[merged mm-hotfixes-stable] mm-align-larger-anonymous-mappings-on-thp-boundaries.patch removed from -mm tree

[merged mm-hotfixes-stable] mm-align-larger-anonymous-mappings-on-thp-boundaries.patch removed from -mm tree

[Andrew Morton]

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@surriel.com>
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@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>
---

 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@surriel.com are