From: Alex Shi <alex.shi@intel.com>
To: Namhyung Kim <namhyung@kernel.org>
Cc: mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de,
akpm@linux-foundation.org, arjan@linux.intel.com, bp@alien8.de,
pjt@google.com, efault@gmx.de, vincent.guittot@linaro.org,
gregkh@linuxfoundation.org, preeti@linux.vnet.ibm.com,
viresh.kumar@linaro.org, linux-kernel@vger.kernel.org
Subject: Re: [patch v6 10/21] sched: get rq potential maximum utilization
Date: Tue, 02 Apr 2013 21:38:09 +0800 [thread overview]
Message-ID: <515ADF41.8070207@intel.com> (raw)
In-Reply-To: <87a9phfgox.fsf@sejong.aot.lge.com>
>> + nr_running = rq->nr_running ? rq->nr_running : 1;
>
> This can be cleaned up with proper min/max().
yes, thanks
>
>> +
>> + return rt_util + cfs_util * nr_running;
>
> Should this nr_running consider tasks in cfs_rq only? Also it seems
> there's no upper bound so that it can possibly exceed FULL_UTIL.
Yes.
we need to consider task number:nr_running, otherwise cpu utilization
will never beyond FULL_UTIL, then we can not know if the cpu is overload.
So we need the possible maximum utilization bigger than FULL_UTIL.
>
--
Thanks
Alex
next prev parent reply other threads:[~2013-04-02 13:38 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-30 14:34 [patch v6 0/21] sched: power aware scheduling Alex Shi
2013-03-30 14:34 ` [patch v6 01/21] Revert "sched: Introduce temporary FAIR_GROUP_SCHED dependency for load-tracking" Alex Shi
2013-03-30 14:34 ` [patch v6 02/21] sched: set initial value of runnable avg for new forked task Alex Shi
2013-03-30 14:34 ` [patch v6 03/21] sched: only count runnable avg on cfs_rq's nr_running Alex Shi
2013-04-02 14:30 ` Vincent Guittot
2013-04-03 1:02 ` Alex Shi
2013-04-03 1:23 ` Paul Turner
2013-04-03 2:12 ` Alex Shi
2013-03-30 14:34 ` [patch v6 04/21] sched: add sched balance policies in kernel Alex Shi
2013-03-30 14:34 ` [patch v6 05/21] sched: add sysfs interface for sched_balance_policy selection Alex Shi
2013-03-30 14:34 ` [patch v6 06/21] sched: log the cpu utilization at rq Alex Shi
2013-03-30 14:34 ` [patch v6 07/21] sched: add new sg/sd_lb_stats fields for incoming fork/exec/wake balancing Alex Shi
2013-03-30 14:34 ` [patch v6 08/21] sched: move sg/sd_lb_stats struct ahead Alex Shi
2013-03-30 14:34 ` [patch v6 09/21] sched: scale_rt_power rename and meaning change Alex Shi
2013-03-30 14:34 ` [patch v6 10/21] sched: get rq potential maximum utilization Alex Shi
2013-04-02 9:02 ` Namhyung Kim
2013-04-02 13:38 ` Alex Shi [this message]
2013-04-03 2:15 ` Alex Shi
2013-04-03 2:22 ` Paul Turner
2013-04-03 2:35 ` Alex Shi
2013-04-03 8:07 ` Alex Shi
2013-04-02 14:38 ` Vincent Guittot
2013-04-03 1:11 ` Alex Shi
2013-03-30 14:34 ` [patch v6 11/21] sched: detect wakeup burst with rq->avg_idle Alex Shi
2013-04-03 8:12 ` Alex Shi
2013-03-30 14:34 ` [patch v6 12/21] sched: add power aware scheduling in fork/exec/wake Alex Shi
2013-04-01 9:50 ` Preeti U Murthy
2013-04-01 13:43 ` Alex Shi
2013-03-30 14:35 ` [patch v6 13/21] sched: using avg_idle to detect bursty wakeup Alex Shi
2013-04-03 5:08 ` Namhyung Kim
2013-04-03 5:41 ` Alex Shi
2013-04-03 8:10 ` Alex Shi
2013-03-30 14:35 ` [patch v6 14/21] sched: packing transitory tasks in wakeup power balancing Alex Shi
2013-03-30 14:35 ` [patch v6 15/21] sched: add power/performance balance allow flag Alex Shi
2013-03-30 14:35 ` [patch v6 16/21] sched: pull all tasks from source group Alex Shi
2013-03-30 14:35 ` [patch v6 17/21] sched: no balance for prefer_sibling in power scheduling Alex Shi
2013-03-30 14:35 ` [patch v6 18/21] sched: add new members of sd_lb_stats Alex Shi
2013-03-30 14:35 ` [patch v6 19/21] sched: power aware load balance Alex Shi
2013-03-30 14:35 ` [patch v6 20/21] sched: lazy power balance Alex Shi
2013-03-30 14:35 ` [patch v6 21/21] sched: don't do power balance on share cpu power domain Alex Shi
2013-04-01 5:05 ` [patch v6 0/21] sched: power aware scheduling Michael Wang
2013-04-01 6:17 ` Alex Shi
2013-04-01 6:20 ` Alex Shi
2013-04-03 8:17 ` Alex Shi
2013-04-04 0:57 ` Alex Shi
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