The patch titled
Subject: zsmalloc: use copy_page for full page copy
has been added to the -mm mm-unstable branch. Its filename is
zsmalloc-use-copy_page-for-full-page-copy.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zsmalloc-use-copy_page-for-full-page-copy.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: Mark-PK Tsai <mark-pk.tsai@xxxxxxxxxxxx>
Subject: zsmalloc: use copy_page for full page copy
Date: Fri, 6 Oct 2023 14:02:40 +0800
Some architectures have implemented optimized copy_page for full page
copying, such as arm.
On my arm platform, use the copy_page helper for single page copying is
about 10 percent faster than memcpy.
Link: https://lkml.kernel.org/r/20231006060245.7411-1-mark-pk.tsai@xxxxxxxxxxxx
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@xxxxxxxxxxxx>
Reviewed-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: YJ Chiang <yj.chiang@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/zsmalloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/zsmalloc.c~zsmalloc-use-copy_page-for-full-page-copy
+++ a/mm/zsmalloc.c
@@ -1839,7 +1839,7 @@ static int zs_page_migrate(struct page *
* Here, any user cannot access all objects in the zspage so let's move.
*/
d_addr = kmap_atomic(newpage);
- memcpy(d_addr, s_addr, PAGE_SIZE);
+ copy_page(d_addr, s_addr);
kunmap_atomic(d_addr);
for (addr = s_addr + offset; addr < s_addr + PAGE_SIZE;
_
Patches currently in -mm which might be from mark-pk.tsai@xxxxxxxxxxxx are
zsmalloc-use-copy_page-for-full-page-copy.patch
