Pagetypeinfo is invaluable in observing the fragmentation of memory
into different migratetypes. Modify this code to also print out the
fragmentation statistics at a per-zone-memory-region granularity
(along with the existing per-zone reporting).
This helps us observe the effects of influencing memory allocation
decisions at the page-allocator level and understand the extent to
which they help in consolidation.
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
---
mm/vmstat.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 84 insertions(+), 2 deletions(-)
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 8e8c8bd..bb44d30 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -926,6 +926,35 @@ static void pagetypeinfo_showfree_print(struct seq_file *m,
}
}
+static void pagetypeinfo_showfree_region_print(struct seq_file *m,
+ pg_data_t *pgdat,
+ struct zone *zone)
+{
+ int order, mtype, i;
+
+ for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) {
+
+ for (i = 0; i < zone->nr_zone_regions; i++) {
+ seq_printf(m, "Node %4d, zone %8s, R%3d %12s ",
+ pgdat->node_id,
+ zone->name,
+ i,
+ migratetype_names[mtype]);
+
+ for (order = 0; order < MAX_ORDER; ++order) {
+ struct free_area *area;
+
+ area = &(zone->free_area[order]);
+
+ seq_printf(m, "%6lu ",
+ area->free_list[mtype].mr_list[i].nr_free);
+ }
+ seq_putc(m, '\n');
+ }
+
+ }
+}
+
/* Print out the free pages at each order for each migatetype */
static int pagetypeinfo_showfree(struct seq_file *m, void *arg)
{
@@ -940,6 +969,11 @@ static int pagetypeinfo_showfree(struct seq_file *m, void *arg)
walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print);
+ seq_putc(m, '\n');
+
+ /* Print the free pages at each migratetype, per memory region */
+ walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_region_print);
+
return 0;
}
@@ -971,24 +1005,72 @@ static void pagetypeinfo_showblockcount_print(struct seq_file *m,
}
/* Print counts */
- seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
+ seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
for (mtype = 0; mtype < MIGRATE_TYPES; mtype++)
seq_printf(m, "%12lu ", count[mtype]);
seq_putc(m, '\n');
}
+static void pagetypeinfo_showblockcount_region_print(struct seq_file *m,
+ pg_data_t *pgdat, struct zone *zone)
+{
+ int mtype, i;
+ unsigned long pfn;
+ unsigned long start_pfn, end_pfn;
+ unsigned long count[MIGRATE_TYPES] = { 0, };
+
+ for (i = 0; i < zone->nr_zone_regions; i++) {
+ start_pfn = zone->zone_regions[i].start_pfn;
+ end_pfn = zone->zone_regions[i].end_pfn;
+
+ for (pfn = start_pfn; pfn < end_pfn;
+ pfn += pageblock_nr_pages) {
+ struct page *page;
+
+ if (!pfn_valid(pfn))
+ continue;
+
+ page = pfn_to_page(pfn);
+
+ /* Watch for unexpected holes punched in the memmap */
+ if (!memmap_valid_within(pfn, page, zone))
+ continue;
+
+ mtype = get_pageblock_migratetype(page);
+
+ if (mtype < MIGRATE_TYPES)
+ count[mtype]++;
+ }
+
+ /* Print counts */
+ seq_printf(m, "Node %d, zone %8s R%3d ", pgdat->node_id,
+ zone->name, i);
+ for (mtype = 0; mtype < MIGRATE_TYPES; mtype++)
+ seq_printf(m, "%12lu ", count[mtype]);
+ seq_putc(m, '\n');
+
+ /* Reset the counters */
+ for (mtype = 0; mtype < MIGRATE_TYPES; mtype++)
+ count[mtype] = 0;
+ }
+}
+
/* Print out the free pages at each order for each migratetype */
static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg)
{
int mtype;
pg_data_t *pgdat = (pg_data_t *)arg;
- seq_printf(m, "\n%-23s", "Number of blocks type ");
+ seq_printf(m, "\n%-23s", "Number of blocks type ");
for (mtype = 0; mtype < MIGRATE_TYPES; mtype++)
seq_printf(m, "%12s ", migratetype_names[mtype]);
seq_putc(m, '\n');
walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print);
+ /* Print out the pageblock info for per memory region */
+ seq_putc(m, '\n');
+ walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_region_print);
+
return 0;
}
--
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