linux-kernel - Re: + per-cpuset-hugetlb-accounting-and-administration.patch added to -mm tree

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Date:	Thu, 3 May 2007 23:45:53 -0700
From:	Bill Irwin <bill.irwin@...cle.com>
To:	Paul Jackson <pj@....com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mm-commits@...r.kernel.org, kenchen@...gle.com, agl@...ibm.com,
	hermes@...son.dropbear.id.au, clameter@....com
Subject: Re: + per-cpuset-hugetlb-accounting-and-administration.patch added to -mm tree

On Thu, May 03, 2007 at 06:38:21PM -0700, Paul Jackson wrote:
> Adding Christoph Lameter <clameter@....com> to the cc list, as he knows
> more about hugetlb pages than I do.
> This patch strikes me as a bit odd.
> Granted, it's solving what could be a touchy problem with a fairly
> simple solution, which is usually a Good Thing(tm).
> However, the idea that different tasks would see different values for
> the following fields in /proc/meminfo:
> 	HugePages_Total:     0
> 	HugePages_Free:      0
> strikes me as odd, and risky.  I would have thought that usually, all
> tasks in the system should see the same values in the files in /proc
> (as opposed to the files in particular task subdirectories /proc/<pid>.)
> This patch strikes me as a bit of a hack, good for compatibility, but
> hiding a booby trap that will bite some user code in the long run.
> But I'm not enough of an expert to know what the right tradeoffs are
> in this matter.

The semantics of the global /proc/meminfo should not change; a separate
per-cpuset reporting mechanism should really be used.


-- wli
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