The patch titled
Subject: mm: convert free_unref_page_list() to use folios
has been added to the -mm mm-unstable branch. Its filename is
mm-convert-free_unref_page_list-to-use-folios.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-convert-free_unref_page_list-to-use-folios.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: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm: convert free_unref_page_list() to use folios
Date: Tue, 27 Feb 2024 17:42:36 +0000
Most of its callees are not yet ready to accept a folio, but we know all
of the pages passed in are actually folios because they're linked through
->lru.
Link: https://lkml.kernel.org/r/20240227174254.710559-3-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 38 ++++++++++++++++++++------------------
1 file changed, 20 insertions(+), 18 deletions(-)
--- a/mm/page_alloc.c~mm-convert-free_unref_page_list-to-use-folios
+++ a/mm/page_alloc.c
@@ -2520,17 +2520,17 @@ void free_unref_page(struct page *page,
void free_unref_page_list(struct list_head *list)
{
unsigned long __maybe_unused UP_flags;
- struct page *page, *next;
+ struct folio *folio, *next;
struct per_cpu_pages *pcp = NULL;
struct zone *locked_zone = NULL;
int batch_count = 0;
int migratetype;
/* Prepare pages for freeing */
- list_for_each_entry_safe(page, next, list, lru) {
- unsigned long pfn = page_to_pfn(page);
- if (!free_unref_page_prepare(page, pfn, 0)) {
- list_del(&page->lru);
+ list_for_each_entry_safe(folio, next, list, lru) {
+ unsigned long pfn = folio_pfn(folio);
+ if (!free_unref_page_prepare(&folio->page, pfn, 0)) {
+ list_del(&folio->lru);
continue;
}
@@ -2538,24 +2538,25 @@ void free_unref_page_list(struct list_he
* Free isolated pages directly to the allocator, see
* comment in free_unref_page.
*/
- migratetype = get_pcppage_migratetype(page);
+ migratetype = get_pcppage_migratetype(&folio->page);
if (unlikely(is_migrate_isolate(migratetype))) {
- list_del(&page->lru);
- free_one_page(page_zone(page), page, pfn, 0, migratetype, FPI_NONE);
+ list_del(&folio->lru);
+ free_one_page(folio_zone(folio), &folio->page, pfn,
+ 0, migratetype, FPI_NONE);
continue;
}
}
- list_for_each_entry_safe(page, next, list, lru) {
- struct zone *zone = page_zone(page);
+ list_for_each_entry_safe(folio, next, list, lru) {
+ struct zone *zone = folio_zone(folio);
- list_del(&page->lru);
- migratetype = get_pcppage_migratetype(page);
+ list_del(&folio->lru);
+ migratetype = get_pcppage_migratetype(&folio->page);
/*
* Either different zone requiring a different pcp lock or
* excessive lock hold times when freeing a large list of
- * pages.
+ * folios.
*/
if (zone != locked_zone || batch_count == SWAP_CLUSTER_MAX) {
if (pcp) {
@@ -2566,15 +2567,16 @@ void free_unref_page_list(struct list_he
batch_count = 0;
/*
- * trylock is necessary as pages may be getting freed
+ * trylock is necessary as folios may be getting freed
* from IRQ or SoftIRQ context after an IO completion.
*/
pcp_trylock_prepare(UP_flags);
pcp = pcp_spin_trylock(zone->per_cpu_pageset);
if (unlikely(!pcp)) {
pcp_trylock_finish(UP_flags);
- free_one_page(zone, page, page_to_pfn(page),
- 0, migratetype, FPI_NONE);
+ free_one_page(zone, &folio->page,
+ folio_pfn(folio), 0,
+ migratetype, FPI_NONE);
locked_zone = NULL;
continue;
}
@@ -2588,8 +2590,8 @@ void free_unref_page_list(struct list_he
if (unlikely(migratetype >= MIGRATE_PCPTYPES))
migratetype = MIGRATE_MOVABLE;
- trace_mm_page_free_batched(page);
- free_unref_page_commit(zone, pcp, page, migratetype, 0);
+ trace_mm_page_free_batched(&folio->page);
+ free_unref_page_commit(zone, pcp, &folio->page, migratetype, 0);
batch_count++;
}
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-support-order-1-folios-in-the-page-cache.patch
mm-make-folios_put-the-basis-of-release_pages.patch
mm-convert-free_unref_page_list-to-use-folios.patch
mm-add-free_unref_folios.patch
mm-use-folios_put-in-__folio_batch_release.patch
memcg-add-mem_cgroup_uncharge_folios.patch
mm-remove-use-of-folio-list-from-folios_put.patch
mm-use-free_unref_folios-in-put_pages_list.patch
mm-use-__page_cache_release-in-folios_put.patch
mm-handle-large-folios-in-free_unref_folios.patch
mm-allow-non-hugetlb-large-folios-to-be-batch-processed.patch
mm-free-folios-in-a-batch-in-shrink_folio_list.patch
mm-free-folios-directly-in-move_folios_to_lru.patch
memcg-remove-mem_cgroup_uncharge_list.patch
mm-remove-free_unref_page_list.patch
mm-remove-lru_to_page.patch
mm-convert-free_pages_and_swap_cache-to-use-folios_put.patch
mm-use-a-folio-in-__collapse_huge_page_copy_succeeded.patch
mm-convert-free_swap_cache-to-take-a-folio.patch
