linux-kernel - Re: [patch 3/4] mempolicy: add MPOL_F_STATIC

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Message-ID: <alpine.DEB.1.00.0802141739050.16945@chino.kir.corp.google.com>
Date:	Thu, 14 Feb 2008 17:44:11 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Paul Jackson <pj@....com>
cc:	akpm@...ux-foundation.org, clameter@....com,
	Lee.Schermerhorn@...com, ak@...e.de, linux-kernel@...r.kernel.org
Subject: Re: [patch 3/4] mempolicy: add MPOL_F_STATIC_NODES flag

On Thu, 14 Feb 2008, David Rientjes wrote:

> We'll need to decide whether mpol_equal() is determining the equality of 
> the currently effected mempolicy (whereas policy->user_nodemask is 
> irrelevant) or the whole intended mempolicy overall.
> 

I've done the latter in the latest patchset.

Since mpol_equal() is only used for determining whether nearby vmas can be 
merged, it is only logical to merge them if they share the mempolicy 
intent of the user if MPOL_F_STATIC_NODES or any flag that makes sense of 
policy->user_nodemask is used.

> > Could we have mpol_to_str() mark policies which are
> > MPOL_F_RELATIVE_NODES or MPOL_F_STATIC_NODES?  Perhaps
> > by adding a suffix of "|relative" or "|static" or some
> > such.
> > 
> 
> I'd like to keep it in the same format as the tmpfs mount option which is 
> '=relative' and '=static'.
> 

In preparation for mode flags in addition to MPOL_F_STATIC_NODES to be 
added (like MPOL_F_RELATIVE_NODES or whatever Paul decides to call it 
based on the latest feedback, I've prepared mpol_to_str() to have this 
format

	interleave=static|relative=1-3

as viewable from /proc/pid/numa_maps.  This is also how tmpfs mount 
options will be specified.

 [ Of course the above example can't happen since MPOL_F_STATIC_NODES and
   MPOL_F_RELATIVE_NODES are disjoint, but it's sufficient for the
   example. ]
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