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

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Message-Id: <20070503183821.b75e8f57.pj@sgi.com>
Date:	Thu, 3 May 2007 18:38:21 -0700
From:	Paul Jackson <pj@....com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, mm-commits@...r.kernel.org,
	kenchen@...gle.com, agl@...ibm.com, hermes@...son.dropbear.id.au,
	wli@...omorphy.com, clameter@....com
Subject: Re: + per-cpuset-hugetlb-accounting-and-administration.patch added
 to -mm tree

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.

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