Messages in this thread | | | Subject | Re: [PATCH] hugetlb: powerpc: Actively close unused htlb regions on vma close | From | Adam Litke <> | Date | Fri, 02 Jun 2006 11:49:28 -0500 |
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On Fri, 2006-06-02 at 17:43 +0100, Hugh Dickins wrote: > On Fri, 2 Jun 2006, Adam Litke wrote: > > > > On powerpc, each segment can contain pages of only one size. When a > > hugetlb mapping is requested, a segment is located and marked for use > > with huge pages. This is a uni-directional operation -- hugetlb > > segments are never marked for use again with normal pages. For long > > running processes which make use of a combination of normal and hugetlb > > mappings, this behavior can unduly constrain the virtual address space. > > > > The following patch introduces a architecture-specific vm_ops.close() > > hook. For all architectures besides powerpc, this is a no-op. On > > powerpc, the low and high segments are scanned to locate empty hugetlb > > segments which can be made available for normal mappings. Comments? > > Wouldn't hugetlb_free_pgd_range be a better place to do that kind of > thing, all within arch/powerpc, no need for arch_hugetlb_close_vma etc?
Hmm. Interesting idea. I'll take a look.
-- Adam Litke - (agl at us.ibm.com) IBM Linux Technology Center
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