[PATCH v5 2/3] mm: filemap: introduce mark_page_usedonce
From: Andrea Righi <hidden>
Date: 2012-02-12 00:21:37
Also in:
linux-fsdevel, lkml
Subsystem:
memory management, memory management - mglru (multi-gen lru), memory management - swap, the rest · Maintainers:
Andrew Morton, Chris Li, Kairui Song, Linus Torvalds
Introduce a helper function to drop a page from the page cache if it is evictable, inactive and unreferenced. This can be used to drop used-once pages from the file cache with POSIX_FADV_NOREUSE. Signed-off-by: Andrea Righi <redacted> --- include/linux/swap.h | 1 + mm/swap.c | 24 ++++++++++++++++++++++++ 2 files changed, 25 insertions(+), 0 deletions(-)
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 3e60228..2e5d1b8 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h@@ -222,6 +222,7 @@ extern void lru_add_page_tail(struct zone* zone, struct page *page, struct page *page_tail); extern void activate_page(struct page *); extern void mark_page_accessed(struct page *); +extern void mark_page_usedonce(struct page *page); extern void lru_add_drain(void); extern int lru_add_drain_all(void); extern void rotate_reclaimable_page(struct page *page);
diff --git a/mm/swap.c b/mm/swap.c
index fff1ff7..2c19c92 100644
--- a/mm/swap.c
+++ b/mm/swap.c@@ -352,6 +352,30 @@ void activate_page(struct page *page) } #endif +/** + * mark_page_usedonce - handle used-once pages + * @page: the page set as used-once + * + * Drop a page from the page cache if it is evictable, inactive and + * unreferenced. + */ +void mark_page_usedonce(struct page *page) +{ + int ret; + + if (!PageLRU(page)) + return; + if (PageActive(page) || PageUnevictable(page) || PageReferenced(page)) + return; + if (lock_page_killable(page)) + return; + ret = invalidate_inode_page(page); + unlock_page(page); + if (!ret) + deactivate_page(page); +} +EXPORT_SYMBOL(mark_page_usedonce); + /* * Mark a page as having seen activity. *
--
1.7.5.4
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