Commit 881388f3 authored by Xuanye Liu's avatar Xuanye Liu Committed by Andrew Morton
Browse files

mm: add process info to bad rss-counter warning 

Enhance the debugging information in check_mm() by including the process
name and PID when reporting bad rss-counter states.  This helps identify
which process is associated with the memory accounting issue.

Link: https://lkml.kernel.org/r/20250723100901.1909683-1-liuqiye2025@163.com


Signed-off-by: default avatarXuanye Liu <liuqiye2025@163.com>
Acked-by: default avatarSeongJae Park <sj@kernel.org>
Cc: Ben Segall <bsegall@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mel Gorman <mgorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 56bdf83d

kernel/fork.c

+6 −3
Original line number Diff line number Diff line
@@ -585,9 +585,12 @@ static void check_mm(struct mm_struct *mm) 
	for (i = 0; i < NR_MM_COUNTERS; i++) {

		long x = percpu_counter_sum(&mm->rss_stat[i]);



		if (unlikely(x))

			pr_alert("BUG: Bad rss-counter state mm:%p type:%s val:%ld\n",

				 mm, resident_page_types[i], x);

		if (unlikely(x)) {

			pr_alert("BUG: Bad rss-counter state mm:%p type:%s val:%ld Comm:%s Pid:%d\n",

				 mm, resident_page_types[i], x,

				 current->comm,

				 task_pid_nr(current));

		}

	}



	if (mm_pgtables_bytes(mm))