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

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Message-ID: <54F73F1C.4050601@oracle.com>
Date:	Wed, 04 Mar 2015 09:21:32 -0800
From:	Mike Kravetz <mike.kravetz@...cle.com>
To:	David Rientjes <rientjes@...gle.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

On 03/03/2015 09:49 PM, David Rientjes wrote:
> On Tue, 3 Mar 2015, Mike Kravetz wrote:
>> Add a new hugetlbfs mount option 'reserved' to specify that the number
>> of pages associated with the size of the filesystem will be reserved.  If
>> there are insufficient pages, the mount will fail.  The reservation is
>> maintained for the duration of the filesystem so that as pages are
>> allocated and free'ed a sufficient number of pages remains reserved.
>>
>
> This functionality is somewhat limited because it's not possible to
> reserve a subset of the size for a single mount point, it's either all or
> nothing.  It shouldn't be too difficult to just add a reserved=<value>
> option where <value> is <= size.  If it's done that way, you should be
> able to omit size= entirely for unlimited hugepages but always ensure that
> a low watermark of hugepages are reserved for the database.

Thanks, I like that suggestion.  You are correct in that it should not
be too difficult to pass in a size for reserved.  I'll work on the
modification.

-- 
Mike Kravetz
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