cmdline: Check if thread names resolved to TIDs

Without this when we ran:

[root@doppio tuna]# tuna -t fire -CP

And there were no 'fire' named threads, all threads would be printed,
now:

[root@doppio tuna]# tuna -t fire -CP
[root@doppio tuna]# tuna -t firefox -CP
                      thread       ctxt_switches
    pid SCHED_ rtpri affinity voluntary nonvoluntary             cmd
 1079    OTHER     0      0,1  10970427      8259378         firefox
  1133   OTHER     0      0,1       847           38         firefox
  1095   OTHER     0      0,1  10436470      2426532         firefox
  23722  OTHER     0      0,1        16            9         firefox
  19341  OTHER     0      0,1     66253         6496         firefox
  1134   OTHER     0      0,1         6            0         firefox
  1135   OTHER     0      0,1     21500         7624         firefox
[root@doppio tuna]#

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/tuna-cmd.py b/tuna-cmd.py
index 11d8481..29fab54 100755
--- a/tuna-cmd.py
+++ b/tuna-cmd.py
@@ -254,6 +254,7 @@ def main():
 	cpu_list = None
 	irq_list = None
 	thread_list = None
+	thread_list_str = None
 	filter = False
 	affect_children = False
 
@@ -273,6 +274,13 @@ def main():
 					 map(thread_mapper, a.split(",")))
 			op_list = list(set(op_list))
 			thread_list = do_list_op(op, thread_list, op_list)
+			# Check if a process name was especified and no
+			# threads was found, which would result in an empty
+			# thread list, i.e. we would print all the threads
+			# in the system when we should print nothing.
+			if not op_list and type(a) == type(''):
+				thread_list_str = do_list_op(op, thread_list_str,
+							     a.split(","))
 			if not op:
 				irq_list = None
 		elif o in ("-f", "--filter"):
@@ -292,6 +300,10 @@ def main():
 		elif o in ("-p", "--priority"):
 			tuna.threads_set_priority(thread_list, a, affect_children)
 		elif o in ("-P", "--show_threads"):
+			# If the user specified process names that weren't
+			# resolved to pids, don't show all threads.
+			if thread_list_str and not thread_list:
+				continue
 			do_ps(thread_list, cpu_list, irq_list, uthreads,
 			      kthreads, affect_children)
 		elif o in ("-m", "--move", "-x", "--spread"):