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authorNick Piggin <nickpiggin@yahoo.com.au>2006-01-06 00:11:20 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:33:29 -0800
commita74609fafa2e5cc31d558012abaaa55ec9ad9da4 (patch)
tree0be653692864d99da345b575dfe2083994ee1d21 /mm/vmscan.c
parentd3cb487149bd706aa6aeb02042332a450978dc1c (diff)
downloadlwn-a74609fafa2e5cc31d558012abaaa55ec9ad9da4.tar.gz
lwn-a74609fafa2e5cc31d558012abaaa55ec9ad9da4.zip
[PATCH] mm: page_state opt
Optimise page_state manipulations by introducing interrupt unsafe accessors to page_state fields. Callers must provide their own locking (either disable interrupts or not update from interrupt context). Switch over the hot callsites that can easily be moved under interrupts off sections. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c27
1 files changed, 15 insertions, 12 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 7681d8ee04fe..be8235fb1939 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -645,16 +645,17 @@ static void shrink_cache(struct zone *zone, struct scan_control *sc)
goto done;
max_scan -= nr_scan;
- if (current_is_kswapd())
- mod_page_state_zone(zone, pgscan_kswapd, nr_scan);
- else
- mod_page_state_zone(zone, pgscan_direct, nr_scan);
nr_freed = shrink_list(&page_list, sc);
- if (current_is_kswapd())
- mod_page_state(kswapd_steal, nr_freed);
- mod_page_state_zone(zone, pgsteal, nr_freed);
- spin_lock_irq(&zone->lru_lock);
+ local_irq_disable();
+ if (current_is_kswapd()) {
+ __mod_page_state_zone(zone, pgscan_kswapd, nr_scan);
+ __mod_page_state(kswapd_steal, nr_freed);
+ } else
+ __mod_page_state_zone(zone, pgscan_direct, nr_scan);
+ __mod_page_state_zone(zone, pgsteal, nr_freed);
+
+ spin_lock(&zone->lru_lock);
/*
* Put back any unfreeable pages.
*/
@@ -816,11 +817,13 @@ refill_inactive_zone(struct zone *zone, struct scan_control *sc)
}
}
zone->nr_active += pgmoved;
- spin_unlock_irq(&zone->lru_lock);
- pagevec_release(&pvec);
+ spin_unlock(&zone->lru_lock);
+
+ __mod_page_state_zone(zone, pgrefill, pgscanned);
+ __mod_page_state(pgdeactivate, pgdeactivate);
+ local_irq_enable();
- mod_page_state_zone(zone, pgrefill, pgscanned);
- mod_page_state(pgdeactivate, pgdeactivate);
+ pagevec_release(&pvec);
}
/*