Hi Daniel
> > Thank you for good point out!
> > Could you please post your test program and reproduced method?
>
> Sure:
>
> 1. Fill almost all available memory with page cache in a system without swap.
> 2. Run attached alloc-test program.
> 3. Notification fires when page cache is reclaimed.
Unfortunately, I can't reproduce it.
my machine
CPU: Pentium4 2.8GHz with HT
memory: 512M
1. I doubt ZONE_DMA, please shipment ignore zone_dma patch(below).
2. Could you please send your .config and /etc/sysctl.conf?
I hope more reproduce challenge.
thanks.
- kosaki
Signed-off-by: KOSAKI Motohiro <[EMAIL PROTECTED]>
---
include/linux/mem_notify.h | 3 +++
mm/page_alloc.c | 6 +++++-
2 files changed, 8 insertions(+), 1 deletion(-)
Index: linux-2.6.24-rc6-mm1-memnotify/include/linux/mem_notify.h
===================================================================
--- linux-2.6.24-rc6-mm1-memnotify.orig/include/linux/mem_notify.h
2008-01-16 21:31:09.000000000 +0900
+++ linux-2.6.24-rc6-mm1-memnotify/include/linux/mem_notify.h
2008-01-16 21:34:24.000000000 +0900
@@ -22,6 +22,9 @@ static inline void memory_pressure_notif
unsigned long target;
unsigned long pages_high, pages_free, pages_reserve;
+ if (unlikely(zone->mem_notify_status == -1))
+ return;
+
if (pressure) {
target = atomic_long_read(&last_mem_notify) + MEM_NOTIFY_FREQ;
if (likely(time_before(jiffies, target)))
Index: linux-2.6.24-rc6-mm1-memnotify/mm/page_alloc.c
===================================================================
--- linux-2.6.24-rc6-mm1-memnotify.orig/mm/page_alloc.c 2008-01-13
19:50:27.000000000 +0900
+++ linux-2.6.24-rc6-mm1-memnotify/mm/page_alloc.c 2008-01-16
21:41:58.000000000 +0900
@@ -3467,7 +3467,11 @@ static void __meminit free_area_init_cor
zone->zone_pgdat = pgdat;
zone->prev_priority = DEF_PRIORITY;
- zone->mem_notify_status = 0;
+
+ if (zone->present_pages < (pgdat->node_present_pages / 10))
+ zone->mem_notify_status = -1;
+ else
+ zone->mem_notify_status = 0;
zone_pcp_init(zone);
INIT_LIST_HEAD(&zone->active_list);
--
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