linux-kernel - Re: [PATCH 1/2] mm: fix bugs of mpol_rebind

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Message-ID: <alpine.DEB.2.00.1004230141400.2190@chino.kir.corp.google.com>
Date:	Fri, 23 Apr 2010 01:45:17 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Miao Xie <miaox@...fujitsu.com>
cc:	Lee Schermerhorn <lee.schermerhorn@...com>,
	Nick Piggin <npiggin@...e.de>, Paul Menage <menage@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH 1/2] mm: fix bugs of mpol_rebind_nodemask()

On Fri, 23 Apr 2010, Miao Xie wrote:

> Suppose the current mempolicy nodes is 0-2, we can remap it from 0-2 to 2,
> then we can remap it from 2 to 1, but we can't remap it from 2 to 0-2.
> 
> that is to say it can't be remaped to a large set of allowed nodes, and the task
> just can use the small set of nodes for ever, even the large set of nodes is allowed,
> I think it is unreasonable.
> 

That's been the behavior for at least three years so changing it from 
under the applications isn't acceptable, see 
Documentation/vm/numa_memory_policy.txt regarding mempolicy rebinds and 
the two flags that are defined that can be used to adjust the behavior.

The pol->v.nodes = nodes_empty(tmp) ? *nodes : tmp fix is welcome, 
however, as a standalone patch.
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