The patch titled Subject: mm, oom:dump_tasks add rss detailed information printing has been added to the -mm mm-unstable branch. Its filename is mm-oom-dump_tasks-add-rss-detailed-information-printing.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-oom-dump_tasks-add-rss-detailed-information-printing.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Yong Wang <wang.yong12@xxxxxxxxxx> Subject: mm, oom:dump_tasks add rss detailed information printing Date: Thu, 23 Nov 2023 18:40:18 +0800 (CST) When the system is under oom, it prints out the RSS information of each process. However, we don't know the size of rss_anon, rss_file, and rss_shmem. To distinguish the memory occupied by anonymous or file mappings or shmem, could help us identify the root cause of the oom. So this patch adds RSS details, which refers to the /proc/<pid>/status[1]. It can help us know more about process memory usage. Example of oom including the new rss_* fields: [ 1630.902466] Tasks state (memory values in pages): [ 1630.902870] [ pid ] uid tgid total_vm rss rss_anon rss_file rss_shmem pgtables_bytes swapents oom_score_adj name [ 1630.903619] [ 149] 0 149 486 288 0 288 0 36864 0 0 ash [ 1630.904210] [ 156] 0 156 153531 153345 153345 0 0 1269760 0 0 mm_test [1] commit 8cee852ec53f ("mm, procfs: breakdown RSS for anon, shmem and file in /proc/pid/status"). Link: https://lkml.kernel.org/r/202311231840181856667@xxxxxxxxxx Signed-off-by: Yong Wang <wang.yong12@xxxxxxxxxx> Reviewed-by: Yang Yang <yang.yang29@xxxxxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Xuexin Jiang <jiang.xuexin@xxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/oom_kill.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/mm/oom_kill.c~mm-oom-dump_tasks-add-rss-detailed-information-printing +++ a/mm/oom_kill.c @@ -399,10 +399,11 @@ static int dump_task(struct task_struct return 0; } - pr_info("[%7d] %5d %5d %8lu %8lu %8ld %8lu %5hd %s\n", + pr_info("[%7d] %5d %5d %8lu %8lu %8lu %8lu %9lu %8ld %8lu %5hd %s\n", task->pid, from_kuid(&init_user_ns, task_uid(task)), task->tgid, task->mm->total_vm, get_mm_rss(task->mm), - mm_pgtables_bytes(task->mm), + get_mm_counter(task->mm, MM_ANONPAGES), get_mm_counter(task->mm, MM_FILEPAGES), + get_mm_counter(task->mm, MM_SHMEMPAGES), mm_pgtables_bytes(task->mm), get_mm_counter(task->mm, MM_SWAPENTS), task->signal->oom_score_adj, task->comm); task_unlock(task); @@ -423,7 +424,7 @@ static int dump_task(struct task_struct static void dump_tasks(struct oom_control *oc) { pr_info("Tasks state (memory values in pages):\n"); - pr_info("[ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name\n"); + pr_info("[ pid ] uid tgid total_vm rss rss_anon rss_file rss_shmem pgtables_bytes swapents oom_score_adj name\n"); if (is_memcg_oom(oc)) mem_cgroup_scan_tasks(oc->memcg, dump_task, oc); _ Patches currently in -mm which might be from wang.yong12@xxxxxxxxxx are mm-oom-dump_tasks-add-rss-detailed-information-printing.patch