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From: Tejun Heo <tj@kernel.org>
To: Li Zefan <lizefan@huawei.com>
Cc: LKML <linux-kernel@vger.kernel.org>, cgroups <cgroups@vger.kernel.org>
Subject: Re: [PATCH v3 12/12] cpuset: export effective masks to userspace
Date: Wed, 9 Jul 2014 16:15:49 -0400	[thread overview]
Message-ID: <20140709201549.GD21090@htj.dyndns.org> (raw)
In-Reply-To: <53BD0215.8060305@huawei.com>

On Wed, Jul 09, 2014 at 04:49:25PM +0800, Li Zefan wrote:
> cpuset.cpus and cpuset.mems are the configured masks, and we need
> to export effective masks to userspace, so users know the real
> cpus_allowed and mems_allowed that apply to the tasks in a cpuset.
> 
> v2:
> - export those masks unconditionally, suggested by Tejun.
> 
> Signed-off-by: Li Zefan <lizefan@huawei.com>

I applied this patch but there's a pending patchset to split legacy
and dfl cftype arrays, so maybe doing it separately makes more sense
now, I'm not sure.  Anyways, we need to review cpuset interface for
the default hierarchy anyway.  At least the memory pressure knobs
should go.  It's measuring something which is completely
implementation dependent.

Thanks.

-- 
tejun

WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Cc: LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	cgroups <cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH v3 12/12] cpuset: export effective masks to userspace
Date: Wed, 9 Jul 2014 16:15:49 -0400	[thread overview]
Message-ID: <20140709201549.GD21090@htj.dyndns.org> (raw)
In-Reply-To: <53BD0215.8060305-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>

On Wed, Jul 09, 2014 at 04:49:25PM +0800, Li Zefan wrote:
> cpuset.cpus and cpuset.mems are the configured masks, and we need
> to export effective masks to userspace, so users know the real
> cpus_allowed and mems_allowed that apply to the tasks in a cpuset.
> 
> v2:
> - export those masks unconditionally, suggested by Tejun.
> 
> Signed-off-by: Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>

I applied this patch but there's a pending patchset to split legacy
and dfl cftype arrays, so maybe doing it separately makes more sense
now, I'm not sure.  Anyways, we need to review cpuset interface for
the default hierarchy anyway.  At least the memory pressure knobs
should go.  It's measuring something which is completely
implementation dependent.

Thanks.

-- 
tejun

  reply	other threads:[~2014-07-09 20:15 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-09  8:46 [PATCH v3 00/12] cpuset: separate configured masks and effective masks Li Zefan
2014-07-09  8:47 ` [PATCH v3 01/12] cpuset: add cs->effective_cpus and cs->effective_mems Li Zefan
2014-07-09 16:47   ` Tejun Heo
2014-07-09 16:47     ` Tejun Heo
2014-07-09  8:47 ` [PATCH v3 02/12] cpuset: update cpuset->effective_{cpus,mems} at hotplug Li Zefan
2014-07-09  8:47 ` [PATCH v3 03/12] cpuset: update cs->effective_{cpus,mems} when config changes Li Zefan
2014-07-09 19:57   ` Tejun Heo
2014-07-09 19:57     ` Tejun Heo
2014-07-09  8:47 ` [PATCH v3 04/12] cpuset: inherit ancestor's masks if effective_{cpus,mems} becomes empty Li Zefan
2014-07-09  8:47 ` [PATCH v3 05/12] cpuset: use effective cpumask to build sched domains Li Zefan
2014-07-09 19:18   ` Tejun Heo
2014-07-09  8:48 ` [PATCH v3 06/12] cpuset: initialize top_cpuset's configured masks at mount Li Zefan
2014-07-09  8:48   ` Li Zefan
2014-07-09  8:48 ` [PATCH v3 07/12] cpuset: apply cs->effective_{cpus,mems} Li Zefan
2014-07-09  8:48 ` [PATCH v3 08/12] cpuset: make cs->{cpus,mems}_allowed as user-configured masks Li Zefan
2014-07-09  8:48 ` [PATCH v3 09/12] cpuset: refactor cpuset_hotplug_update_tasks() Li Zefan
2014-07-09  8:49 ` [PATCH v3 10/12] cpuset: enable onlined cpu/node in effective masks Li Zefan
2014-07-09  8:49 ` [PATCH v3 11/12] cpuset: allow writing offlined masks to cpuset.cpus/mems Li Zefan
2014-07-09  8:49 ` [PATCH v3 12/12] cpuset: export effective masks to userspace Li Zefan
2014-07-09 20:15   ` Tejun Heo [this message]
2014-07-09 20:15     ` Tejun Heo
2014-07-09 20:24     ` Tejun Heo
2014-07-09 20:24       ` Tejun Heo
2014-07-09 20:12 ` [PATCH v3 00/12] cpuset: separate configured masks and effective masks Tejun Heo
2014-07-09 20:12   ` Tejun Heo

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