From 05a421995503b746095d8ac93fa0ddadfc3c81bc Mon Sep 17 00:00:00 2001 From: Hyeonggon Yoo <42.hyeyoo@gmail.com> Date: Sun, 22 Jan 2023 01:50:54 +0900 Subject: [PATCH] mm/page_owner: record single timestamp value for high order allocations When allocating a high-order page, separate allocation timestamp is recorded for each sub-page resulting in different timestamp values between them. This behavior is not consistent with the behavior when recording free timestamp and caused confusion when analyzing memory dumps. Record single timestamp for the entire allocation, aligning with the behavior for free timestamps. Link: https://lkml.kernel.org/r/20230121165054.520507-1-42.hyeyoo@gmail.com Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: David Hildenbrand Cc: David Rientjes Cc: Joonsoo Kim Cc: Michal Hocko Cc: Mike Rapoport Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- mm/page_owner.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/page_owner.c b/mm/page_owner.c index f0553be..80dc8f4 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -163,6 +163,7 @@ static inline void __set_page_owner_handle(struct page_ext *page_ext, { struct page_owner *page_owner; int i; + u64 ts_nsec = local_clock(); for (i = 0; i < (1 << order); i++) { page_owner = get_page_owner(page_ext); @@ -172,7 +173,7 @@ static inline void __set_page_owner_handle(struct page_ext *page_ext, page_owner->last_migrate_reason = -1; page_owner->pid = current->pid; page_owner->tgid = current->tgid; - page_owner->ts_nsec = local_clock(); + page_owner->ts_nsec = ts_nsec; strscpy(page_owner->comm, current->comm, sizeof(page_owner->comm)); __set_bit(PAGE_EXT_OWNER, &page_ext->flags); -- 2.7.4