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From: Wanpeng Li <wanpeng.li@linux.intel.com>
To: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: peterz@infradead.org, mingo@kernel.org, riel@redhat.com,
	daniel.lezcano@linaro.org, vincent.guittot@linaro.org,
	srikar@linux.vnet.ibm.com, pjt@google.com,
	benh@kernel.crashing.org, efault@gmx.de,
	linux-kernel@vger.kernel.org, iamjoonsoo.kim@lge.com,
	svaidy@linux.vnet.ibm.com, tim.c.chen@linux.intel.com,
	morten.rasmussen@arm.com, jason.low2@hp.com,
	Wanpeng Li <wanpeng.li@linux.intel.com>
Subject: Re: [PATCH V2] sched: Improve load balancing in the presence of idle CPUs
Date: Fri, 27 Mar 2015 10:12:01 +0800	[thread overview]
Message-ID: <20150327021201.GA4491@kernel> (raw)
In-Reply-To: <20150326130014.21532.17158.stgit@preeti.in.ibm.com>

Hi Preeti,
On Thu, Mar 26, 2015 at 06:32:44PM +0530, Preeti U Murthy wrote:
>
>1. An ILB CPU was chosen from the first numa domain to trigger nohz idle
>load balancing [Given the experiment, upto 6 CPUs per core could be
>potentially idle in this domain.]
>
>2. However the ILB CPU would call load_balance() on itself before
>initiating nohz idle load balancing.
>
>3. Given cores are SMT8, the ILB CPU had enough opportunities to pull
>tasks from its sibling cores to even out load.
>
>4. Now that the ILB CPU was no longer idle, it would abort nohz idle
>load balancing

I don't see abort nohz idle load balancing when ILB CPU was no longer idle 
in nohz_idle_balance(), could you explain more in details?

Regards,
Wanpeng Li 

  parent reply	other threads:[~2015-03-27  2:30 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-26 13:02 [PATCH V2] sched: Improve load balancing in the presence of idle CPUs Preeti U Murthy
2015-03-26 17:03 ` Jason Low
2015-03-27  2:12 ` Wanpeng Li [this message]
2015-03-27  4:33   ` Preeti U Murthy
2015-03-27  4:23     ` Wanpeng Li
2015-03-27  5:01     ` Jason Low
2015-03-27  5:07   ` Jason Low
2015-03-27  5:39     ` Srikar Dronamraju
2015-03-27  7:00       ` Wanpeng Li
2015-03-27  6:43     ` Wanpeng Li
2015-03-27 16:23     ` Preeti U Murthy
2015-03-27 11:43 ` [tip:sched/core] " tip-bot for Preeti U Murthy
2015-03-27 13:03 ` [PATCH V2] " Srikar Dronamraju
2015-03-27 14:38 ` Morten Rasmussen
2015-03-27 16:46   ` Preeti U Murthy
2015-03-27 17:56     ` Morten Rasmussen
2015-03-30  7:26       ` Preeti U Murthy
2015-03-30 11:30         ` Morten Rasmussen
2015-03-30 11:06       ` Peter Zijlstra
2015-03-30 12:03         ` Morten Rasmussen
2015-03-30 12:24           ` Peter Zijlstra
2015-03-30 12:54             ` Peter Zijlstra
2015-03-30 13:29             ` Vincent Guittot
2015-03-30 14:01               ` Peter Zijlstra
2015-03-30 15:27               ` Morten Rasmussen
2015-03-31  8:58           ` Preeti U Murthy
2015-03-31 17:30             ` Jason Low
2015-04-01  6:28               ` Preeti U Murthy
2015-04-01 13:03                 ` Morten Rasmussen
2015-04-02  0:55                   ` Jason Low
2015-04-02  3:22                   ` Preeti U Murthy
2015-03-30 13:45 ` Vincent Guittot
2015-03-31  8:06   ` Preeti U Murthy

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