cpudist: Attempt to resolve pid to command

Use `/proc/$PID/comm`, which may fail, for example if the original process already exited. This may also produce misleading results if another process got the same pid, but there's no way around this.
zilder · Jun 30, 2016 · 4b72f05 · 4b72f05
1 parent 9972f27
commit 4b72f05
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/tools/cpudist.py b/tools/cpudist.py
@@ -192,7 +192,14 @@
     if args.timestamp:
         print("%-8s\n" % strftime("%H:%M:%S"), end="")
 
-    dist.print_log2_hist(label, section, section_print_fn=int)
+    def pid_to_comm(pid):
+        try:
+            comm = open("/proc/%d/comm" % pid, "r").read()
+            return "%d %s" % (pid, comm)
+        except IOError:
+            return str(pid)
+
+    dist.print_log2_hist(label, section, section_print_fn=pid_to_comm)
     dist.clear()
 
     countdown -= 1