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Message-Id: <20201208194653.19180-11-willy@infradead.org>
Date: Tue, 8 Dec 2020 19:46:52 +0000
From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
To: linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
linux-kernel@...r.kernel.org
Subject: [RFC PATCH 10/11] mm/filemap: Add folio_add_to_page_cache
Pages being added to the page cache should already be folios, so
turn add_to_page_cache_lru() into a wrapper. Saves hundreds of
bytes of text.
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
include/linux/pagemap.h | 13 +++++++--
mm/filemap.c | 62 ++++++++++++++++++++---------------------
2 files changed, 41 insertions(+), 34 deletions(-)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 060faeb8d701..3bc56b3aa384 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -778,9 +778,9 @@ static inline int fault_in_pages_readable(const char __user *uaddr, int size)
}
int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
- pgoff_t index, gfp_t gfp_mask);
-int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
- pgoff_t index, gfp_t gfp_mask);
+ pgoff_t index, gfp_t gfp);
+int folio_add_to_page_cache(struct folio *folio, struct address_space *mapping,
+ pgoff_t index, gfp_t gfp);
extern void delete_from_page_cache(struct page *page);
extern void __delete_from_page_cache(struct page *page, void *shadow);
int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask);
@@ -805,6 +805,13 @@ static inline int add_to_page_cache(struct page *page,
return error;
}
+static inline int add_to_page_cache_lru(struct page *page,
+ struct address_space *mapping, pgoff_t index, gfp_t gfp)
+{
+ return folio_add_to_page_cache((struct folio *)page, mapping,
+ index, gfp);
+}
+
/**
* struct readahead_control - Describes a readahead request.
*
diff --git a/mm/filemap.c b/mm/filemap.c
index 56ff6aa24265..297144524f58 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -828,25 +828,25 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
}
EXPORT_SYMBOL_GPL(replace_page_cache_page);
-static noinline int __add_to_page_cache_locked(struct page *page,
+static noinline int __add_to_page_cache_locked(struct folio *folio,
struct address_space *mapping,
- pgoff_t offset, gfp_t gfp,
+ pgoff_t index, gfp_t gfp,
void **shadowp)
{
- XA_STATE(xas, &mapping->i_pages, offset);
- int huge = PageHuge(page);
+ XA_STATE(xas, &mapping->i_pages, index);
+ int huge = PageHuge(&folio->page);
int error;
- VM_BUG_ON_PAGE(!PageLocked(page), page);
- VM_BUG_ON_PAGE(PageSwapBacked(page), page);
+ VM_BUG_ON_PAGE(!FolioLocked(folio), &folio->page);
+ VM_BUG_ON_PAGE(FolioSwapBacked(folio), &folio->page);
mapping_set_update(&xas, mapping);
- get_page(page);
- page->mapping = mapping;
- page->index = offset;
+ get_folio(folio);
+ folio->page.mapping = mapping;
+ folio->page.index = index;
- if (!huge && !page_is_secretmem(page)) {
- error = mem_cgroup_charge(page, current->mm, gfp);
+ if (!huge && !page_is_secretmem(&folio->page)) {
+ error = mem_cgroup_charge(&folio->page, current->mm, gfp);
if (error)
goto error;
}
@@ -857,7 +857,7 @@ static noinline int __add_to_page_cache_locked(struct page *page,
unsigned int order = xa_get_order(xas.xa, xas.xa_index);
void *entry, *old = NULL;
- if (order > thp_order(page))
+ if (order > folio_order(folio))
xas_split_alloc(&xas, xa_load(xas.xa, xas.xa_index),
order, gfp);
xas_lock_irq(&xas);
