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From: "Michal Koutný" <mkoutny@suse.com>
To: Joel Savitz <jsavitz@redhat.com>
Cc: linux-kernel@vger.kernel.org, Li Zefan <lizefan@huawei.com>,
	Tejun Heo <tj@kernel.org>, Waiman Long <longman@redhat.com>,
	Phil Auld <pauld@redhat.com>,
	cgroups@vger.kernel.org
Subject: Re: [PATCH v2] cpuset: restore sanity to cpuset_cpus_allowed_fallback()
Date: Tue, 21 May 2019 16:34:14 +0200	[thread overview]
Message-ID: <20190521143414.GJ5307@blackbody.suse.cz> (raw)
In-Reply-To: <20190409204003.6428-1-jsavitz@redhat.com>

On Tue, Apr 09, 2019 at 04:40:03PM -0400, Joel Savitz <jsavitz@redhat.com> wrote:
> 	$ grep Cpus /proc/$$/status
> 	Cpus_allowed:	ff
> 	Cpus_allowed_list:	0-7

(a)
 
> 	$ taskset -p 4 $$
> 	pid 19202's current affinity mask: f
> 	pid 19202's new affinity mask: 4
> 
> 	$ grep Cpus /proc/self/status
> 	Cpus_allowed:	04
> 	Cpus_allowed_list:	2
> 
> 	# echo off > /sys/devices/system/cpu/cpu2/online
> 	$ grep Cpus /proc/$$/status
> 	Cpus_allowed:	0b
> 	Cpus_allowed_list:	0-1,3
I'm confused where this value comes from, I must be missing something.

Joel, is the task in question put into a cpuset with 0xf CPUs only (at
point (a))? Or are the CPUs 4-7 offlined as well?

Thanks,
Michal

  parent reply	other threads:[~2019-05-21 14:34 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-09 20:40 Joel Savitz
2019-04-10 16:11 ` Waiman Long
2019-04-10 17:44 ` Phil Auld
2019-05-21 14:34 ` Michal Koutný [this message]
2019-05-24 15:33   ` Joel Savitz
2019-05-28 12:10     ` Michal Koutný
2019-06-13 12:02       ` Michal Koutný
2019-06-13 14:52         ` Joel Savitz

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