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

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Date:	Mon, 29 Oct 2007 13:02:17 -0700
From:	Paul Jackson <pj@....com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	rientjes@...gle.com, clameter@....com, akpm@...ux-foundation.org,
	ak@...e.de, linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] cpusets: add interleave_over_allowed option

Lee wrote:
> In libnuma in numactl-1.0.2 that I recently grabbed off Andi's site,
> numa_available() indeed issues this call.  But, I don't see any internal
> calls to numa_available() [comments says all other calls undefined when
> numa_available() returns an error] nor any other calls to
> get_mempolicy() with all null/0 args.  So, you'd be depending on the
> application to call numa_available().

Aha - good point.  It happened to be the numactl command line utility
that I tested with that issued the get_mempolicy(0,0,0,0,0) call.

Yup - this proposed hack, to have the kernel revert to the original
memory policy nodemask numbering if it sees such a getmempolicy call
is now officially dead meat.

Thanks.

> However, you could define an
> additional MPOL_F_* flag to get_mempolicy() that is issued in library
> init code to enable new behavior--again, based on some indication that
> new behavior is desired or not.

Yes - I am intending to define such MPOL_F_* flags, to set and get
which behavior applies to the current task.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.925.600.0401
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