summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorHugh Dickins <hugh@veritas.com>2009-01-06 14:39:41 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 15:59:04 -0800
commitb962716b459505a8d83aea313fea0abe76749f42 (patch)
treeb401e882f2ee8ff5a11209057496e603c211e8fe
parent60371d971a3d01afd102f0bbf2681f32ecc31d78 (diff)
downloadop-kernel-dev-b962716b459505a8d83aea313fea0abe76749f42.zip
op-kernel-dev-b962716b459505a8d83aea313fea0abe76749f42.tar.gz
mm: optimize get_scan_ratio for no swap
Rik suggests a simplified get_scan_ratio() for !CONFIG_SWAP. Yes, the gcc optimizer gives us that, when nr_swap_pages is #defined as 0L. Move usual declaration to swapfile.c: it never belonged in page_alloc.c. Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Acked-by: Rik van Riel <riel@redhat.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Robin Holt <holt@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/swap.h5
-rw-r--r--mm/page_alloc.c1
-rw-r--r--mm/swapfile.c1
-rw-r--r--mm/vmscan.c12
4 files changed, 10 insertions, 9 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h
index c0d23ac..3a31cc2 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -163,7 +163,6 @@ struct swap_list_t {
/* linux/mm/page_alloc.c */
extern unsigned long totalram_pages;
extern unsigned long totalreserve_pages;
-extern long nr_swap_pages;
extern unsigned int nr_free_buffer_pages(void);
extern unsigned int nr_free_pagecache_pages(void);
@@ -291,6 +290,7 @@ extern struct page *swapin_readahead(swp_entry_t, gfp_t,
struct vm_area_struct *vma, unsigned long addr);
/* linux/mm/swapfile.c */
+extern long nr_swap_pages;
extern long total_swap_pages;
extern void si_swapinfo(struct sysinfo *);
extern swp_entry_t get_swap_page(void);
@@ -331,7 +331,8 @@ static inline void disable_swap_token(void)
#else /* CONFIG_SWAP */
-#define total_swap_pages 0
+#define nr_swap_pages 0L
+#define total_swap_pages 0L
#define total_swapcache_pages 0UL
#define si_swapinfo(val) \
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ce2a026..6513343 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -69,7 +69,6 @@ EXPORT_SYMBOL(node_states);
unsigned long totalram_pages __read_mostly;
unsigned long totalreserve_pages __read_mostly;
-long nr_swap_pages;
int percpu_pagelist_fraction;
#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 9ce7f81..725e56c 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -35,6 +35,7 @@
static DEFINE_SPINLOCK(swap_lock);
static unsigned int nr_swapfiles;
+long nr_swap_pages;
long total_swap_pages;
static int swap_overflow;
static int least_priority;
diff --git a/mm/vmscan.c b/mm/vmscan.c
index f350523..d500b906 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1327,12 +1327,6 @@ static void get_scan_ratio(struct zone *zone, struct scan_control *sc,
unsigned long anon_prio, file_prio;
unsigned long ap, fp;
- anon = zone_page_state(zone, NR_ACTIVE_ANON) +
- zone_page_state(zone, NR_INACTIVE_ANON);
- file = zone_page_state(zone, NR_ACTIVE_FILE) +
- zone_page_state(zone, NR_INACTIVE_FILE);
- free = zone_page_state(zone, NR_FREE_PAGES);
-
/* If we have no swap space, do not bother scanning anon pages. */
if (nr_swap_pages <= 0) {
percent[0] = 0;
@@ -1340,6 +1334,12 @@ static void get_scan_ratio(struct zone *zone, struct scan_control *sc,
return;
}
+ anon = zone_page_state(zone, NR_ACTIVE_ANON) +
+ zone_page_state(zone, NR_INACTIVE_ANON);
+ file = zone_page_state(zone, NR_ACTIVE_FILE) +
+ zone_page_state(zone, NR_INACTIVE_FILE);
+ free = zone_page_state(zone, NR_FREE_PAGES);
+
/* If we have very few page cache pages, force-scan anon pages. */
if (unlikely(file + free <= zone->pages_high)) {
percent[0] = 100;
OpenPOWER on IntegriCloud