Tools lint cleanup (#764)

* argdist: linter cleanup

* cpudist: linter cleanup

* execsnoop: linter cleanup

* funclatency: linter cleanup

* gethostlatency: linter cleanup

* hardirqs: linter cleanup

* memleak: linter cleanup

* mountsnoop: linter cleanup

* offcputime: linter cleanup

* softirqs: linter cleanup

* solisten: linter cleanup and u+x mode

* stacksnoop: linter cleanup

* tplist: linter cleanup

* trace: linter cleanup
diff --git a/tools/argdist.py b/tools/argdist.py
index 2bb44c0..9f41bde 100755
--- a/tools/argdist.py
+++ b/tools/argdist.py
@@ -19,7 +19,7 @@
 
 class Probe(object):
         next_probe_index = 0
-        aliases = { "$PID": "bpf_get_current_pid_tgid()" }
+        aliases = {"$PID": "bpf_get_current_pid_tgid()"}
 
         def _substitute_aliases(self, expr):
                 if expr is None:
@@ -37,8 +37,8 @@
                         # supported right now.
                         index = param.rfind('*')
                         index = index if index != -1 else param.rfind(' ')
-                        param_type = param[0:index+1].strip()
-                        param_name = param[index+1:].strip()
+                        param_type = param[0:index + 1].strip()
+                        param_name = param[index + 1:].strip()
                         self.param_types[param_name] = param_type
 
         def _generate_entry(self):
@@ -65,7 +65,7 @@
                                 collect += """
 u64 __time = bpf_ktime_get_ns();
 %s.update(&pid, &__time);
-"""                             % param_hash
+                        """ % param_hash
                         else:
                                 collect += "%s.update(&pid, &%s);\n" % \
                                            (param_hash, pname)
@@ -88,8 +88,8 @@
                         self.param_types["__latency"] = "u64"    # nanoseconds
                 for pname in self.args_to_probe:
                         if pname not in self.param_types:
-                                raise ValueError("$entry(%s): no such param" \
-                                                % arg)
+                                raise ValueError("$entry(%s): no such param" %
+                                                 arg)
 
                 self.hashname_prefix = "%s_param_" % self.probe_hash_name
                 text = ""
@@ -156,8 +156,8 @@
                 if len(parts) > 6:
                         self._bail("extraneous ':'-separated parts detected")
                 if parts[0] not in ["r", "p", "t", "u"]:
-                        self._bail("probe type must be 'p', 'r', 't', or 'u' " +
-                                   "but got '%s'" % parts[0])
+                        self._bail("probe type must be 'p', 'r', 't', or 'u'" +
+                                   " but got '%s'" % parts[0])
                 if re.match(r"\w+\(.*\)", parts[2]) is None:
                         self._bail(("function signature '%s' has an invalid " +
                                     "format") % parts[2])
@@ -263,8 +263,8 @@
                 expr = self.exprs[i]
                 if self.probe_type == "u" and expr[0:3] == "arg":
                         return ("        u64 %s = 0;\n" +
-                                "        bpf_usdt_readarg(%s, ctx, &%s);\n") % \
-                                (expr, expr[3], expr)
+                                "        bpf_usdt_readarg(%s, ctx, &%s);\n") \
+                                % (expr, expr[3], expr)
                 else:
                         return ""
 
@@ -294,7 +294,7 @@
         def _generate_key_assignment(self):
                 if self.type == "hist":
                         return self._generate_usdt_arg_assignment(0) + \
-                               ("%s __key = %s;\n" % \
+                               ("%s __key = %s;\n" %
                                 (self.expr_types[0], self.exprs[0]))
                 else:
                         text = "struct %s_key_t __key = {};\n" % \
@@ -323,10 +323,11 @@
                 program = ""
                 probe_text = """
 DATA_DECL
-""" + (
-                "TRACEPOINT_PROBE(%s, %s)" % (self.tp_category, self.tp_event) \
-                        if self.probe_type == "t" \
-                        else "int PROBENAME(struct pt_regs *ctx SIGNATURE)") + """
+                """ + (
+                    "TRACEPOINT_PROBE(%s, %s)" %
+                    (self.tp_category, self.tp_event)
+                    if self.probe_type == "t"
+                    else "int PROBENAME(struct pt_regs *ctx SIGNATURE)") + """
 {
         PID_FILTER
         PREFIX
@@ -353,7 +354,8 @@
                         # signatures. Other probes force it to ().
                         signature = ", " + self.signature
 
