Sort output of tunables in arc_summary.py

Sort list of tunables printed by _tunable_summary()
alphabetically

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Giuseppe Di Natale <[email protected]>
Signed-off-by: Scot W. Stevenson <[email protected]>
Closes #6828 

1 files changed, 8 insertions, 4 deletions

diff --git a/cmd/arc_summary/arc_summary.py b/cmd/arc_summary/arc_summary.py
index f4968fb6a..4c513d63d 100755
--- a/cmd/arc_summary/arc_summary.py
+++ b/cmd/arc_summary/arc_summary.py
@@ -900,14 +900,18 @@ def _tunable_summary(Kstat):
             sys.stderr.write("Tunable descriptions will be disabled.\n")
 
     sys.stdout.write("ZFS Tunable:\n")
+    names.sort()
+
+    if alternate_tunable_layout:
+        format = "\t%s=%s\n"
+    else:
+        format = "\t%-50s%s\n"
+
     for name in names:
+
         if not name:
             continue
 
-        format = "\t%-50s%s\n"
-        if alternate_tunable_layout:
-            format = "\t%s=%s\n"
-
         if show_tunable_descriptions and name in descriptions:
             sys.stdout.write("\t# %s\n" % descriptions[name])