From 2332dc7870b6f40eff03df88cbb03f4ffddbd086 Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Wed, 23 Jun 2004 18:53:40 -0700 Subject: [PATCH] vmscan.c scan rate fixes We've been futzing with the scan rates of the inactive and active lists far too much, and it's still not right (Anton reports interrupt-off times of over a second). - We have this logic in there from 2.4.early (at least) which tries to keep the inactive list 1/3rd the size of the active list. Or something. I really cannot see any logic behind this, so toss it out and change the arithmetic in there so that all pages on both lists have equal scan rates. - Chunk the work up so we never hold interrupts off for more that 32 pages worth of scanning. - Make the per-zone scan-count accumulators unsigned long rather than atomic_t. Mainly because atomic_t's could conceivably overflow, but also because access to these counters is racy-by-design anyway. Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/mmzone.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'include/linux') diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 373a13ba6f3f..2f41b635580b 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -118,8 +118,8 @@ struct zone { spinlock_t lru_lock; struct list_head active_list; struct list_head inactive_list; - atomic_t nr_scan_active; - atomic_t nr_scan_inactive; + unsigned long nr_scan_active; + unsigned long nr_scan_inactive; unsigned long nr_active; unsigned long nr_inactive; int all_unreclaimable; /* All pages pinned */ -- cgit v1.2.3