stack usage: add pid to warning printk in check_stack_usage

In embedded systems, sometimes the same program (busybox) is the cause of
multiple warnings.  Outputting the pid with the program name in the
warning printk helps distinguish which instances of a program are using
the stack most.

This is a small patch, but useful.

Signed-off-by: Tim Bird <tim.bird@am.sony.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/exit.c b/kernel/exit.c
index 3281493ce7adfa1090800c9376081c43ed36cae2..6d85655353e919fd56e0d2cc65cb36862e328a8c 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -884,9 +884,9 @@ static void check_stack_usage(void)
 
        spin_lock(&low_water_lock);
        if (free < lowest_to_date) {
-               printk(KERN_WARNING "%s used greatest stack depth: %lu bytes "
-                               "left\n",
-                               current->comm, free);
+               printk(KERN_WARNING "%s (%d) used greatest stack depth: "
+                               "%lu bytes left\n",
+                               current->comm, task_pid_nr(current), free);
                lowest_to_date = free;
        }
        spin_unlock(&low_water_lock);