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mm: align larger anonymous mappings on THP boundaries

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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
Link: https://lkml.kernel.org/r/20231214223423.1133074-1-yang@os.amperecomputing.com
Signed-off-by: Rik van Riel <riel@surriel.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Christopher Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Rik van Riel 2023-12-14 14:34:23 -08:00 committed by Andrew Morton
parent 1803d0c5ee
commit efa7df3e3b
1 changed files with 3 additions and 0 deletions
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mm/mmap.c
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@ -1829,6 +1829,9 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
*/ */
pgoff = 0; pgoff = 0;
get_area = shmem_get_unmapped_area; get_area = shmem_get_unmapped_area;
} else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) {
/* Ensures that larger anonymous mappings are THP aligned. */
get_area = thp_get_unmapped_area;
} }
addr = get_area(file, addr, len, pgoff, flags); addr = get_area(file, addr, len, pgoff, flags);