linux-kernel - [RFC/PATCH 1/3] swap: allow adding of pages to tail of anonymous inactive queue

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed,  3 Oct 2012 15:43:52 -0700
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	ngupta@...are.org, konrad.wilk@...cle.com,
	sjenning@...ux.vnet.ibm.com, minchan@...nel.org, hughd@...gle.com,
	akpm@...ux-foundation.org, riel@...hat.com, hannes@...xchg.org,
	dan.magenheimer@...cle.com, aarcange@...hat.com, mgorman@...e.de,
	gregkh@...uxfoundation.org
Subject: [RFC/PATCH 1/3] swap: allow adding of pages to tail of anonymous inactive queue

When moving a page of anonymous data out of zcache and back
into swap cache, such pages are VERY inactive, and we want
them to be swapped to disk ASAP.  So we need to add them
at the tail of the proper queue.

Signed-off-by: Dan Magenheimer <dan.magenheimer@...cle.com>
---
 include/linux/swap.h |   10 ++++++++++
 mm/swap.c            |   16 ++++++++++++++++
 2 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 388e706..d3c7281 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -225,6 +225,7 @@ extern unsigned int nr_free_pagecache_pages(void);
 
 /* linux/mm/swap.c */
 extern void __lru_cache_add(struct page *, enum lru_list lru);
+extern void __lru_cache_add_tail(struct page *, enum lru_list lru);
 extern void lru_cache_add_lru(struct page *, enum lru_list lru);
 extern void lru_add_page_tail(struct page *page, struct page *page_tail,
 			      struct lruvec *lruvec);
@@ -247,6 +248,15 @@ static inline void lru_cache_add_anon(struct page *page)
 {
 	__lru_cache_add(page, LRU_INACTIVE_ANON);
 }
+ 
+/**
+ * lru_cache_add_tail: add a page to the tail of the page lists
+ * @page: the page to add
+ */
+static inline void lru_cache_add_anon_tail(struct page *page)
+{
+	__lru_cache_add_tail(page, LRU_INACTIVE_ANON);
+}
 
 static inline void lru_cache_add_file(struct page *page)
 {
diff --git a/mm/swap.c b/mm/swap.c
index 7782588..67216d8 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -456,6 +456,22 @@ void __lru_cache_add(struct page *page, enum lru_list lru)
 	put_cpu_var(lru_add_pvecs);
 }
 EXPORT_SYMBOL(__lru_cache_add);
+ 
+void __lru_cache_add_tail(struct page *page, enum lru_list lru)
+{
+	struct pagevec *pvec = &get_cpu_var(lru_add_pvecs)[lru];
+	unsigned long flags;
+
+	page_cache_get(page);
+	if (!pagevec_add(pvec, page)) {
+		__pagevec_lru_add(pvec, lru);
+		local_irq_save(flags);
+		pagevec_move_tail(pvec);
+		local_irq_restore(flags);
+	}
+	put_cpu_var(lru_add_pvecs);
+}
+EXPORT_SYMBOL(__lru_cache_add_tail);
 
 /**
  * lru_cache_add_lru - add a page to a page list
-- 
1.7.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/