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From: Ingo Molnar <mingo@elte.hu>
To: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
	paul@paulmenage.org, rjw@sisk.pl, tj@kernel.org,
	frank.rowand@am.sony.com, pjt@google.com, tglx@linutronix.de,
	lizf@cn.fujitsu.com, prashanth@linux.vnet.ibm.com,
	paulmck@linux.vnet.ibm.com, vatsa@linux.vnet.ibm.com,
	linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>
Subject: Re: [PATCH 0/4] CPU hotplug, cpusets: Fix CPU online handling related to cpusets
Date: Thu, 9 Feb 2012 08:57:01 +0100	[thread overview]
Message-ID: <20120209075701.GE18387@elte.hu> (raw)
In-Reply-To: <4F32174E.2050207@linux.vnet.ibm.com>


* Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> wrote:

> IOW, consider:
> 
> cpuset A has 0-10
> 
> - Take CPU 10 offline
>   [We are forced to remove CPU 10 from cpuset A, which becomes 0-9 now]
> 
> 
>    <Userspace didn't request any change to cpuset A>
> 
> 
> - Bring back CPU 10 online
> 
> Now cpuset A is still 0-9! IMO, it should have been 0-10.

Why is CPU 10 taken out of the cpuset to begin with?

The cpuset code should be fixed to work with offline CPUs as 
well - it can obviously not schedule to them, but otherwise it 
should be fine to have a wider cpuset than the hw can support.

Thanks,

	Ingo

  reply	other threads:[~2012-02-09  7:57 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-07 18:55 Srivatsa S. Bhat
2012-02-07 18:56 ` [PATCH 1/4] CPU hotplug, cpuset: Maintain a copy of the cpus_allowed mask before CPU hotplug Srivatsa S. Bhat
2012-02-07 18:56 ` [PATCH 2/4] cpuset: Split up update_cpumask() so that its functionality can be reused Srivatsa S. Bhat
2012-02-07 18:57 ` [PATCH 3/4] cpuset: Add function to introduce CPUs to cpusets during CPU online Srivatsa S. Bhat
2012-02-07 18:57 ` [PATCH 4/4] CPU hotplug, cpusets: Differentiate the CPU online and CPU offline callbacks Srivatsa S. Bhat
2012-02-08  3:22 ` [PATCH 0/4] CPU hotplug, cpusets: Fix CPU online handling related to cpusets Peter Zijlstra
2012-02-08  6:33   ` Srivatsa S. Bhat
2012-02-09  7:57     ` Ingo Molnar [this message]
2012-02-09  8:42       ` Srivatsa S. Bhat
2012-02-09 15:11         ` Ingo Molnar
2012-02-10 15:52           ` Peter Zijlstra
2012-02-10 16:53             ` Paul E. McKenney
2012-02-10 17:34               ` Peter Zijlstra
2012-02-10 21:51                 ` Alan Stern
2012-02-10 22:39                   ` Rafael J. Wysocki
2012-02-11  2:07                     ` Peter Zijlstra
2012-02-11  4:26                       ` Srivatsa S. Bhat
2012-02-13 17:47                         ` Srivatsa S. Bhat
2012-02-17 12:15                           ` Srivatsa S. Bhat
2012-02-20 12:49                             ` Peter Zijlstra
2012-02-20 12:59                               ` Srivatsa S. Bhat
2012-02-23  9:57                                 ` Srivatsa S. Bhat
2012-02-24 23:24                                   ` Rafael J. Wysocki
2012-02-27 10:18                                   ` Peter Zijlstra
2012-02-27 12:09                                   ` [tip:sched/urgent] CPU hotplug, cpusets, suspend: Don' t touch cpusets during suspend/resume tip-bot for Srivatsa S. Bhat
2012-02-11 16:00                 ` [PATCH 0/4] CPU hotplug, cpusets: Fix CPU online handling related to cpusets Paul E. McKenney
2012-02-13 17:47               ` Srivatsa S. Bhat
2012-02-13 20:39                 ` Paul E. McKenney
2012-02-13 20:49                   ` Srivatsa S. Bhat
2012-02-11 13:39             ` Ingo Molnar
2012-02-10 15:53         ` Peter Zijlstra
2012-02-09 16:43     ` Peter Zijlstra

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