On Mon, 10 Nov 2008, Mel Gorman wrote: > There has been some disagreement on what the exact purpose of get_huge_pages() > is. It was felt that the interface name implied that it dealt strictly with > hugepages. This was reinforced by the fact in 2.0 that the length parameter > had to be hugepage-aligned and that in 2.1-preX allocations were allowed > to fall back to base pages. This led to resistance when the scope of the > function was expanded further to include cache coloring. > > Rather than fighting endlessly, this patch series starts by enforcing that > get_huge_pages() is a low-level interface dealing exclusively with huge > pages. It no longer allows fallback and instead GHP_ flags in the future > will determine what size of hugepages should be used - e.g. GHP_LARGEST. > > The patch then adds a new API called get_hugepage_region() that is intended > to be vaguely malloc-like for the allocation of regions of memory that are > backed by hugepages where possible. It is not responsible for doing packing > like a true malloc-like interface would but it allows an unaligned length > and fallback to base pages. The last patch adds support for coloring buffers > allocated by get_hugepage_region(). > > See http://www.csn.ul.ie/~mel/compare-gethugepage-gethugeregion.ps > > It compares the two APIs when used once to allocate three buffers and called > once for each of the three buffers. Note that calling get_huge_page() > three times blows for performance as the three arrays use the same cache > lines at the same offsets. get_hugepage_region() does not suffer the same > problem as much as an effort is made to color the buffer. > > Changelog since V1 > o Correct typo in man pages (Jon) > o Cache color shuffle (Adam)
Applied, thanks. Eric
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