Correct style in arcstat and arc_summary

Fix arcstat and arc_summary so they pass
flake8 python code style checks.

Signed-off-by: Giuseppe Di Natale <dinatale2@llnl.gov>

cmd/arc_summary/arc_summary.py

@@ -66,22 +66,6 @@ def get_Kstat():
             name, unused, value = kstat.split()
             Kstat[namespace + name] = D(value)
 
-    Kstats = [
-        "hw.pagesize",
-        "hw.physmem",
-        "kern.maxusers",
-        "vm.kmem_map_free",
-        "vm.kmem_map_size",
-        "vm.kmem_size",
-        "vm.kmem_size_max",
-        "vm.kmem_size_min",
-        "vm.kmem_size_scale",
-        "vm.stats",
-        "vm.swap_total",
-        "vm.swap_reserved",
-        "kstat.zfs",
-        "vfs.zfs"
-    ]
     Kstat = {}
     load_proc_kstats('/proc/spl/kstat/zfs/arcstats',
                      'kstat.zfs.misc.arcstats.')
@@ -92,6 +76,7 @@ def get_Kstat():
 
     return Kstat
 
+
 def div1():
     sys.stdout.write("\n")
     for i in range(18):
@@ -188,17 +173,17 @@ def get_arc_summary(Kstat):
 
     output['memory_throttle_count'] = fHits(memory_throttle_count)
 
-    ### ARC Misc. ###
+    # ARC Misc.
     deleted = Kstat["kstat.zfs.misc.arcstats.deleted"]
     mutex_miss = Kstat["kstat.zfs.misc.arcstats.mutex_miss"]
 
-    ### ARC Misc. ###
+    # ARC Misc.
     output["arc_misc"] = {}
     output["arc_misc"]["deleted"] = fHits(deleted)
     output["arc_misc"]['mutex_miss'] = fHits(mutex_miss)
     output["arc_misc"]['evict_skips'] = fHits(mutex_miss)
 
-    ### ARC Sizing ###
+    # ARC Sizing
     arc_size = Kstat["kstat.zfs.misc.arcstats.size"]
     mru_size = Kstat["kstat.zfs.misc.arcstats.p"]
     target_max_size = Kstat["kstat.zfs.misc.arcstats.c_max"]
@@ -207,7 +192,7 @@ def get_arc_summary(Kstat):
 
     target_size_ratio = (target_max_size / target_min_size)
 
-    ### ARC Sizing ###
+    # ARC Sizing
     output['arc_sizing'] = {}
     output['arc_sizing']['arc_size'] = {
         'per': fPerc(arc_size, target_max_size),
@@ -226,7 +211,7 @@ def get_arc_summary(Kstat):
         'num': fBytes(target_size),
     }
 
-    ### ARC Hash Breakdown ###
+    # ARC Hash Breakdown
     output['arc_hash_break'] = {}
     output['arc_hash_break']['hash_chain_max'] = Kstat[
         "kstat.zfs.misc.arcstats.hash_chain_max"
@@ -267,7 +252,7 @@ def get_arc_summary(Kstat):
             'num': fBytes(mfu_size),
         }
 
-    ### ARC Hash Breakdown ###
+    # ARC Hash Breakdown
     hash_chain_max = Kstat["kstat.zfs.misc.arcstats.hash_chain_max"]
     hash_chains = Kstat["kstat.zfs.misc.arcstats.hash_chains"]
     hash_collisions = Kstat["kstat.zfs.misc.arcstats.hash_collisions"]
@@ -288,7 +273,7 @@ def get_arc_summary(Kstat):
 
 
 def _arc_summary(Kstat):
-    ### ARC Sizing ###
+    # ARC Sizing
     arc = get_arc_summary(Kstat)
 
     sys.stdout.write("ARC Summary: (%s)\n" % arc['health'])
@@ -297,7 +282,7 @@ def _arc_summary(Kstat):
                      arc['memory_throttle_count'])
     sys.stdout.write("\n")
 
-    ### ARC Misc. ###
+    # ARC Misc.
     sys.stdout.write("ARC Misc:\n")
     sys.stdout.write("\tDeleted:\t\t\t\t%s\n" % arc['arc_misc']['deleted'])
     sys.stdout.write("\tMutex Misses:\t\t\t\t%s\n" %
@@ -306,7 +291,7 @@ def _arc_summary(Kstat):
                      arc['arc_misc']['mutex_miss'])
     sys.stdout.write("\n")
 
-    ### ARC Sizing ###
+    # ARC Sizing
     sys.stdout.write("ARC Size:\t\t\t\t%s\t%s\n" % (
         arc['arc_sizing']['arc_size']['per'],
         arc['arc_sizing']['arc_size']['num']
@@ -344,7 +329,7 @@ def _arc_summary(Kstat):
 
     sys.stdout.write("\n")
 
-    ### ARC Hash Breakdown ###
+    # ARC Hash Breakdown
     sys.stdout.write("ARC Hash Breakdown:\n")
     sys.stdout.write("\tElements Max:\t\t\t\t%s\n" %
                      arc['arc_hash_break']['elements_max'])
@@ -875,7 +860,8 @@ def _tunable_summary(Kstat):
 
     values = {}
     for name in names:
-        with open("/sys/module/zfs/parameters/" + name) as f: value = f.read()
+        with open("/sys/module/zfs/parameters/" + name) as f:
+            value = f.read()
         values[name] = value.strip()
 
     descriptions = {}
@@ -950,13 +936,15 @@ def usage():
     sys.stdout.write("\t -p PAGE, --page=PAGE : "
                      "Select a single output page to display,\n")
     sys.stdout.write("\t                        "
-            "should be an integer between 1 and " + str(len(unSub)) + "\n\n")
+                     "should be an integer between 1 and " +
+                     str(len(unSub)) + "\n\n")
     sys.stdout.write("Examples:\n")
     sys.stdout.write("\tarc_summary.py -a\n")
     sys.stdout.write("\tarc_summary.py -p 4\n")
     sys.stdout.write("\tarc_summary.py -ad\n")
     sys.stdout.write("\tarc_summary.py --page=2\n")
 
+
 def main():
     global show_tunable_descriptions
     global alternate_tunable_layout
@@ -987,7 +975,7 @@ def main():
     if 'p' in args:
         try:
             pages.append(unSub[int(args['p']) - 1])
-        except IndexError as e:
+        except IndexError:
             sys.stderr.write('the argument to -p must be between 1 and ' +
                              str(len(unSub)) + '\n')
             sys.exit()

cmd/arcstat/arcstat.py

@@ -229,15 +229,19 @@ def print_header():
         sys.stdout.write("%*s%s" % (cols[col][0], col, sep))
     sys.stdout.write("\n")
 
+
 def get_terminal_lines():
     try:
-        import fcntl, termios, struct
+        import fcntl
+        import termios
+        import struct
         data = fcntl.ioctl(sys.stdout.fileno(), termios.TIOCGWINSZ, '1234')
         sz = struct.unpack('hh', data)
         return sz[0]
     except:
         pass
 
+
 def update_hdr_intr():
     global hdr_intr
 
@@ -245,6 +249,7 @@ def update_hdr_intr():
     if lines and lines > 3:
         hdr_intr = lines - 3
 
+
 def resize_handler(signum, frame):
     update_hdr_intr()