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From: Zefan Li <lizefan@huawei.com>
To: Rik van Riel <riel@redhat.com>
Cc: Tejun Heo <tj@kernel.org>, <linux-kernel@vger.kernel.org>,
	<cgroups@vger.kernel.org>, Peter Zijlstra <peterz@infradead.org>,
	"Clark Williams" <williams@redhat.com>,
	Ingo Molnar <mingo@redhat.com>,
	"Luiz Capitulino" <lcapitulino@redhat.com>,
	David Rientjes <rientjes@google.com>,
	Mike Galbraith <umgwanakikbuti@gmail.com>
Subject: Re: [PATCH 3/4] cpusets,isolcpus: add file to show isolated cpus in cpuset
Date: Thu, 19 Mar 2015 14:28:12 +0800	[thread overview]
Message-ID: <550A6C7C.1030204@huawei.com> (raw)
In-Reply-To: <550A2C48.6080807@redhat.com>

On 2015/3/19 9:54, Rik van Riel wrote:
> On 03/18/2015 09:50 PM, Zefan Li wrote:
>> On 2015/3/19 7:40, Rik van Riel wrote:
>>> On 03/18/2015 12:47 PM, Tejun Heo wrote:
>>>> On Mon, Mar 09, 2015 at 12:12:09PM -0400, riel@redhat.com wrote:
>>>>> From: Rik van Riel <riel@redhat.com>
>>>>>
>>>>> The previous patch makes it so the code skips over isolcpus when
>>>>> building scheduler load balancing domains. This makes it hard to
>>>>> see for a user which of the CPUs in a cpuset are participating in
>>>>> load balancing, and which ones are isolated cpus.
>>>>>
>>>>> Add a cpuset.isolcpus file with info on which cpus in a cpuset are
>>>>> isolated CPUs.
>>>>>
>>>>> This file is read-only for now. In the future we could extend things
>>>>> so isolcpus can be changed at run time, for the root (system wide)
>>>>> cpuset only.
>>>>
>>>> Didn't Li say that this is trivially computable from userland?  I'm
>>>> not sure this knob actually belongs to cpuset.
>>>
>>> I don't know whether the information to compute this is
>>> always visible from userland.  I am happy to drop this
>>> patch if Li prefers things that way, though.
>>>
>>
>> What I proposed is adding /sys/devices/system/cpu/isolated. Sysfs is
>> visible in containers, unless specially configured not so.
> 
> OK, are you willing to take patches 1, 2, and the first hunk of patch
> 4 now? I can submit a patch to add /sys/devices/system/cpu/isolated
> on Friday, to the appropriate maintainer.
> 

Other patches look good to me.

> (taking tomorrow off to go hiking on the last full day of winter)
> 

Have a good day!


  reply	other threads:[~2015-03-19  6:28 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-09 16:12 [PATCH v4 RESEND 0/4] cpusets,isolcpus: exclude isolcpus from load balancing in cpusets riel
2015-03-09 16:12 ` [PATCH 1/4] sched,isolcpu: make cpu_isolated_map visible outside scheduler riel
2015-03-09 16:12 ` [PATCH 2/4] cpusets,isolcpus: exclude isolcpus from load balancing in cpusets riel
2015-03-09 16:12 ` [PATCH 3/4] cpusets,isolcpus: add file to show isolated cpus in cpuset riel
2015-03-18 16:47   ` Tejun Heo
2015-03-18 23:40     ` Rik van Riel
2015-03-19  1:50       ` Zefan Li
2015-03-19  1:54         ` Rik van Riel
2015-03-19  6:28           ` Zefan Li [this message]
2015-03-19  1:45     ` Rik van Riel
2015-03-19  1:48       ` Tejun Heo
2015-03-09 16:12 ` [PATCH 4/4] cpuset,isolcpus: document relationship between cpusets & isolcpus riel
2015-03-18 16:13 ` [PATCH v4 RESEND 0/4] cpusets,isolcpus: exclude isolcpus from load balancing in cpusets Rik van Riel
2015-03-19 18:30 ` Tejun Heo
  -- strict thread matches above, loose matches on Subject: below --
2015-03-03 23:00 [PATCH v4 " riel
2015-03-03 23:00 ` [PATCH 3/4] cpusets,isolcpus: add file to show isolated cpus in cpuset riel

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