From: Rik van Riel <riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org,
Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
Clark Williams <williams-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Luiz Capitulino
<lcapitulino-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
David Rientjes <rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Mike Galbraith
<umgwanakikbuti-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH 3/4] cpusets,isolcpus: add file to show isolated cpus in cpuset
Date: Wed, 18 Mar 2015 19:40:15 -0400 [thread overview]
Message-ID: <550A0CDF.1060709@redhat.com> (raw)
In-Reply-To: <20150318164745.GA21564-piEFEHQLUPpN0TnZuCh8vA@public.gmane.org>
On 03/18/2015 12:47 PM, Tejun Heo wrote:
> On Mon, Mar 09, 2015 at 12:12:09PM -0400, riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org wrote:
>> From: Rik van Riel <riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>>
>> 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.
Li?
--
All rights reversed
next prev parent reply other threads:[~2015-03-18 23:40 UTC|newest]
Thread overview: 14+ 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-H+wXaHxf7aLQT0dZR+AlfA
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
[not found] ` <1425917530-1771-4-git-send-email-riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-03-18 16:47 ` Tejun Heo
[not found] ` <20150318164745.GA21564-piEFEHQLUPpN0TnZuCh8vA@public.gmane.org>
2015-03-18 23:40 ` Rik van Riel [this message]
2015-03-19 1:50 ` Zefan Li
[not found] ` <550A2B4C.5030705-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2015-03-19 1:54 ` Rik van Riel
[not found] ` <550A2C48.6080807-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-03-19 6:28 ` Zefan Li
2015-03-19 1:45 ` Rik van Riel
[not found] ` <550A2A49.4060704-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-03-19 1:48 ` Tejun Heo
2015-03-09 16:12 ` [PATCH 4/4] cpuset,isolcpus: document relationship between cpusets & isolcpus riel
[not found] ` <1425917530-1771-1-git-send-email-riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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
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