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Date: Tue, 21 Nov 2006 22:53:03 +0000 (GMT)
From: Mel Gorman <mel@....ul.ie>
To: linux-mm@...ck.org
Cc: Mel Gorman <mel@....ul.ie>, linux-kernel@...r.kernel.org,
clameter@....com
Subject: [PATCH 8/11] [DEBUG] Add statistics
This patch is strictly debug only. It outputs some information to
/proc/buddyinfo that may help explain what went wrong if page clustering
totally breaks down and prints out a trace when fallbacks occur to help
determine if allocation flagging is incomplete.
Signed-off-by: Mel Gorman <mel@....ul.ie>
---
page_alloc.c | 32 ++++++++++++++++++++++++++++++++
vmstat.c | 16 ++++++++++++++++
2 files changed, 48 insertions(+)
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-008_reclaimable/mm/page_alloc.c linux-2.6.19-rc5-mm2-009_stats/mm/page_alloc.c
--- linux-2.6.19-rc5-mm2-008_reclaimable/mm/page_alloc.c 2006-11-21 10:57:46.000000000 +0000
+++ linux-2.6.19-rc5-mm2-009_stats/mm/page_alloc.c 2006-11-21 11:52:40.000000000 +0000
@@ -58,6 +58,10 @@ unsigned long totalram_pages __read_most
unsigned long totalreserve_pages __read_mostly;
long nr_swap_pages;
int percpu_pagelist_fraction;
+#ifdef CONFIG_PAGE_CLUSTERING
+int split_count[MIGRATE_TYPES];
+int fallback_counts[MIGRATE_TYPES];
+#endif /* CONFIG_PAGE_CLUSTERING */
static void __free_pages_ok(struct page *page, unsigned int order);
@@ -84,6 +88,8 @@ int sysctl_lowmem_reserve_ratio[MAX_NR_Z
#endif
};
+static int printfallback_count;
+
EXPORT_SYMBOL(totalram_pages);
static char *zone_names[MAX_NR_ZONES] = {
@@ -750,6 +756,27 @@ static struct page *__rmqueue_fallback(s
struct page, lru);
area->nr_free--;
+ /* Account for a MAX_ORDER block being split */
+ if (current_order == MAX_ORDER - 1 &&
+ order < MAX_ORDER - 1) {
+ split_count[start_migratetype]++;
+ }
+
+ /* Account for fallbacks of interest */
+ if (order < HUGETLB_PAGE_ORDER &&
+ current_order != MAX_ORDER - 1) {
+ fallback_counts[start_migratetype]++;
+ if (printfallback_count < 500 && start_migratetype != MIGRATE_MOVABLE) {
+ printfallback_count++;
+ printk("ALLOC FALLBACK %d TYPE %d TO %d ZONE %s\n", printfallback_count, start_migratetype, migratetype, zone->name);
+ printk("===========================\n");
+ dump_stack();
+ printk("===========================\n");
+ }
+
+
+ }
+
/* Remove the page from the freelists */
list_del(&page->lru);
rmv_page_order(page);
@@ -805,6 +832,11 @@ static struct page *__rmqueue(struct zon
if (list_empty(&area->free_list[migratetype]))
continue;
+#ifdef CONFIG_PAGE_CLUSTERING
+ if (current_order == MAX_ORDER - 1 && order < MAX_ORDER - 1)
+ split_count[migratetype]++;
+#endif /* CONFIG_PAGE_CLUSTERING */
+
page = list_entry(area->free_list[migratetype].next,
struct page, lru);
list_del(&page->lru);
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.19-rc5-mm2-008_reclaimable/mm/vmstat.c linux-2.6.19-rc5-mm2-009_stats/mm/vmstat.c
--- linux-2.6.19-rc5-mm2-008_reclaimable/mm/vmstat.c 2006-11-14 14:01:37.000000000 +0000
+++ linux-2.6.19-rc5-mm2-009_stats/mm/vmstat.c 2006-11-21 10:59:36.000000000 +0000
@@ -13,6 +13,11 @@
#include <linux/module.h>
#include <linux/cpu.h>
+#ifdef CONFIG_PAGE_CLUSTERING
+extern int split_count[MIGRATE_TYPES];
+extern int fallback_counts[MIGRATE_TYPES];
+#endif /* CONFIG_PAGE_CLUSTERING */
+
void __get_zone_counts(unsigned long *active, unsigned long *inactive,
unsigned long *free, struct pglist_data *pgdat)
{
@@ -403,6 +408,17 @@ static void *frag_next(struct seq_file *
static void frag_stop(struct seq_file *m, void *arg)
{
+#ifdef CONFIG_PAGE_CLUSTERING
+ seq_printf(m, "Fallback counts\n");
+ seq_printf(m, "Unmovable: %8d\n", fallback_counts[MIGRATE_UNMOVABLE]);
+ seq_printf(m, "Reclaim: %8d\n", fallback_counts[MIGRATE_RECLAIMABLE]);
+ seq_printf(m, "Movable: %8d\n", fallback_counts[MIGRATE_MOVABLE]);
+
+ seq_printf(m, "\nSplit counts\n");
+ seq_printf(m, "Unmovable: %8d\n", split_count[MIGRATE_UNMOVABLE]);
+ seq_printf(m, "Reclaim: %8d\n", split_count[MIGRATE_RECLAIMABLE]);
+ seq_printf(m, "Movable: %8d\n", split_count[MIGRATE_MOVABLE]);
+#endif /* CONFIG_PAGE_CLUSTERING */
}
/*
-
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