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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-15 00:34:10 +08:00

mm/lru: Add folio LRU functions

Handle arbitrary-order folios being added to the LRU.  By definition,
all pages being added to the LRU were already head or base pages, but
call page_folio() on them anyway to get the type right and avoid the
buried calls to compound_head().

Saves 783 bytes of kernel text; no functions grow.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Yu Zhao <yuzhao@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Howells <dhowells@redhat.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-02-25 09:47:41 -05:00
parent d389a4a811
commit 889a3747b3
3 changed files with 69 additions and 37 deletions

View File

@ -95,6 +95,7 @@ More Memory Management Functions
.. kernel-doc:: mm/mempolicy.c
.. kernel-doc:: include/linux/mm_types.h
:internal:
.. kernel-doc:: include/linux/mm_inline.h
.. kernel-doc:: include/linux/page-flags.h
.. kernel-doc:: include/linux/mm.h
:internal:

View File

@ -6,27 +6,33 @@
#include <linux/swap.h>
/**
* page_is_file_lru - should the page be on a file LRU or anon LRU?
* @page: the page to test
*
* Returns 1 if @page is a regular filesystem backed page cache page or a lazily
* freed anonymous page (e.g. via MADV_FREE). Returns 0 if @page is a normal
* anonymous page, a tmpfs page or otherwise ram or swap backed page. Used by
* functions that manipulate the LRU lists, to sort a page onto the right LRU
* list.
* folio_is_file_lru - Should the folio be on a file LRU or anon LRU?
* @folio: The folio to test.
*
* We would like to get this info without a page flag, but the state
* needs to survive until the page is last deleted from the LRU, which
* needs to survive until the folio is last deleted from the LRU, which
* could be as far down as __page_cache_release.
*
* Return: An integer (not a boolean!) used to sort a folio onto the
* right LRU list and to account folios correctly.
* 1 if @folio is a regular filesystem backed page cache folio
* or a lazily freed anonymous folio (e.g. via MADV_FREE).
* 0 if @folio is a normal anonymous folio, a tmpfs folio or otherwise
* ram or swap backed folio.
*/
static inline int folio_is_file_lru(struct folio *folio)
{
return !folio_test_swapbacked(folio);
}
static inline int page_is_file_lru(struct page *page)
{
return !PageSwapBacked(page);
return folio_is_file_lru(page_folio(page));
}
static __always_inline void update_lru_size(struct lruvec *lruvec,
enum lru_list lru, enum zone_type zid,
int nr_pages)
long nr_pages)
{
struct pglist_data *pgdat = lruvec_pgdat(lruvec);
@ -39,69 +45,94 @@ static __always_inline void update_lru_size(struct lruvec *lruvec,
}
/**
* __clear_page_lru_flags - clear page lru flags before releasing a page
* @page: the page that was on lru and now has a zero reference
* __folio_clear_lru_flags - Clear page lru flags before releasing a page.
* @folio: The folio that was on lru and now has a zero reference.
*/
static __always_inline void __clear_page_lru_flags(struct page *page)
static __always_inline void __folio_clear_lru_flags(struct folio *folio)
{
VM_BUG_ON_PAGE(!PageLRU(page), page);
VM_BUG_ON_FOLIO(!folio_test_lru(folio), folio);
__ClearPageLRU(page);
__folio_clear_lru(folio);
/* this shouldn't happen, so leave the flags to bad_page() */
if (PageActive(page) && PageUnevictable(page))
if (folio_test_active(folio) && folio_test_unevictable(folio))
return;
__ClearPageActive(page);
__ClearPageUnevictable(page);
__folio_clear_active(folio);
__folio_clear_unevictable(folio);
}
static __always_inline void __clear_page_lru_flags(struct page *page)
{
__folio_clear_lru_flags(page_folio(page));
}
/**
* page_lru - which LRU list should a page be on?
* @page: the page to test
* folio_lru_list - Which LRU list should a folio be on?
* @folio: The folio to test.
*
* Returns the LRU list a page should be on, as an index
* Return: The LRU list a folio should be on, as an index
* into the array of LRU lists.
*/
static __always_inline enum lru_list page_lru(struct page *page)
static __always_inline enum lru_list folio_lru_list(struct folio *folio)
{
enum lru_list lru;
VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page);
VM_BUG_ON_FOLIO(folio_test_active(folio) && folio_test_unevictable(folio), folio);
if (PageUnevictable(page))
if (folio_test_unevictable(folio))
return LRU_UNEVICTABLE;
lru = page_is_file_lru(page) ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON;
if (PageActive(page))
lru = folio_is_file_lru(folio) ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON;
if (folio_test_active(folio))
lru += LRU_ACTIVE;
return lru;
}
static __always_inline
void lruvec_add_folio(struct lruvec *lruvec, struct folio *folio)
{
enum lru_list lru = folio_lru_list(folio);
update_lru_size(lruvec, lru, folio_zonenum(folio),
folio_nr_pages(folio));
list_add(&folio->lru, &lruvec->lists[lru]);
}
static __always_inline void add_page_to_lru_list(struct page *page,
struct lruvec *lruvec)
{
enum lru_list lru = page_lru(page);
lruvec_add_folio(lruvec, page_folio(page));
}
update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page));
list_add(&page->lru, &lruvec->lists[lru]);
static __always_inline
void lruvec_add_folio_tail(struct lruvec *lruvec, struct folio *folio)
{
enum lru_list lru = folio_lru_list(folio);
update_lru_size(lruvec, lru, folio_zonenum(folio),
folio_nr_pages(folio));
list_add_tail(&folio->lru, &lruvec->lists[lru]);
}
static __always_inline void add_page_to_lru_list_tail(struct page *page,
struct lruvec *lruvec)
{
enum lru_list lru = page_lru(page);
lruvec_add_folio_tail(lruvec, page_folio(page));
}
update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page));
list_add_tail(&page->lru, &lruvec->lists[lru]);
static __always_inline
void lruvec_del_folio(struct lruvec *lruvec, struct folio *folio)
{
list_del(&folio->lru);
update_lru_size(lruvec, folio_lru_list(folio), folio_zonenum(folio),
-folio_nr_pages(folio));
}
static __always_inline void del_page_from_lru_list(struct page *page,
struct lruvec *lruvec)
{
list_del(&page->lru);
update_lru_size(lruvec, page_lru(page), page_zonenum(page),
-thp_nr_pages(page));
lruvec_del_folio(lruvec, page_folio(page));
}
#endif

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@ -41,7 +41,7 @@ TRACE_EVENT(mm_lru_insertion,
TP_fast_assign(
__entry->page = page;
__entry->pfn = page_to_pfn(page);
__entry->lru = page_lru(page);
__entry->lru = folio_lru_list(page_folio(page));
__entry->flags = trace_pagemap_flags(page);
),