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

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Message-ID: <alpine.DEB.1.10.0904071703340.12192@qirst.com>
Date:	Tue, 7 Apr 2009 17:04:17 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Miao Xie <miaox@...fujitsu.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

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.

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
>
>
> --
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