
2013-02-18 8:56 ` Alex Shi
2013-02-20 5:55 ` Alex Shi
2013-02-20 7:40 ` Mike Galbraith
2013-02-20 8:11 ` Alex Shi
2013-02-20 8:43 ` Mike Galbraith
2013-02-20 8:54 ` Alex Shi
2013-02-18 5:07 ` [patch v5 11/15] sched: add power/performance balance allow flag Alex Shi
2013-02-20 9:48 ` Peter Zijlstra
2013-02-20 12:04 ` Alex Shi
2013-02-20 13:37 ` Peter Zijlstra
2013-02-20 13:48 ` Peter Zijlstra
2013-02-20 14:08 ` Alex Shi
2013-02-20 13:52 ` Alex Shi
2013-02-20 12:12 ` Borislav Petkov
2013-02-20 14:20 ` Alex Shi
2013-02-20 15:22 ` Borislav Petkov
2013-02-21 1:32 ` Alex Shi
2013-02-21 9:42 ` Borislav Petkov
2013-02-21 14:52 ` Alex Shi
2013-02-18 5:07 ` [patch v5 12/15] sched: pull all tasks from source group Alex Shi
2013-02-18 5:07 ` [patch v5 13/15] sched: no balance for prefer_sibling in power scheduling Alex Shi
2013-02-18 5:07 ` [patch v5 14/15] sched: power aware load balance Alex Shi
2013-03-20 4:57 ` Preeti U Murthy
2013-03-21 7:43 ` Alex Shi
2013-03-21 8:41 ` Preeti U Murthy
2013-03-21 9:27 ` Alex Shi
2013-03-21 10:27 ` Preeti U Murthy
2013-03-22 1:30 ` Alex Shi
2013-03-22 5:14 ` Preeti U Murthy
2013-03-25 4:52 ` Alex Shi
2013-03-29 12:42 ` Preeti U Murthy
2013-03-29 13:39 ` Alex Shi
2013-03-30 11:25 ` Preeti U Murthy
2013-03-30 14:04 ` Alex Shi
2013-03-30 15:31 ` Preeti U Murthy
2013-02-18 5:07 ` [patch v5 15/15] sched: lazy power balance Alex Shi
2013-02-18 7:44 ` [patch v5 0/15] power aware scheduling Alex Shi
2013-02-19 12:08 ` Paul Turner
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