The patch titled
Subject: mm-page_alloc-remove-prefetchw-on-freeing-page-to-buddy-system-v2
has been added to the -mm mm-unstable branch. Its filename is
mm-page_alloc-remove-prefetchw-on-freeing-page-to-buddy-system-v2.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_alloc-remove-prefetchw-on-freeing-page-to-buddy-system-v2.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: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: mm-page_alloc-remove-prefetchw-on-freeing-page-to-buddy-system-v2
Date: Thu, 4 Jul 2024 01:59:06 +0000
slightly adjust the loop based on David's comment
Link: https://lkml.kernel.org/r/20240704015906.18437-1-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Suggested-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
--- a/mm/page_alloc.c~mm-page_alloc-remove-prefetchw-on-freeing-page-to-buddy-system-v2
+++ a/mm/page_alloc.c
@@ -1224,7 +1224,7 @@ void __free_pages_core(struct page *page
{
unsigned int nr_pages = 1 << order;
struct page *p = page;
- unsigned int loop;
+ unsigned int loop = 0;
/*
* When initializing the memmap, __init_single_page() sets the refcount
@@ -1236,10 +1236,13 @@ void __free_pages_core(struct page *page
*/
if (IS_ENABLED(CONFIG_MEMORY_HOTPLUG) &&
unlikely(context == MEMINIT_HOTPLUG)) {
- for (loop = 0; loop < nr_pages; loop++, p++) {
+ for (;;) {
VM_WARN_ON_ONCE(PageReserved(p));
__ClearPageOffline(p);
set_page_count(p, 0);
+ if (++loop >= nr_pages)
+ break;
+ p++;
}
/*
@@ -1250,9 +1253,12 @@ void __free_pages_core(struct page *page
debug_pagealloc_map_pages(page, nr_pages);
adjust_managed_page_count(page, nr_pages);
} else {
- for (loop = 0; loop < nr_pages; loop++, p++) {
+ for (;;) {
__ClearPageReserved(p);
set_page_count(p, 0);
+ if (++loop >= nr_pages)
+ break;
+ p++;
}
/* memblock adjusts totalram_pages() manually. */
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
kernel-forkc-get-totalram_pages-from-memblock-to-calculate-max_threads.patch
kernel-forkc-put-set_max_threads-task_struct_whitelist-in-__init-section.patch
mm-page_alloc-remove-prefetchw-on-freeing-page-to-buddy-system.patch
mm-page_alloc-remove-prefetchw-on-freeing-page-to-buddy-system-v2.patch
