diff options
authorMinchan Kim <>2021-04-29 23:01:30 -0700
committerLinus Torvalds <>2021-04-30 11:20:43 -0700
commita1394bddf9b60e96d075d94b71a8857696598186 (patch)
parent5f076944f06988391a6dbd458fc6485a71088e57 (diff)
mm: page_alloc: dump migrate-failed pages
Currently, debugging CMA allocation failures is quite limited. The most common source of these failures seems to be page migration which doesn't provide any useful information on the reason of the failure by itself. alloc_contig_range can report those failures as it holds a list of migrate-failed pages. The information logged by dump_page() has already proven helpful for debugging allocation issues, like identifying long-term pinnings on ZONE_MOVABLE or MIGRATE_CMA. Let's use the dynamic debugging infrastructure, such that we avoid flooding the logs and creating a lot of noise on frequent alloc_contig_range() calls. This information is helpful for debugging only. There are two ifdefery conditions to support common dyndbg options: - CONFIG_DYNAMIC_DEBUG_CORE && DYNAMIC_DEBUG_MODULE It aims for supporting the feature with only specific file with adding ccflags. - CONFIG_DYNAMIC_DEBUG It aims for supporting the feature with system wide globally. A simple example to enable the feature: Admin could enable the dump like this(by default, disabled) echo "func alloc_contig_dump_pages +p" > control Admin could disable it. echo "func alloc_contig_dump_pages =_" > control Detail goes Documentation/admin-guide/dynamic-debug-howto.rst A concern is utility functions in dump_page use inconsistent loglevels. In the future, we might want to make the loglevels used inside dump_page() consistent and eventually rework the way we log the information here. See [1]. [1] Link: Signed-off-by: Minchan Kim <> Reviewed-by: David Hildenbrand <> Cc: John Dias <> Cc: Michal Hocko <> Cc: David Hildenbrand <> Cc: Jason Baron <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
1 files changed, 22 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fce4b9180bdb..4a9f3950ef0f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8497,6 +8497,27 @@ static unsigned long pfn_max_align_up(unsigned long pfn)
+#if defined(CONFIG_DYNAMIC_DEBUG) || \
+/* Usage: See admin-guide/dynamic-debug-howto.rst */
+static void alloc_contig_dump_pages(struct list_head *page_list)
+ DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, "migrate failure");
+ if (DYNAMIC_DEBUG_BRANCH(descriptor)) {
+ struct page *page;
+ dump_stack();
+ list_for_each_entry(page, page_list, lru)
+ dump_page(page, "migration failure");
+ }
+static inline void alloc_contig_dump_pages(struct list_head *page_list)
/* [start, end) must belong to a single zone. */
static int __alloc_contig_migrate_range(struct compact_control *cc,
unsigned long start, unsigned long end)
@@ -8540,6 +8561,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
NULL, (unsigned long)&mtc, cc->mode, MR_CONTIG_RANGE);
if (ret < 0) {
+ alloc_contig_dump_pages(&cc->migratepages);
return ret;