linux-kernel - Re: [patch 2/2] cpusets: add interleave_over

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Message-ID: <alpine.DEB.0.9999.0710271212450.19199@chino.kir.corp.google.com>
Date:	Sat, 27 Oct 2007 12:16:12 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
cc:	Christoph Lameter <clameter@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>, Paul Jackson <pj@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] cpusets: add interleave_over_allowed option

On Fri, 26 Oct 2007, David Rientjes wrote:

> Hacking and requiring an updated version of libnuma to allow empty 
> nodemasks to be passed is a poor solution; if mempolicy's are supposed to 
> be independent from cpusets, then what semantics does an empty nodemask 
> actually imply when using MPOL_INTERLEAVE?  To me, it means the entire 
> set_mempolicy() should be a no-op, and that's exactly how mainline 
> currently treats it _as_well_ as libnuma.  So justifying this change in 
> the man page is respectible, but passing an empty nodemask just doesn't 
> make sense.
> 

Another reason that passing an empty nodemask to set_mempolicy() doesn't 
make sense is that libnuma uses numa_set_interleave_mask(&numa_no_nodes)
to disable interleaving completely.

		David
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