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| author | Hugh Dickins <hugh@veritas.com> | 2009-01-06 14:39:41 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-06 15:59:04 -0800 |
| commit | b962716b459505a8d83aea313fea0abe76749f42 (patch) | |
| tree | b401e882f2ee8ff5a11209057496e603c211e8fe /mm/vmscan.c | |
| parent | 60371d971a3d01afd102f0bbf2681f32ecc31d78 (diff) | |
| download | op-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>
Diffstat (limited to 'mm/vmscan.c')
| -rw-r--r-- | mm/vmscan.c | 12 |
1 files changed, 6 insertions, 6 deletions
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; |
