linux-kernel - Re: [PATCH 0/4] hugetlbfs: optionally reserve all fs pages at mount time

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Message-ID: <87lhj9ai5u.fsf@tassilo.jf.intel.com>
Date:	Fri, 06 Mar 2015 14:13:33 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	Mike Kravetz <mike.kravetz@...cle.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 0/4] hugetlbfs: optionally reserve all fs pages at mount time

Mike Kravetz <mike.kravetz@...cle.com> writes:

> 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.


What's the difference of this new option to simply doing

mount -t hugetlbfs none /huge
echo XXX > /proc/sys/vm/nr_hugepages

?

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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