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From: Mike Kravetz <mike.kravetz@oracle.com>
To: David Rientjes <rientjes@google.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Davidlohr Bueso <dave@stgolabs.net>,
	Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: Re: [PATCH 0/4] hugetlbfs: optionally reserve all fs pages at mount time
Date: Wed, 04 Mar 2015 09:21:32 -0800	[thread overview]
Message-ID: <54F73F1C.4050601@oracle.com> (raw)
In-Reply-To: <alpine.DEB.2.10.1503032145110.12253@chino.kir.corp.google.com>

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

  reply	other threads:[~2015-03-04 17:22 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-04  1:21 Mike Kravetz
2015-03-04  1:21 ` [PATCH 1/4] hugetlbfs: add reserved mount fields to subpool structure Mike Kravetz
2015-03-04  1:21 ` [PATCH 2/4] hugetlbfs: coordinate global and subpool reserve accounting Mike Kravetz
2015-03-04  1:21 ` [PATCH 3/4] hugetlbfs: accept subpool reserved option and setup accordingly Mike Kravetz
2015-03-04  1:21 ` [PATCH 4/4] hugetlbfs: document reserved mount option Mike Kravetz
2015-03-04  5:49 ` [PATCH 0/4] hugetlbfs: optionally reserve all fs pages at mount time David Rientjes
2015-03-04 17:21   ` Mike Kravetz [this message]
2015-03-06 22:13 ` Andi Kleen
2015-03-06 22:30   ` Mike Kravetz

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