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From: Alex Shi <alex.shi@intel.com>
To: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de,
	akpm@linux-foundation.org, arjan@linux.intel.com, bp@alien8.de,
	pjt@google.com, namhyung@kernel.org, efault@gmx.de,
	morten.rasmussen@arm.com, vincent.guittot@linaro.org,
	gregkh@linuxfoundation.org, viresh.kumar@linaro.org,
	linux-kernel@vger.kernel.org, len.brown@intel.com,
	rafael.j.wysocki@intel.com, jkosina@suse.cz,
	clark.williams@gmail.com, tony.luck@intel.com,
	keescook@chromium.org, mgorman@suse.de, riel@redhat.com
Subject: Re: [patch v7 20/21] sched: don't do power balance on share cpu power domain
Date: Mon, 08 Apr 2013 12:19:23 +0800	[thread overview]
Message-ID: <5162454B.2050502@intel.com> (raw)
In-Reply-To: <5162389F.4020208@linux.vnet.ibm.com>

On 04/08/2013 11:25 AM, Preeti U Murthy wrote:
> Hi Alex,
> 
> I am sorry I overlooked the changes you have made to the power
> scheduling policies.Now you have just two : performance and powersave.
> 
> Hence you can ignore my below comments.But if you use group->capacity
> instead of group->weight for threshold,like you did for balance policy
> in your version5 of this patchset, dont you think the below patch can be
> avoided? group->capacity being the threshold will automatically ensure
> that you dont pack onto domains that share cpu power.


this patch is different from balance policy, the powersave still try to
move 2 busy tasks into one cpu core on Intel cpu. It is just don't keep
packing in cpu core, like if there are 2 half busy tasks in one cpu
core, with this patch, each of SMT thread has one half busy task,
without this patch, 2 half busy task are packed into one thread.

The removed balance policy just pack one busy task per cpu core.  Yes,
the 'balance' policy has its meaning. but that is different.

-- 
Thanks Alex

  reply	other threads:[~2013-04-08  4:20 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-04-04  2:00 [patch v7 0/21] sched: power aware scheduling Alex Shi
2013-04-04  2:00 ` [patch v7 01/21] Revert "sched: Introduce temporary FAIR_GROUP_SCHED dependency for load-tracking" Alex Shi
2013-04-04  2:00 ` [patch v7 02/21] sched: set initial value of runnable avg for new forked task Alex Shi
2013-05-06  3:24   ` Preeti U Murthy
2013-04-04  2:00 ` [patch v7 03/21] sched: add sched balance policies in kernel Alex Shi
2013-04-04  2:00 ` [patch v7 04/21] sched: add sysfs interface for sched_balance_policy selection Alex Shi
2013-04-04  2:00 ` [patch v7 05/21] sched: log the cpu utilization at rq Alex Shi
2013-05-06  3:26   ` Preeti U Murthy
2013-05-06  5:22     ` Alex Shi
2013-05-06 12:03   ` Phil Carmody
2013-05-06 12:35     ` Alex Shi
2013-05-06 21:19   ` Paul Turner
2013-04-04  2:00 ` [patch v7 06/21] sched: add new sg/sd_lb_stats fields for incoming fork/exec/wake balancing Alex Shi
2013-04-04  2:00 ` [patch v7 07/21] sched: move sg/sd_lb_stats struct ahead Alex Shi
2013-04-04  2:00 ` [patch v7 08/21] sched: scale_rt_power rename and meaning change Alex Shi
2013-04-04  2:00 ` [patch v7 09/21] sched: get rq potential maximum utilization Alex Shi
2013-04-04  2:00 ` [patch v7 10/21] sched: add power aware scheduling in fork/exec/wake Alex Shi
2013-04-04  2:00 ` [patch v7 11/21] sched: add sched_burst_threshold_ns as wakeup burst indicator Alex Shi
2013-04-04  2:00 ` [patch v7 12/21] sched: using avg_idle to detect bursty wakeup Alex Shi
2013-04-04  2:00 ` [patch v7 13/21] sched: packing transitory tasks in wakeup power balancing Alex Shi
2013-04-04  2:00 ` [patch v7 14/21] sched: add power/performance balance allow flag Alex Shi
2013-04-04  2:00 ` [patch v7 15/21] sched: pull all tasks from source group Alex Shi
2013-04-04  5:59   ` Namhyung Kim
2013-04-06 11:49     ` Alex Shi
2013-04-04  2:00 ` [patch v7 16/21] sched: no balance for prefer_sibling in power scheduling Alex Shi
2013-05-06  3:26   ` Preeti U Murthy
2013-04-04  2:00 ` [patch v7 17/21] sched: add new members of sd_lb_stats Alex Shi
2013-04-04  2:00 ` [patch v7 18/21] sched: power aware load balance Alex Shi
2013-04-04  2:01 ` [patch v7 19/21] sched: lazy power balance Alex Shi
2013-04-04  2:01 ` [patch v7 20/21] sched: don't do power balance on share cpu power domain Alex Shi
2013-04-08  3:17   ` Preeti U Murthy
2013-04-08  3:25     ` Preeti U Murthy
2013-04-08  4:19       ` Alex Shi [this message]
2013-04-04  2:01 ` [patch v7 21/21] sched: make sure select_tas_rq_fair get a cpu Alex Shi
2013-04-11 21:02 ` [patch v7 0/21] sched: power aware scheduling Len Brown
2013-04-12  8:46   ` Alex Shi
2013-04-12 16:23     ` Borislav Petkov
2013-04-12 16:48       ` Mike Galbraith
2013-04-12 17:12         ` Borislav Petkov
2013-04-14  1:36           ` Alex Shi
2013-04-17 21:53         ` Len Brown
2013-04-18  1:51           ` Mike Galbraith
2013-04-26 15:11           ` Mike Galbraith
2013-04-30  5:16             ` Mike Galbraith
2013-04-30  8:30               ` Mike Galbraith
2013-04-30  8:41                 ` Ingo Molnar
2013-04-30  9:35                   ` Mike Galbraith
2013-04-30  9:49                     ` Mike Galbraith
2013-04-30  9:56                       ` Mike Galbraith
2013-05-17  8:06                         ` Preeti U Murthy
2013-05-20  1:01                           ` Alex Shi
2013-05-20  2:30                             ` Preeti U Murthy
2013-04-14  1:28       ` Alex Shi
2013-04-14  5:10         ` Alex Shi
2013-04-14 15:59         ` Borislav Petkov
2013-04-15  6:04           ` Alex Shi
2013-04-15  6:16             ` Alex Shi
2013-04-15  9:52               ` Borislav Petkov
2013-04-15 13:50                 ` Alex Shi
2013-04-15 23:12                   ` Borislav Petkov
2013-04-16  0:22                     ` Alex Shi
2013-04-16 10:24                       ` Borislav Petkov
2013-04-17  1:18                         ` Alex Shi
2013-04-17  7:38                           ` Borislav Petkov

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