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Subject[PATCH 3/3] mm: deprecate pagevec lru-add functions
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They mostly unused, the last user is fs/cachefiles/rdwr.c
This patch replaces __pagevec_lru_add() with smaller implementation.
It is exported, so we should keep it for a while.

Plus simplify and fix pathetic single-page page-vector operations in
nfs_symlink(), this was second pagevec_lru_add_file() user.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
---
fs/nfs/dir.c | 10 +++-------
include/linux/pagevec.h | 4 +++-
mm/swap.c | 27 +++++++--------------------
3 files changed, 13 insertions(+), 28 deletions(-)
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index fd9a872..c789aa4 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1850,7 +1850,6 @@ static int nfs_unlink(struct inode *dir, struct dentry *dentry)
*/
static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
- struct pagevec lru_pvec;
struct page *page;
char *kaddr;
struct iattr attr;
@@ -1890,15 +1889,12 @@ static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *sym
* No big deal if we can't add this page to the page cache here.
* READLINK will get the missing page from the server if needed.
*/
- pagevec_init(&lru_pvec, 0);
- if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0,
+ if (!add_to_page_cache_lru(page, dentry->d_inode->i_mapping, 0,
GFP_KERNEL)) {
- pagevec_add(&lru_pvec, page);
- pagevec_lru_add_file(&lru_pvec);
SetPageUptodate(page);
unlock_page(page);
- } else
- __free_page(page);
+ }
+ put_page(page);

return 0;
}
diff --git a/include/linux/pagevec.h b/include/linux/pagevec.h
index 2aa12b8..4df37fe 100644
--- a/include/linux/pagevec.h
+++ b/include/linux/pagevec.h
@@ -21,7 +21,6 @@ struct pagevec {
};

void __pagevec_release(struct pagevec *pvec);
-void __pagevec_lru_add(struct pagevec *pvec, enum lru_list lru);
unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
pgoff_t start, unsigned nr_pages);
unsigned pagevec_lookup_tag(struct pagevec *pvec,
@@ -64,6 +63,9 @@ static inline void pagevec_release(struct pagevec *pvec)
__pagevec_release(pvec);
}

+/* Use lru_cache_add_list() instead */
+void __deprecated __pagevec_lru_add(struct pagevec *pvec, enum lru_list lru);
+
static inline void __pagevec_lru_add_anon(struct pagevec *pvec)
{
__pagevec_lru_add(pvec, LRU_INACTIVE_ANON);
diff --git a/mm/swap.c b/mm/swap.c
index 2b8d376..8d228d8 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -772,33 +772,20 @@ void lru_add_page_tail(struct zone* zone,
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

-static void __pagevec_lru_add_fn(struct page *page, void *arg)
-{
- enum lru_list lru = (enum lru_list)arg;
- struct zone *zone = page_zone(page);
- int file = is_file_lru(lru);
- int active = is_active_lru(lru);
-
- VM_BUG_ON(PageActive(page));
- VM_BUG_ON(PageUnevictable(page));
- VM_BUG_ON(PageLRU(page));
-
- SetPageLRU(page);
- if (active)
- SetPageActive(page);
- update_page_reclaim_stat(zone, page, file, active);
- add_page_to_lru_list(zone, page, lru);
-}
-
/*
* Add the passed pages to the LRU, then drop the caller's refcount
* on them. Reinitialises the caller's pagevec.
*/
void __pagevec_lru_add(struct pagevec *pvec, enum lru_list lru)
{
- VM_BUG_ON(is_unevictable_lru(lru));
+ LIST_HEAD(pages);
+ int i;

- pagevec_lru_move_fn(pvec, __pagevec_lru_add_fn, (void *)lru);
+ VM_BUG_ON(is_unevictable_lru(lru));
+ for ( i = 0 ; i < pvec->nr ; i++ )
+ list_add_tail(&pvec->pages[i]->lru, &pages);
+ pagevec_reinit(pvec);
+ __lru_cache_add_list(&pages, lru);
}
EXPORT_SYMBOL(__pagevec_lru_add);



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