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authorRik van Riel <riel@surriel.com>2023-12-14 23:34:23 +0100
committerAndrew Morton <akpm@linux-foundation.org>2023-12-29 20:06:47 +0100
commitefa7df3e3bb5da8e6abbe37727417f32a37fba47 (patch)
treef3a86329a295dc5d80b9e702d110719424651644
parentmailmap: add an old address for Naoya Horiguchi (diff)
downloadlinux-efa7df3e3bb5da8e6abbe37727417f32a37fba47.tar.xz
linux-efa7df3e3bb5da8e6abbe37727417f32a37fba47.zip
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 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>
-rw-r--r--mm/mmap.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 1971bfffcc03..aa82eec17489 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1829,6 +1829,9 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
*/
pgoff = 0;
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);