-                program += probe_text.replace("PROBENAME", self.probe_func_name)
+                program += probe_text.replace("PROBENAME",
+                                              self.probe_func_name)
                 program = program.replace("SIGNATURE", signature)
                 program = program.replace("PID_FILTER",
                                           self._generate_pid_filter())
@@ -400,7 +402,8 @@
 
         def attach(self, bpf):
                 self.bpf = bpf
-                if self.probe_type == "u": return;
+                if self.probe_type == "u":
+                        return
                 if self.is_user:
                         self._attach_u()
                 else:
@@ -447,7 +450,7 @@
                 if self.type == "freq":
                         print(self.label or self.raw_spec)
                         print("\t%-10s %s" % ("COUNT", "EVENT"))
-                        sdata = sorted(data.items(), key=lambda kv: kv[1].value)
+                        sdata = sorted(data.items(), key=lambda p: p[1].value)
                         if top is not None:
                                 sdata = sdata[-top:]
                         for key, value in sdata:
@@ -461,11 +464,11 @@
                                                           self._v2s(key.v0)
                                 else:
                                         key_str = self._display_key(key)
-                                print("\t%-10s %s" % \
+                                print("\t%-10s %s" %
                                       (str(value.value), key_str))
                 elif self.type == "hist":
                         label = self.label or (self._display_expr(0)
-                                if not self.is_default_expr  else "retval")
+                                if not self.is_default_expr else "retval")
                         data.print_log2_hist(val_type=label)
                 if not self.cumulative:
                         data.clear()
@@ -478,8 +481,8 @@
 Probe specifier syntax:
         {p,r,t,u}:{[library],category}:function(signature)[:type[,type...]:expr[,expr...][:filter]][#label]
 Where:
-        p,r,t,u    -- probe at function entry, function exit, kernel tracepoint,
-                      or USDT probe
+        p,r,t,u    -- probe at function entry, function exit, kernel
+                      tracepoint, or USDT probe
                       in exit probes: can use $retval, $entry(param), $latency
         library    -- the library that contains the function
                       (leave empty for kernel functions)
@@ -506,7 +509,7 @@
 argdist -H 'r::__kmalloc(size_t size):u64:$latency/$entry(size)#ns per byte'
         Print a histogram of nanoseconds per byte from kmalloc allocations
 
-argdist -C 'p::__kmalloc(size_t size, gfp_t flags):size_t:size:flags&GFP_ATOMIC'
+argdist -C 'p::__kmalloc(size_t sz, gfp_t flags):size_t:sz:flags&GFP_ATOMIC'
         Print frequency count of kmalloc allocation sizes that have GFP_ATOMIC
 
 argdist -p 1005 -C 'p:c:write(int fd):int:fd' -T 5
@@ -520,7 +523,8 @@
 argdist -C 'r::__vfs_read():u32:$PID:$latency > 100000'
         Print frequency of reads by process where the latency was >0.1ms
 
-argdist -H 'r::__vfs_read(void *file, void *buf, size_t count):size_t:$entry(count):$latency > 1000000'
+argdist -H 'r::__vfs_read(void *file, void *buf, size_t count):size_t
+            $entry(count):$latency > 1000000'
         Print a histogram of read sizes that were longer than 1ms
 
 argdist -H \\
@@ -569,7 +573,8 @@
                 parser.add_argument("-v", "--verbose", action="store_true",
                   help="print resulting BPF program code before executing")
                 parser.add_argument("-c", "--cumulative", action="store_true",
-                  help="do not clear histograms and freq counts at each interval")
+                  help="do not clear histograms and freq counts at " +
+                       "each interval")
                 parser.add_argument("-T", "--top", type=int,
                   help="number of top results to show (not applicable to " +
                   "histograms)")
@@ -610,8 +615,9 @@
                 for probe in self.probes:
                         bpf_source += probe.generate_text()
                 if self.args.verbose:
-                        for text in [probe.usdt_ctx.get_text() \
-                                     for probe in self.probes if probe.usdt_ctx]:
+                        for text in [probe.usdt_ctx.get_text()
+                                     for probe in self.probes
+                                     if probe.usdt_ctx]:
                             print(text)
                         print(bpf_source)
                 usdt_contexts = [probe.usdt_ctx
diff --git a/tools/cpudist.py b/tools/cpudist.py
index 40ccfa0..152596f 100755
--- a/tools/cpudist.py
+++ b/tools/cpudist.py
@@ -183,4 +183,3 @@
     countdown -= 1
     if exiting or countdown == 0:
         exit()
-
diff --git a/tools/execsnoop.py b/tools/execsnoop.py
index 07b73cd..8955c0c 100755
--- a/tools/execsnoop.py
+++ b/tools/execsnoop.py
@@ -88,7 +88,7 @@
     const char __user *const __user *__argv,
     const char __user *const __user *__envp)
 {
-    // create data here and pass to submit_arg to save space on the stack (#555)
+    // create data here and pass to submit_arg to save stack space (#555)
     struct data_t data = {};
     data.pid = bpf_get_current_pid_tgid() >> 32;
     bpf_get_current_comm(&data.comm, sizeof(data.comm));
@@ -167,8 +167,8 @@
 argv = defaultdict(list)
 
