[merged mm-stable] tmpfs-dont-enable-large-folios-if-not-supported.patch removed from -mm tree

[merged mm-stable] tmpfs-dont-enable-large-folios-if-not-supported.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: tmpfs: don't enable large folios if not supported
has been removed from the -mm tree.  Its filename was
     tmpfs-dont-enable-large-folios-if-not-supported.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: tmpfs: don't enable large folios if not supported
Date: Thu, 17 Oct 2024 22:17:42 +0800

tmpfs can support large folios, but there are some configurable options
(mount options and runtime deny/force) to enable/disable large folio
allocation, so there is a performance issue when performing writes without
large folios.  The issue is similar to commit 4e527d5841e2 ("iomap: fault
in smaller chunks for non-large folio mappings").

Since 'deny' is for emergencies and 'force' is for testing, performance
issues should not be a problem in real production environments, so don't
call mapping_set_large_folios() in __shmem_get_inode() when large folio is
disabled with mount huge=never option (default policy).

Link: https://lkml.kernel.org/r/20241017141742.1169404-1-wangkefeng.wang@huawei.com
Fixes: 9aac777aaf94 ("filemap: Convert generic_perform_write() to support large folios")
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/shmem.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/mm/shmem.c~tmpfs-dont-enable-large-folios-if-not-supported
+++ a/mm/shmem.c
@@ -2842,7 +2842,10 @@ static struct inode *__shmem_get_inode(s
 	cache_no_acl(inode);
 	if (sbinfo->noswap)
 		mapping_set_unevictable(inode->i_mapping);
-	mapping_set_large_folios(inode->i_mapping);
+
+	/* Don't consider 'deny' for emergencies and 'force' for testing */
+	if (sbinfo->huge)
+		mapping_set_large_folios(inode->i_mapping);
 
 	switch (mode & S_IFMT) {
 	default:
_

Patches currently in -mm which might be from wangkefeng.wang@huawei.com are

mm-use-aligned-address-in-clear_gigantic_page.patch
mm-use-aligned-address-in-copy_user_gigantic_page.patch