linux-kernel - Re: [PATCH V2 4/4] hugetlbfs: document min

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Message-ID: <550C49B0.6070600@oracle.com>
Date:	Fri, 20 Mar 2015 09:24:16 -0700
From:	Mike Kravetz <mike.kravetz@...cle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Davidlohr Bueso <dave@...olabs.net>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH V2 4/4] hugetlbfs: document min_size mount option

On 03/18/2015 07:23 PM, Andrew Morton wrote:
> On Wed, 18 Mar 2015 18:51:22 -0700 Mike Kravetz <mike.kravetz@...cle.com> wrote:
>
>>> Nowhere here is the reader told the units of "size".  We should at
>>> least describe that, and maybe even rename the thing to min_bytes.
>>>
>>
>> Ok, I will add that the size is in unit of bytes.  My choice of
>> 'min_size' as a name for the new mount option was influenced by
>> the existing 'size' mount option.  I'm open to any suggestions
>> for the name of this new mount option.
>
> Yes, due to the preexisting "size" I think we're stuck with "min_size".
> We could use min_size_bytes I guess, but the operator needs to go look
> up the units of "size" anyway.
>

Well, the existing size option can also be specified as a percentage of
the huge page pool size.  This is in the current code.  There is a
mount option 'pagesize=' that allows one to select which huge page
(size) pool should be used. If none is specified the default huge page
pool is used.  There is no documentation for this pagesize option or
using size to specify a percentage of the huge page pool size.

I'll add this to the hugetlbpage.txt documentation.
-- 
Mike Kravetz
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