The quilt patch titled
Subject: mm: align larger anonymous mappings on THP boundaries
has been removed from the -mm tree. Its filename was
mm-align-larger-anonymous-mappings-on-thp-boundaries.patch
This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Rik van Riel <riel@xxxxxxxxxxx>
Subject: mm: align larger anonymous mappings on THP boundaries
Date: Thu, 14 Dec 2023 14:34:23 -0800
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
Link: https://lkml.kernel.org/r/20231214223423.1133074-1-yang@xxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Rik van Riel <riel@xxxxxxxxxxx>
Reviewed-by: Yang Shi <shy828301@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Christopher Lameter <cl@xxxxxxxxx>
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
@@ -1829,6 +1829,9 @@ 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