@@ -874,13 +874,13 @@ static noinline int __add_to_page_cache_locked(struct page *page,
*shadowp = old;
/* entry may have been split before we acquired lock */
order = xa_get_order(xas.xa, xas.xa_index);
- if (order > thp_order(page)) {
+ if (order > folio_order(folio)) {
xas_split(&xas, old, order);
xas_reset(&xas);
}
}
- xas_store(&xas, page);
+ xas_store(&xas, folio);
if (xas_error(&xas))
goto unlock;
@@ -890,7 +890,7 @@ static noinline int __add_to_page_cache_locked(struct page *page,
/* hugetlb pages do not participate in page cache accounting */
if (!huge)
- __inc_lruvec_page_state(page, NR_FILE_PAGES);
+ __inc_lruvec_page_state(&folio->page, NR_FILE_PAGES);
unlock:
xas_unlock_irq(&xas);
} while (xas_nomem(&xas, gfp));
@@ -900,12 +900,12 @@ static noinline int __add_to_page_cache_locked(struct page *page,
goto error;
}
- trace_mm_filemap_add_to_page_cache(page);
+ trace_mm_filemap_add_to_page_cache(&folio->page);
return 0;
error:
- page->mapping = NULL;
+ folio->page.mapping = NULL;
/* Leave page->index set: truncation relies upon it */
- put_page(page);
+ put_folio(folio);
return error;
}
ALLOW_ERROR_INJECTION(__add_to_page_cache_locked, ERRNO);
@@ -925,22 +925,22 @@ ALLOW_ERROR_INJECTION(__add_to_page_cache_locked, ERRNO);
int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
pgoff_t offset, gfp_t gfp_mask)
{
- return __add_to_page_cache_locked(page, mapping, offset,
+ return __add_to_page_cache_locked(page_folio(page), mapping, offset,
gfp_mask, NULL);
}
EXPORT_SYMBOL(add_to_page_cache_locked);
-int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
- pgoff_t offset, gfp_t gfp_mask)
+int folio_add_to_page_cache(struct folio *folio, struct address_space *mapping,
+ pgoff_t index, gfp_t gfp_mask)
{
void *shadow = NULL;
int ret;
- __SetPageLocked(page);
- ret = __add_to_page_cache_locked(page, mapping, offset,
+ __SetFolioLocked(folio);
+ ret = __add_to_page_cache_locked(folio, mapping, index,
gfp_mask, &shadow);
if (unlikely(ret))
- __ClearPageLocked(page);
+ __ClearFolioLocked(folio);
else {
/*
* The page might have been evicted from cache only
@@ -950,14 +950,14 @@ int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
* data from the working set, only to cache data that will
* get overwritten with something else, is a waste of memory.
*/
- WARN_ON_ONCE(PageActive(page));
+ WARN_ON_ONCE(FolioActive(folio));
if (!(gfp_mask & __GFP_WRITE) && shadow)
- workingset_refault(page, shadow);
- lru_cache_add(page);
+ workingset_refault(&folio->page, shadow);
+ lru_cache_add(&folio->page);
}
return ret;
}
-EXPORT_SYMBOL_GPL(add_to_page_cache_lru);
+EXPORT_SYMBOL_GPL(folio_add_to_page_cache);
#ifdef CONFIG_NUMA
struct page *__page_cache_alloc(gfp_t gfp)
@@ -1817,7 +1817,7 @@ struct page *pagecache_get_page(struct address_space *mapping, pgoff_t index,
if (fgp_flags & FGP_ACCESSED)
__SetFolioReferenced(folio);
- err = add_to_page_cache_lru(page, mapping, index, gfp_mask);
+ err = folio_add_to_page_cache(folio, mapping, index, gfp_mask);
if (unlikely(err)) {
put_folio(folio);
page = NULL;
@@ -1826,8 +1826,8 @@ struct page *pagecache_get_page(struct address_space *mapping, pgoff_t index,
}
/*
- * add_to_page_cache_lru locks the page, and for mmap we expect
- * an unlocked page.
+ * folio_add_to_page_cache locks the page, and for mmap we
+ * expect an unlocked page.
*/
if (page && (fgp_flags & FGP_FOR_MMAP))
unlock_folio(folio);
--
2.29.2
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