Re: [RFC][PATCH 1/2] Add shared and reserve control to hugetlb_file_setup

[Mel Gorman <mel@csn.ul.ie>]

On (02/05/08 09:16), Dave Hansen didst pronounce:
> On Thu, 2008-05-01 at 18:51 -0700, Eric B Munson wrote:
> > In order to back stacks with huge pages, we will want to make hugetlbfs
> > files to back them; these will be used to back private mappings.
> > Currently hugetlb_file_setup creates files to back shared memory segments.
> > Modify this to create both private and shared files,
> 
> Hugetlbfs can currently have private mappings, right?  Why not just use
> the existing ones instead of creating a new variety with
> hugetlb_file_setup()?
> 

hugetlb_file_setup() uses an internal mount to create files just for
SHM. However, it does the work necessary for MAP_SHARED mappings,
particularly reserve pages. The account is currently all fouled up to
deal with a private mapping that has reserves. Teaching
hugetlb_file_setup() to deal with private and shared mappings does
appear the most straight-forward route.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab

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