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-rw-r--r--mm/page_owner.c93
1 files changed, 91 insertions, 2 deletions
diff --git a/mm/page_owner.c b/mm/page_owner.c
index 85eec7ea6735..9ab4a9b5bc09 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -10,6 +10,8 @@
static bool page_owner_disabled = true;
bool page_owner_inited __read_mostly;
+static void init_early_allocated_pages(void);
+
static int early_page_owner_param(char *buf)
{
if (!buf)
@@ -36,6 +38,7 @@ static void init_page_owner(void)
return;
page_owner_inited = true;
+ init_early_allocated_pages();
}
struct page_ext_operations page_owner_ops = {
@@ -184,8 +187,8 @@ read_page_owner(struct file *file, char __user *buf, size_t count, loff_t *ppos)
page_ext = lookup_page_ext(page);
/*
- * Pages allocated before initialization of page_owner are
- * non-buddy and have no page_owner info.
+ * Some pages could be missed by concurrent allocation or free,
+ * because we don't hold the zone lock.
*/
if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags))
continue;
@@ -199,6 +202,92 @@ read_page_owner(struct file *file, char __user *buf, size_t count, loff_t *ppos)
return 0;
}
+static void init_pages_in_zone(pg_data_t *pgdat, struct zone *zone)
+{
+ struct page *page;
+ struct page_ext *page_ext;
+ unsigned long pfn = zone->zone_start_pfn, block_end_pfn;
+ unsigned long end_pfn = pfn + zone->spanned_pages;
+ unsigned long count = 0;
+
+ /* Scan block by block. First and last block may be incomplete */
+ pfn = zone->zone_start_pfn;
+
+ /*
+ * Walk the zone in pageblock_nr_pages steps. If a page block spans
+ * a zone boundary, it will be double counted between zones. This does
+ * not matter as the mixed block count will still be correct
+ */
+ for (; pfn < end_pfn; ) {
+ if (!pfn_valid(pfn)) {
+ pfn = ALIGN(pfn + 1, MAX_ORDER_NR_PAGES);
+ continue;
+ }
+
+ block_end_pfn = ALIGN(pfn + 1, pageblock_nr_pages);
+ block_end_pfn = min(block_end_pfn, end_pfn);
+
+ page = pfn_to_page(pfn);
+
+ for (; pfn < block_end_pfn; pfn++) {
+ if (!pfn_valid_within(pfn))
+ continue;
+
+ page = pfn_to_page(pfn);
+
+ /*
+ * We are safe to check buddy flag and order, because
+ * this is init stage and only single thread runs.
+ */
+ if (PageBuddy(page)) {
+ pfn += (1UL << page_order(page)) - 1;
+ continue;
+ }
+
+ if (PageReserved(page))
+ continue;
+
+ page_ext = lookup_page_ext(page);
+
+ /* Maybe overraping zone */
+ if (test_bit(PAGE_EXT_OWNER, &page_ext->flags))
+ continue;
+
+ /* Found early allocated page */
+ set_page_owner(page, 0, 0);
+ count++;
+ }
+ }
+
+ pr_info("Node %d, zone %8s: page owner found early allocated %lu pages\n",
+ pgdat->node_id, zone->name, count);
+}
+
+static void init_zones_in_node(pg_data_t *pgdat)
+{
+ struct zone *zone;
+ struct zone *node_zones = pgdat->node_zones;
+ unsigned long flags;
+
+ for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
+ if (!populated_zone(zone))
+ continue;
+
+ spin_lock_irqsave(&zone->lock, flags);
+ init_pages_in_zone(pgdat, zone);
+ spin_unlock_irqrestore(&zone->lock, flags);
+ }
+}
+
+static void init_early_allocated_pages(void)
+{
+ pg_data_t *pgdat;
+
+ drain_all_pages(NULL);
+ for_each_online_pgdat(pgdat)
+ init_zones_in_node(pgdat);
+}
+
static const struct file_operations proc_page_owner_operations = {
.read = read_page_owner,
};