short last_migrate_reason;
gfp_t gfp_mask;
depot_stack_handle_t handle;
+#ifdef CONFIG_DEBUG_PAGEALLOC
+ depot_stack_handle_t free_handle;
+#endif
};
static bool page_owner_disabled = true;
return (void *)page_ext + page_owner_ops.offset;
}
-void __reset_page_owner(struct page *page, unsigned int order)
-{
- int i;
- struct page_ext *page_ext;
-
- for (i = 0; i < (1 << order); i++) {
- page_ext = lookup_page_ext(page + i);
- if (unlikely(!page_ext))
- continue;
- __clear_bit(PAGE_EXT_OWNER, &page_ext->flags);
- }
-}
-
static inline bool check_recursive_alloc(unsigned long *entries,
unsigned int nr_entries,
unsigned long ip)
return handle;
}
+void __reset_page_owner(struct page *page, unsigned int order)
+{
+ int i;
+ struct page_ext *page_ext;
+#ifdef CONFIG_DEBUG_PAGEALLOC
+ depot_stack_handle_t handle = 0;
+ struct page_owner *page_owner;
+
+ if (debug_pagealloc_enabled())
+ handle = save_stack(GFP_NOWAIT | __GFP_NOWARN);
+#endif
+
+ for (i = 0; i < (1 << order); i++) {
+ page_ext = lookup_page_ext(page + i);
+ if (unlikely(!page_ext))
+ continue;
+ __clear_bit(PAGE_EXT_OWNER_ACTIVE, &page_ext->flags);
+#ifdef CONFIG_DEBUG_PAGEALLOC
+ if (debug_pagealloc_enabled()) {
+ page_owner = get_page_owner(page_ext);
+ page_owner->free_handle = handle;
+ }
+#endif
+ }
+}
+
static inline void __set_page_owner_handle(struct page *page,
struct page_ext *page_ext, depot_stack_handle_t handle,
unsigned int order, gfp_t gfp_mask)
page_owner->gfp_mask = gfp_mask;
page_owner->last_migrate_reason = -1;
__set_bit(PAGE_EXT_OWNER, &page_ext->flags);
+ __set_bit(PAGE_EXT_OWNER_ACTIVE, &page_ext->flags);
page_ext = lookup_page_ext(page + i);
}
* the new page, which will be freed.
*/
__set_bit(PAGE_EXT_OWNER, &new_ext->flags);
+ __set_bit(PAGE_EXT_OWNER_ACTIVE, &new_ext->flags);
}
void pagetypeinfo_showmixedcount_print(struct seq_file *m,
if (unlikely(!page_ext))
continue;
- if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags))
+ if (!test_bit(PAGE_EXT_OWNER_ACTIVE, &page_ext->flags))
continue;
page_owner = get_page_owner(page_ext);
mt = gfpflags_to_migratetype(gfp_mask);
if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags)) {
- pr_alert("page_owner info is not active (free page?)\n");
+ pr_alert("page_owner info is not present (never set?)\n");
return;
}
+ if (test_bit(PAGE_EXT_OWNER_ACTIVE, &page_ext->flags))
+ pr_alert("page_owner tracks the page as allocated\n");
+ else
+ pr_alert("page_owner tracks the page as freed\n");
+
+ pr_alert("page last allocated via order %u, migratetype %s, gfp_mask %#x(%pGg)\n",
+ page_owner->order, migratetype_names[mt], gfp_mask, &gfp_mask);
+
handle = READ_ONCE(page_owner->handle);
if (!handle) {
- pr_alert("page_owner info is not active (free page?)\n");
- return;
+ pr_alert("page_owner allocation stack trace missing\n");
+ } else {
+ nr_entries = stack_depot_fetch(handle, &entries);
+ stack_trace_print(entries, nr_entries, 0);
}
- nr_entries = stack_depot_fetch(handle, &entries);
- pr_alert("page allocated via order %u, migratetype %s, gfp_mask %#x(%pGg)\n",
- page_owner->order, migratetype_names[mt], gfp_mask, &gfp_mask);
- stack_trace_print(entries, nr_entries, 0);
+#ifdef CONFIG_DEBUG_PAGEALLOC
+ handle = READ_ONCE(page_owner->free_handle);
+ if (!handle) {
+ pr_alert("page_owner free stack trace missing\n");
+ } else {
+ nr_entries = stack_depot_fetch(handle, &entries);
+ pr_alert("page last free stack trace:\n");
+ stack_trace_print(entries, nr_entries, 0);
+ }
+#endif
if (page_owner->last_migrate_reason != -1)
pr_alert("page has been migrated, last migrate reason: %s\n",
if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags))
continue;
+ /*
+ * Although we do have the info about past allocation of free
+ * pages, it's not relevant for current memory usage.
+ */
+ if (!test_bit(PAGE_EXT_OWNER_ACTIVE, &page_ext->flags))
+ continue;
+
page_owner = get_page_owner(page_ext);
/*