The patch titled
Subject: mm: page_idle: convert page idle to use a folio
has been added to the -mm mm-unstable branch. Its filename is
mm-page_idle-convert-page-idle-to-use-a-folio.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_idle-convert-page-idle-to-use-a-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: page_idle: convert page idle to use a folio
Date: Fri, 30 Dec 2022 15:08:43 +0800
Firstly, make page_idle_get_page() return a folio, also rename it to
page_idle_get_folio(), then, use it to convert page_idle_bitmap_read() and
page_idle_bitmap_write() functions.
Link: https://lkml.kernel.org/r/20221230070849.63358-3-wangkefeng.wang@xxxxxxxxxx
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Reviewed-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/page_idle.c~mm-page_idle-convert-page-idle-to-use-a-folio
+++ a/mm/page_idle.c
@@ -31,19 +31,22 @@
*
* This function tries to get a user memory page by pfn as described above.
*/
-static struct page *page_idle_get_page(unsigned long pfn)
+static struct folio *page_idle_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;
}
static bool page_idle_clear_pte_refs_one(struct folio *folio,
@@ -83,10 +86,8 @@ static bool page_idle_clear_pte_refs_one
return true;
}
-static void page_idle_clear_pte_refs(struct page *page)
+static void page_idle_clear_pte_refs(struct folio *folio)
{
- struct folio *folio = page_folio(page);
-
/*
* Since rwc.try_lock is unused, rwc is effectively immutable, so we
* can make it static to save some cycles and stack.
@@ -115,7 +116,7 @@ static ssize_t page_idle_bitmap_read(str
loff_t pos, size_t count)
{
u64 *out = (u64 *)buf;
- struct page *page;
+ struct folio *folio;
unsigned long pfn, end_pfn;
int bit;
@@ -134,19 +135,19 @@ static ssize_t page_idle_bitmap_read(str
bit = pfn % BITMAP_CHUNK_BITS;
if (!bit)
*out = 0ULL;
- page = page_idle_get_page(pfn);
- if (page) {
- if (page_is_idle(page)) {
+ folio = page_idle_get_folio(pfn);
+ if (folio) {
+ if (folio_test_idle(folio)) {
/*
* The page might have been referenced via a
* pte, in which case it is not idle. Clear
* refs and recheck.
*/
- page_idle_clear_pte_refs(page);
- if (page_is_idle(page))
+ page_idle_clear_pte_refs(folio);
+ if (folio_test_idle(folio))
*out |= 1ULL << bit;
}
- put_page(page);
+ folio_put(folio);
}
if (bit == BITMAP_CHUNK_BITS - 1)
out++;
@@ -160,7 +161,7 @@ static ssize_t page_idle_bitmap_write(st
loff_t pos, size_t count)
{
const u64 *in = (u64 *)buf;
- struct page *page;
+ struct folio *folio;
unsigned long pfn, end_pfn;
int bit;
@@ -178,11 +179,11 @@ static ssize_t page_idle_bitmap_write(st
for (; pfn < end_pfn; pfn++) {
bit = pfn % BITMAP_CHUNK_BITS;
if ((*in >> bit) & 1) {
- page = page_idle_get_page(pfn);
- if (page) {
- page_idle_clear_pte_refs(page);
- set_page_idle(page);
- put_page(page);
+ folio = page_idle_get_folio(pfn);
+ if (folio) {
+ page_idle_clear_pte_refs(folio);
+ folio_set_idle(folio);
+ folio_put(folio);
}
}
if (bit == BITMAP_CHUNK_BITS - 1)
_
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-huge_memory-convert-split_huge_pages_all-to-use-a-folio.patch
mm-page_idle-convert-page-idle-to-use-a-folio.patch
mm-damon-introduce-damon_get_folio.patch
mm-damon-convert-damon_ptep-pmdp_mkold-to-use-a-folio.patch
mm-damon-paddr-convert-damon_pa_-to-use-a-folio.patch
mm-damon-vaddr-convert-damon_young_pmd_entry-to-use-a-folio.patch
mm-damon-remove-unneeded-damon_get_page.patch
mm-damon-vaddr-convert-hugetlb-related-functions-to-use-a-folio.patch
