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mm/page_idle: Convert page_idle_clear_pte_refs() to use a folio 

The PG_idle and PG_young bits are ignored if they're set on tail
pages, so ensure we're passing a folio around.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-01-29 15:53:59 -05:00
parent 2aff7a4755
commit 4aed23a2f8
1 changed files with 12 additions and 9 deletions
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21
mm/page_idle.c
View File

@ -13,6 +13,8 @@
#include <linux/page_ext.h>
#include <linux/page_idle.h>
#include "internal.h"
#define BITMAP_CHUNK_SIZE sizeof(u64)
#define BITMAP_CHUNK_BITS (BITMAP_CHUNK_SIZE * BITS_PER_BYTE)
@ -48,7 +50,8 @@ static bool page_idle_clear_pte_refs_one(struct page *page,
struct vm_area_struct *vma,
unsigned long addr, void *arg)
{
DEFINE_PAGE_VMA_WALK(pvmw, page, vma, addr, 0);
struct folio *folio = page_folio(page);
DEFINE_FOLIO_VMA_WALK(pvmw, folio, vma, addr, 0);
bool referenced = false;
while (page_vma_mapped_walk(&pvmw)) {
@ -70,19 +73,20 @@ static bool page_idle_clear_pte_refs_one(struct page *page,
}
if (referenced) {
clear_page_idle(page);
folio_clear_idle(folio);
/*
* We cleared the referenced bit in a mapping to this page. To
* avoid interference with page reclaim, mark it young so that
* page_referenced() will return > 0.
*/
set_page_young(page);
folio_set_young(folio);
}
return true;
}
static void page_idle_clear_pte_refs(struct page *page)
{
struct folio *folio = page_folio(page);
/*
* Since rwc.arg is unused, rwc is effectively immutable, so we
* can make it static const to save some cycles and stack.
@ -93,18 +97,17 @@ static void page_idle_clear_pte_refs(struct page *page)
};
bool need_lock;
if (!page_mapped(page) ||
!page_rmapping(page))
if (!folio_mapped(folio) || !folio_raw_mapping(folio))
return;
need_lock = !PageAnon(page) || PageKsm(page);
if (need_lock && !trylock_page(page))
need_lock = !folio_test_anon(folio) || folio_test_ksm(folio);
if (need_lock && !folio_trylock(folio))
return;
rmap_walk(page, (struct rmap_walk_control *)&rwc);
rmap_walk(&folio->page, (struct rmap_walk_control *)&rwc);
if (need_lock)
unlock_page(page);
folio_unlock(folio);
}
static ssize_t page_idle_bitmap_read(struct file *file, struct kobject *kobj,