mm: align larger anonymous mappings on THP boundaries
Align larger anonymous memory mappings on THP boundaries by going through thp_get_unmapped_area if THPs are enabled for the current process. With this patch, larger anonymous mappings are now THP aligned. When a malloc library allocates a 2MB or larger arena, that arena can now be mapped with THPs right from the start, which can result in better TLB hit rates and execution time. Link: https://lkml.kernel.org/r/20220809142457.4751229f@imladris.surriel.com Signed-off-by: Rik van Riel <riel@surriel.com> Reviewed-by: Yang Shi <shy828301@gmail.com> Cc: Matthew Wilcox <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -2232,6 +2232,9 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
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*/
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pgoff = 0;
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get_area = shmem_get_unmapped_area;
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} else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) {
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/* Ensures that larger anonymous mappings are THP aligned. */
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get_area = thp_get_unmapped_area;
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}
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addr = get_area(file, addr, len, pgoff, flags);
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