The patch titled
Subject: mm: align larger anonymous mappings on THP boundaries
has been added to the -mm mm-unstable branch. Its filename is
mm-align-larger-anonymous-mappings-on-thp-boundaries.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-align-larger-anonymous-mappings-on-thp-boundaries.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Rik van Riel <riel@xxxxxxxxxxx>
Subject: mm: align larger anonymous mappings on THP boundaries
Date: Tue, 9 Aug 2022 14:24:57 -0400
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@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Rik van Riel <riel@xxxxxxxxxxx>
Reviewed-by: Yang Shi <shy828301@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 3 +++
1 file changed, 3 insertions(+)
--- a/mm/mmap.c~mm-align-larger-anonymous-mappings-on-thp-boundaries
+++ a/mm/mmap.c
@@ -2229,6 +2229,9 @@ get_unmapped_area(struct file *file, uns
*/
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);
_
Patches currently in -mm which might be from riel@xxxxxxxxxxx are
mm-align-larger-anonymous-mappings-on-thp-boundaries.patch
