Message-ID: <4A2C7927.30709@cn.fujitsu.com>
Date: Mon, 08 Jun 2009 10:36:23 +0800
From: Lai Jiangshan <laijs@cn.fujitsu.com>
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To: Andrew Morton <akpm@linux-foundation.org>, Oleg Nesterov <oleg@redhat.com>
CC: paulmck@linux.vnet.ibm.com, Gautham R Shenoy <ego@in.ibm.com>,
       Rusty Russell <rusty@rustcorp.com.au>, Ingo Molnar <mingo@elte.hu>,
       LKML <linux-kernel@vger.kernel.org>,
       Peter Zijlstra <peterz@infradead.org>, dipankar@in.ibm.com
Subject: Re: [PATCH] cpuhotplug: introduce try_get_online_cpus() take 2
References: <4A1F9CEA.1070705@cn.fujitsu.com> <20090530015342.GA21502@linux.vnet.ibm.com> <20090530043739.GA12157@in.ibm.com> <4A27708C.6030703@cn.fujitsu.com> <20090605153714.GB6778@linux.vnet.ibm.com>
In-Reply-To: <20090605153714.GB6778@linux.vnet.ibm.com>
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Paul E. McKenney wrote:
>> Add CC to Peter Zijlstra <peterz@infradead.org>
>>
>> (This patch is against mainline but not for inclusion, it will adapted
>> against -mm when request)
>>
>> Requst For Comments and Reviewing Hungeringly.
>>
>> - Lockless for get_online_cpus()'s fast path
>> - Introduce try_get_online_cpus()
> 
> One question for Gautham Shenoy -- are non-atomic CPU-hotplug notifiers
> always invoked from the task that did the cpu_hotplug_begin()?
> 
> If so, well and good.  If not, then it would not be possible to
> expedite RCU grace periods from within CPU-hotplug notifiers.
> 
> 							Thanx, Paul
> 


I have no proper machine for several days to test the next version
of this patch, so it is still being delayed a while.

Lai.


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