linux-kernel - Re: [RFC 2/3] hugetlbfs: coordinate global and subpool reserve accounting

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Message-Id: <20150302151023.e40dd1c6a9bf3d29cb6b657c@linux-foundation.org>
Date:	Mon, 2 Mar 2015 15:10:23 -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 2/3] hugetlbfs: coordinate global and subpool reserve
 accounting

On Fri, 27 Feb 2015 14:58:11 -0800 Mike Kravetz <mike.kravetz@...cle.com> wrote:

> If the pages for a subpool are reserved, then the reservations have
> already been accounted for in the global pool.  Therefore, when
> requesting a new reservation (such as for a mapping) for the subpool
> do not count again in global pool.  However, when actually allocating
> a page for the subpool decrement global reserve count to correspond to
> with decrement in global free pages.

The last sentence made my brain hurt.
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