Re: [RFD hugetlbfs] strict accounting and wasteful reservations

[Adam Litke <agl@us.ibm.com>]

On Thu, 2006-04-13 at 21:01 +0100, 'David Gibson' wrote:
> > We are thinking about switching the implementation of the ELF segment
> > remapping code to store all of the remapped segments in one hugetlbfs
> > file.  That way we have one hugetlb file per executable.  This makes
> > managing the segments much easier, especially when doing things like
> > global sharing.  When doing this, we'd like the file offset to
> > correspond to the virtual address of the mapped segment.  So I admit
> > that altering the kernel behavior helps libhugetlbfs, but I think my
> > second justification above is even more important.  I like removing
> > anomalies from hugetlbfs whenever possible.
> 
> Hrm... I'm not entirely convinced attempting to directly map vaddr to
> file offset is a good idea.  But give it a shot, I guess.

It works, but just wastes a ton of huge pages in the process.

-- 
Adam Litke - (agl at us.ibm.com)
IBM Linux Technology Center

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