On (08/09/08 14:05), Adam Litke didst pronounce: > On Mon, 2008-09-08 at 17:33 +0100, Mel Gorman wrote: > > By default, libhugetlbfs will fall back to using base pages when huge pages > > are not available. In some situations such as benchmarking this may not be > > desirable as the user would be using base pages when they believed huge > > pages were in use. This patch enables the user to specify that hugepages > > must be used by setting the HUGETLB_STRICT environment variable. > > Since there is no user at present that is asking for this feature, I > think we should put it on hold.
Indeed, I am the user that needed this actually as some results that made "no sense" turned out to be because hugepages were not being used at all. It was obvious when I went through debugging output but not at all obvious otherwise. I can maintain this patch external to the tree for my own purposes and revisit this later. > We may want to employ a more > sophisticated fallback mechanism in the future (one that can take > advantage of multiple huge page sizes). If we end up going that route, > we may want a different environment variable (such as > HUGETLB_FALLBACK_MODE) which could be set to allow fallback to other > page sizes, allow no fallback, or allow fallback without trying other > sizes. > > Regardless of how people feel about my cross-page-size fallback ideas, I > don't feel that there is an immediate, pressing need for this feature > right now. > Grand -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Libhugetlbfs-devel mailing list Libhugetlbfs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libhugetlbfs-devel
