linux-kernel - Re: [RFC 0/3] hugetlbfs: optionally reserve all fs pages at mount time

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Message-Id: <20150302151009.2ae58f4430f9f34b81533821@linux-foundation.org>
Date:	Mon, 2 Mar 2015 15:10:09 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mike Kravetz <mike.kravetz@...cle.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Nadia Yvette Chambers <nyc@...omorphy.com>,
	Davidlohr Bueso <davidlohr@...com>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [RFC 0/3] hugetlbfs: optionally reserve all fs pages at mount
 time

On Fri, 27 Feb 2015 14:58:08 -0800 Mike Kravetz <mike.kravetz@...cle.com> wrote:

> hugetlbfs allocates huge pages from the global pool as needed.  Even if
> the global pool contains a sufficient number pages for the filesystem
> size at mount time, those global pages could be grabbed for some other
> use.  As a result, filesystem huge page allocations may fail due to lack
> of pages.

Well OK, but why is this a sufficiently serious problem to justify
kernel changes?  Please provide enough info for others to be able
to understand the value of the change.
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