From b69408e88bd86b98feb7b9a38fd865e1ddb29827 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Sat, 18 Oct 2008 20:26:14 -0700 Subject: vmscan: Use an indexed array for LRU variables Currently we are defining explicit variables for the inactive and active list. An indexed array can be more generic and avoid repeating similar code in several places in the reclaim code. We are saving a few bytes in terms of code size: Before: text data bss dec hex filename 4097753 573120 4092484 8763357 85b7dd vmlinux After: text data bss dec hex filename 4097729 573120 4092484 8763333 85b7c5 vmlinux Having an easy way to add new lru lists may ease future work on the reclaim code. Signed-off-by: Rik van Riel Signed-off-by: Lee Schermerhorn Signed-off-by: Christoph Lameter Signed-off-by: KOSAKI Motohiro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/mmzone.h | 26 ++++++++++++++++++++------ 1 file changed, 20 insertions(+), 6 deletions(-) (limited to 'include/linux/mmzone.h') diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 428328a05fa1..156e18f3919b 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -81,8 +81,9 @@ struct zone_padding { enum zone_stat_item { /* First 128 byte cacheline (assuming 64 bit words) */ NR_FREE_PAGES, - NR_INACTIVE, - NR_ACTIVE, + NR_LRU_BASE, + NR_INACTIVE = NR_LRU_BASE, /* must match order of LRU_[IN]ACTIVE */ + NR_ACTIVE, /* " " " " " */ NR_ANON_PAGES, /* Mapped anonymous pages */ NR_FILE_MAPPED, /* pagecache pages mapped into pagetables. only modified from process context */ @@ -107,6 +108,19 @@ enum zone_stat_item { #endif NR_VM_ZONE_STAT_ITEMS }; +enum lru_list { + LRU_BASE, + LRU_INACTIVE=LRU_BASE, /* must match order of NR_[IN]ACTIVE */ + LRU_ACTIVE, /* " " " " " */ + NR_LRU_LISTS }; + +#define for_each_lru(l) for (l = 0; l < NR_LRU_LISTS; l++) + +static inline int is_active_lru(enum lru_list l) +{ + return (l == LRU_ACTIVE); +} + struct per_cpu_pages { int count; /* number of pages in the list */ int high; /* high watermark, emptying needed */ @@ -251,10 +265,10 @@ struct zone { /* Fields commonly accessed by the page reclaim scanner */ spinlock_t lru_lock; - struct list_head active_list; - struct list_head inactive_list; - unsigned long nr_scan_active; - unsigned long nr_scan_inactive; + struct { + struct list_head list; + unsigned long nr_scan; + } lru[NR_LRU_LISTS]; unsigned long pages_scanned; /* since last reclaim */ unsigned long flags; /* zone flags, see below */ -- cgit v1.2.2