From f7d304343b9d2456ffba23b99d2345408251ea45 Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Sun, 12 Mar 2023 14:26:04 +0300 Subject: mm: Expose untagging mask in /proc/$PID/status Add a line in /proc/$PID/status to report untag_mask. It can be used to find out LAM status of the process from the outside. It is useful for debuggers. Signed-off-by: Kirill A. Shutemov Signed-off-by: Dave Hansen Acked-by: Catalin Marinas Acked-by: Peter Zijlstra (Intel) Tested-by: Alexander Potapenko Link: https://lore.kernel.org/all/20230312112612.31869-10-kirill.shutemov%40linux.intel.com --- fs/proc/array.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'fs/proc/array.c') diff --git a/fs/proc/array.c b/fs/proc/array.c index 9b0315d34c58..6daea628bc76 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -91,6 +91,7 @@ #include #include #include +#include #include #include "internal.h" @@ -423,6 +424,11 @@ static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm) seq_printf(m, "THP_enabled:\t%d\n", thp_enabled); } +static inline void task_untag_mask(struct seq_file *m, struct mm_struct *mm) +{ + seq_printf(m, "untag_mask:\t%#lx\n", mm_untag_mask(mm)); +} + int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { @@ -438,6 +444,7 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, task_mem(m, mm); task_core_dumping(m, task); task_thp_status(m, mm); + task_untag_mask(m, mm); mmput(mm); } task_sig(m, task); -- cgit v1.2.3