Messages in this thread | | | Date | Sun, 12 Feb 2012 12:58:34 +0100 | From | Andrea Righi <> | Subject | Re: [RFC] [PATCH v5 0/3] fadvise: support POSIX_FADV_NOREUSE |
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On Sun, Feb 12, 2012 at 03:16:07PM +0800, Hillf Danton wrote: > Hello Andrea > > On Sun, Feb 12, 2012 at 8:21 AM, Andrea Righi <andrea@betterlinux.com> wrote: > [...] > > - Some of the routines to implement the generic interval tree has been taken > > from the x86 PAT code, that uses interval trees to keep track of PAT ranges > > (in the future it would be interesting to convert also the x86 PAT code to > > use the generic interval tree implementation). > > > Perhaps the tree implemented in this work could also be used in tracking > regions in mm/hugetlb.c. > > Thanks > Hillf
Thanks, Hillf.
Yes, I quickly looked at the hugtlb code, it seems another potential user of the interval tree. Now all the hugetlb regions are stored in a list, the interval tree is a more efficient structure for lookups - O(log(n)), so there are probably advantages in presence of many different disjoint intervals.
mmh... at the moment there's not a way to map region_count() with the current kinterval API, but we can easily extend it to provide also this feature (count the overlap size of two intervals).
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