From: Robin Holt <holt@sgi.com>
To: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Robin Holt <holt@sgi.com>, Ingo Molnar <mingo@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Russ Anderson <rja@sgi.com>,
Shawn Guo <shawn.guo@linaro.org>, Oleg Nesterov <oleg@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
"H. Peter Anvin" <hpa@zytor.com>, Joe Perches <joe@perches.com>,
Lai Jiangshan <laijs@cn.fujitsu.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Michel Lespinasse <walken@google.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Paul Mackerras <paulus@samba.org>,
Peter Zijlstra <peterz@infradead.org>,
"rusty@rustcorp.com.au" <rusty@rustcorp.com.au>,
Tejun Heo <tj@kernel.org>,
the arch/x86 maintainers <x86@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [Patch -v4 1/4] Migrate shutdown/reboot to boot cpu.
Date: Wed, 17 Apr 2013 06:58:20 -0500 [thread overview]
Message-ID: <20130417115820.GF3658@sgi.com> (raw)
In-Reply-To: <516E880C.9050402@linux.vnet.ibm.com>
> The get/put_online_cpus() doesn't help in this case, because if a
> hotplug operation is started _after_ this function returns, then
> your task will get force migrated - which makes the get/put_online_cpus()
> pointless. What we need to do is *disable* CPU hotplug altogether.
> We need not even enable it back, since we are rebooting/powering off
> anyway.
>
> So how about using the following patch in your series and using
> cpu_hotplug_disable() to achieve the goal?
I will incorporate it before my patch and utilize. Thank you very
much as I was at a loss as to what I should be doing.
Robin
prev parent reply other threads:[~2013-04-17 11:58 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-16 9:58 [Patch -v4 1/4] Migrate shutdown/reboot to boot cpu Robin Holt
2013-04-16 11:32 ` Ingo Molnar
2013-04-16 12:06 ` Robin Holt
2013-04-16 14:01 ` Robin Holt
2013-04-17 7:46 ` Ingo Molnar
2013-04-17 9:27 ` Borislav Petkov
2013-04-19 7:56 ` Ingo Molnar
2013-04-19 8:29 ` Srivatsa S. Bhat
2013-04-19 8:44 ` Ingo Molnar
2013-04-16 15:48 ` Srivatsa S. Bhat
2013-04-16 16:22 ` Robin Holt
2013-04-17 7:48 ` Ingo Molnar
2013-04-17 10:03 ` Robin Holt
2013-04-17 11:31 ` Srivatsa S. Bhat
2013-04-17 11:58 ` Robin Holt [this message]
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