From: Mike Kravetz <mike.kravetz@oracle.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Nadia Yvette Chambers <nyc@holomorphy.com>,
Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: Re: [RFC 2/3] hugetlbfs: coordinate global and subpool reserve accounting
Date: Mon, 02 Mar 2015 17:30:25 -0800 [thread overview]
Message-ID: <54F50EB1.5090102@oracle.com> (raw)
In-Reply-To: <20150302151023.e40dd1c6a9bf3d29cb6b657c@linux-foundation.org>
On 03/02/2015 03:10 PM, Andrew Morton wrote:
> On Fri, 27 Feb 2015 14:58:11 -0800 Mike Kravetz <mike.kravetz@oracle.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.
>
Sorry. I was trying to point out that the global free and reserve
accounting is still the same when doing a page allocation, even
though the entire size of the subpool was reserved. For example,
when allocating a page the global free and reserve counts are both
decremented.
--
Mike Kravetz
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next prev parent reply other threads:[~2015-03-03 1:31 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-27 22:58 [RFC 0/3] hugetlbfs: optionally reserve all fs pages at mount time Mike Kravetz
2015-02-27 22:58 ` [RFC 1/3] hugetlbfs: add reserved mount fields to subpool structure Mike Kravetz
2015-02-27 22:58 ` Mike Kravetz
2015-03-02 23:10 ` Andrew Morton
2015-03-03 1:20 ` Mike Kravetz
2015-02-27 22:58 ` [RFC 2/3] hugetlbfs: coordinate global and subpool reserve accounting Mike Kravetz
2015-03-02 23:10 ` Andrew Morton
2015-03-03 1:30 ` Mike Kravetz [this message]
2015-02-27 22:58 ` Mike Kravetz
2015-02-27 22:58 ` [RFC 3/3] hugetlbfs: accept subpool reserved option and setup accordingly Mike Kravetz
2015-03-02 23:10 ` Andrew Morton
2015-03-03 1:36 ` Mike Kravetz
2015-03-02 23:10 ` [RFC 0/3] hugetlbfs: optionally reserve all fs pages at mount time Andrew Morton
2015-03-03 1:18 ` Mike Kravetz
2015-03-06 15:10 ` Michal Hocko
2015-03-06 18:58 ` Mike Kravetz
2015-03-06 21:14 ` David Rientjes
2015-03-06 21:32 ` Mike Kravetz
-- strict thread matches above, loose matches on Subject: below --
2015-02-28 3:25 [RFC 2/3] hugetlbfs: coordinate global and subpool reserve accounting Hillf Danton
2015-02-28 17:25 ` Mike Kravetz
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