The patch titled
Subject: mm/damon: introduce damon_get_folio()
has been added to the -mm mm-unstable branch. Its filename is
mm-damon-introduce-damon_get_folio.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-introduce-damon_get_folio.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: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Subject: mm/damon: introduce damon_get_folio()
Date: Wed, 28 Dec 2022 19:34:08 +0800
Introduce damon_get_folio(), and the temporary wrapper function
damon_get_page(), which help us to convert damon related functions to use
folios, and it will be dropped once the conversion is completed.
Link: https://lkml.kernel.org/r/20221228113413.10329-3-wangkefeng.wang@xxxxxxxxxx
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: SeongJae Park <sj@xxxxxxxxxx>
Cc: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/damon/ops-common.c~mm-damon-introduce-damon_get_folio
+++ a/mm/damon/ops-common.c
@@ -16,21 +16,25 @@
* Get an online page for a pfn if it's in the LRU list. Otherwise, returns
* NULL.
*
- * The body of this function is stolen from the 'page_idle_get_page()'. We
+ * The body of this function is stolen from the 'page_idle_get_folio()'. We
* steal rather than reuse it because the code is quite simple.
*/
-struct page *damon_get_page(unsigned long pfn)
+struct folio *damon_get_folio(unsigned long pfn)
{
struct page *page = pfn_to_online_page(pfn);
+ struct folio *folio;
- if (!page || !PageLRU(page) || !get_page_unless_zero(page))
+ if (!page || PageTail(page))
return NULL;
- if (unlikely(!PageLRU(page))) {
- put_page(page);
- page = NULL;
+ folio = page_folio(page);
+ if (!folio_test_lru(folio) || !folio_try_get(folio))
+ return NULL;
+ if (unlikely(page_folio(page) != folio || !folio_test_lru(folio))) {
+ folio_put(folio);
+ folio = NULL;
}
- return page;
+ return folio;
}
void damon_ptep_mkold(pte_t *pte, struct mm_struct *mm, unsigned long addr)
--- a/mm/damon/ops-common.h~mm-damon-introduce-damon_get_folio
+++ a/mm/damon/ops-common.h
@@ -7,7 +7,14 @@
#include <linux/damon.h>
-struct page *damon_get_page(unsigned long pfn);
+struct folio *damon_get_folio(unsigned long pfn);
+static inline struct page *damon_get_page(unsigned long pfn)
+{
+ struct folio *folio = damon_get_folio(pfn);
+
+ /* when folio is NULL, return &(0->page) mean return NULL */
+ return &folio->page;
+}
void damon_ptep_mkold(pte_t *pte, struct mm_struct *mm, unsigned long addr);
void damon_pmdp_mkold(pmd_t *pmd, struct mm_struct *mm, unsigned long addr);
_
Patches currently in -mm which might be from wangkefeng.wang@xxxxxxxxxx are
mm-hwposion-support-recovery-from-ksm_might_need_to_copy.patch
mm-hwposion-support-recovery-from-ksm_might_need_to_copy-v3.patch
mm-huge_memory-convert-madvise_free_huge_pmd-to-use-a-folio.patch
mm-swap-convert-mark_page_lazyfree-to-folio_mark_lazyfree.patch
mm-page_idle-convert-page-idle-to-use-folios.patch
mm-damon-introduce-damon_get_folio.patch
mm-damon-convert-damon_ptep-pmdp_mkold-to-use-folios.patch
mm-damon-paddr-convert-damon_pa_-to-use-folios.patch
mm-damon-vaddr-convert-damon_young_pmd_entry-to-use-folio.patch
mm-damon-remove-unneed-damon_get_page.patch
mm-damon-vaddr-convert-hugetlb-related-function-to-use-folios.patch
