linux-kernel - Re: [RFC][PATCH 0/3] cpuset,mm: fix memory spread bug

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Date:	Wed, 08 Apr 2009 08:56:51 +0800
From:	Miao Xie <miaox@...fujitsu.com>
To:	Christoph Lameter <cl@...ux.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Menage <menage@...gle.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	Yasunori Goto <y-goto@...fujitsu.com>
Subject: Re: [RFC][PATCH 0/3] cpuset,mm: fix memory spread bug

on 2009-4-8 5:04 Christoph Lameter wrote:
> Interesting patch set but I cannot find parts 2 and 3. The locking changes
> get rid of the generation scheme in cpusets which is a good thing if it
> works right.

Sorry for the late reply and my mistake. The following URLs is the patches'
address.

patch 1: restructure the function cpuset_update_task_memory_state()
http://marc.info/?l=linux-kernel&m=123910183705576&w=2

patch 2: update tasks' page/slab spread flags in time
http://marc.info/?l=linux-kernel&m=123910199505770&w=2

patch 3: update tasks' mems_allowed in time
http://marc.info/?l=linux-mm&m=123910199605776&w=2

Thanks
Miao

> 
> On Tue, 7 Apr 2009, Miao Xie wrote:
> 
>> The kernel still allocated the page caches on old node after modifying its
>> cpuset's mems when 'memory_spread_page' was set, or it didn't spread the page
>> cache evenly over all the nodes that faulting task is allowed to usr after
>> memory_spread_page was set. it is caused by the old mem_allowed and flags
>> of the task, the current kernel doesn't updates them unless some function
>> invokes cpuset_update_task_memory_state(), it is too late sometimes.We must
>> update the mem_allowed and the flags of the tasks in time.
>>
>> Slab has the same problem.
>>
>> The following patches fix this bug by updating tasks' mem_allowed and spread
>> flag after its cpuset's mems or spread flag is changed.
>>
>> patch 1: restructure the function cpuset_update_task_memory_state()
>> patch 2: update tasks' page/slab spread flags in time
>> patch 3: update tasks' mems_allowed in time
>>
>>
>> --
>> To unsubscribe, send a message with 'unsubscribe linux-mm' in
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>> see: http://www.linux-mm.org/ .
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>>
> 
> 
> 


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