From: Alex Shi <alex.shi@linaro.org>
To: Michael wang <wangyun@linux.vnet.ibm.com>,
mingo@redhat.com, peterz@infradead.org, morten.rasmussen@arm.com
Cc: vincent.guittot@linaro.org, daniel.lezcano@linaro.org,
fweisbec@gmail.com, linux@arm.linux.org.uk, tony.luck@intel.com,
fenghua.yu@intel.com, james.hogan@imgtec.com, jason.low2@hp.com,
viresh.kumar@linaro.org, hanjun.guo@linaro.org,
linux-kernel@vger.kernel.org, tglx@linutronix.de,
akpm@linux-foundation.org, arjan@linux.intel.com, pjt@google.com,
fengguang.wu@intel.com, linaro-kernel@lists.linaro.org
Subject: Re: [PATCH v2 0/11] remove cpu_load in rq
Date: Tue, 18 Feb 2014 14:03:35 +0800 [thread overview]
Message-ID: <5302F7B7.60802@linaro.org> (raw)
In-Reply-To: <5302E6FA.508@linux.vnet.ibm.com>
On 02/18/2014 12:52 PM, Michael wang wrote:
> On 02/17/2014 09:55 AM, Alex Shi wrote:
>> The cpu_load decays on time according past cpu load of rq. The sched_avg also decays tasks' load on time. Now we has 2 kind decay for cpu_load. That is a kind of redundancy. And increase the system load by decay calculation. This patch try to remove the cpu_load decay.
>>
>> There are 5 load_idx used for cpu_load in sched_domain. busy_idx and idle_idx are not zero usually, but newidle_idx, wake_idx and forkexec_idx are all zero on every arch. A shortcut to remove cpu_Load decay in the first patch. just one line patch for this change.
>>
>> V2,
>> 1, This version do some tuning on load bias of target load, to maximum match current code logical.
>> 2, Got further to remove the cpu_load in rq.
>> 3, Revert the patch 'Limit sd->*_idx range on sysctl' since no needs
>>
>> Any testing/comments are appreciated.
>
> Tested on 12-cpu-x86 box with tip/master, ebizzy and hackbench
> works fine, show little improvements for each time's testing.
Thanks a lot for your data!
>
>
> BTW, I got panic while rebooting, but should not caused by
> this patch set, will recheck and post the report later.
>
I reviewed my patch again. Also didn't find suspicious line for the
following rcu stall. Will wait for your report. :)
>
--
Thanks
Alex
next prev parent reply other threads:[~2014-02-18 6:03 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-17 1:55 [PATCH v2 0/11] remove cpu_load in rq Alex Shi
2014-02-17 1:55 ` [PATCH v2 01/11] sched: shortcut to remove load_idx Alex Shi
2014-02-17 1:55 ` [PATCH v2 02/11] sched: remove rq->cpu_load[load_idx] array Alex Shi
2014-02-17 1:55 ` [PATCH v2 03/11] sched: clean up cpu_load update Alex Shi
2014-02-17 1:55 ` [PATCH v2 04/11] sched: unify imbalance bias for target group Alex Shi
2014-02-17 1:55 ` [PATCH v2 05/11] sched: rewrite update_cpu_load_nohz Alex Shi
2014-02-17 1:55 ` [PATCH v2 06/11] sched: clean up source_load/target_load Alex Shi
2014-02-17 1:55 ` [PATCH v2 07/11] sched: clean up weighted_cpuload Alex Shi
2014-02-17 1:55 ` [PATCH v2 08/11] sched: remove weighted_load() Alex Shi
2014-02-17 1:55 ` [PATCH v2 09/11] sched: remove rq->cpu_load and rq->nr_load_updates Alex Shi
2014-02-17 1:55 ` [PATCH v2 10/11] sched: rename update_*_cpu_load Alex Shi
2014-02-17 1:55 ` [PATCH v2 11/11] sched: clean up task_hot function Alex Shi
2014-02-18 2:37 ` [PATCH v2 0/11] remove cpu_load in rq Alex Shi
2014-02-18 4:52 ` Michael wang
2014-02-18 6:03 ` Alex Shi [this message]
2014-02-18 6:17 ` Michael wang
[not found] ` <20140218120522.GG19029@e103034-lin>
2014-02-18 12:28 ` Vincent Guittot
2014-02-19 10:23 ` Alex Shi
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