 # TODO: This is best-effort PPID matching. Short-lived processes may exit
-# before we get a chance to read the PPID. This should be replaced with fetching
-# PPID via C when available (#364).
+# before we get a chance to read the PPID. This should be replaced with
+# fetching PPID via C when available (#364).
 def get_ppid(pid):
     try:
         with open("/proc/%d/status" % pid) as status:
diff --git a/tools/funclatency.py b/tools/funclatency.py
index 4e6407c..13c18de 100755
--- a/tools/funclatency.py
+++ b/tools/funclatency.py
@@ -9,8 +9,8 @@
 #
 # Run "funclatency -h" for full usage.
 #
-# The pattern is a string with optional '*' wildcards, similar to file globbing.
-# If you'd prefer to use regular expressions, use the -r option.
+# The pattern is a string with optional '*' wildcards, similar to file
+# globbing. If you'd prefer to use regular expressions, use the -r option.
 #
 # Currently nested or recursive functions are not supported properly, and
 # timestamps will be overwritten, creating dubious output. Try to match single
@@ -202,7 +202,8 @@
     matched = b.num_open_kprobes()
 else:
     b.attach_uprobe(name=library, sym_re=pattern, fn_name="trace_func_entry")
-    b.attach_uretprobe(name=library, sym_re=pattern, fn_name="trace_func_return")
+    b.attach_uretprobe(name=library, sym_re=pattern,
+                       fn_name="trace_func_return")
     matched = b.num_open_uprobes()
 
 if matched == 0:
diff --git a/tools/gethostlatency.py b/tools/gethostlatency.py
index 38120c6..73e4ad2 100755
--- a/tools/gethostlatency.py
+++ b/tools/gethostlatency.py
@@ -51,7 +51,8 @@
     u32 pid = bpf_get_current_pid_tgid();
 
     if (bpf_get_current_comm(&val.comm, sizeof(val.comm)) == 0) {
-        bpf_probe_read(&val.host, sizeof(val.host), (void *)PT_REGS_PARM1(ctx));
+        bpf_probe_read(&val.host, sizeof(val.host),
+                       (void *)PT_REGS_PARM1(ctx));
         val.pid = bpf_get_current_pid_tgid();
         val.ts = bpf_ktime_get_ns();
         start.update(&pid, &val);
diff --git a/tools/hardirqs.py b/tools/hardirqs.py
index 05a8871..36549c7 100755
--- a/tools/hardirqs.py
+++ b/tools/hardirqs.py
@@ -18,7 +18,7 @@
 from time import sleep, strftime
 import argparse
 
-### arguments
+# arguments
 examples = """examples:
     ./hardirqs            # sum hard irq event time
     ./hardirqs -d         # show hard irq event time as histograms
@@ -49,7 +49,7 @@
     label = "usecs"
 debug = 0
 
-### define BPF program
+# define BPF program
 bpf_text = """
 #include <uapi/linux/ptrace.h>
 #include <linux/irq.h>
@@ -106,7 +106,7 @@
 }
 """
 
-### code substitutions
+# code substitutions
 if args.dist:
     bpf_text = bpf_text.replace('STORE',
         'irq_key_t key = {.slot = bpf_log2l(delta)};' +
@@ -121,7 +121,7 @@
 if debug:
     print(bpf_text)
 
-### load BPF program
+# load BPF program
 b = BPF(text=bpf_text)
 
 # these should really use irq:irq_handler_entry/exit tracepoints:
@@ -130,7 +130,7 @@
 
 print("Tracing hard irq event time... Hit Ctrl-C to end.")
 
-### output
+# output
 exiting = 0 if args.interval else 1
 dist = b.get_table("dist")
 while (1):
diff --git a/tools/memleak.py b/tools/memleak.py
index e8bf06f..04f0fea 100755
--- a/tools/memleak.py
+++ b/tools/memleak.py
@@ -280,11 +280,13 @@
                         alloc_info[info.stack_id].update(info.size)
                 else:
                         stack = list(stack_traces.walk(info.stack_id, decoder))
-                        alloc_info[info.stack_id] = Allocation(stack, info.size)
+                        alloc_info[info.stack_id] = Allocation(stack,
+                                                               info.size)
                 if args.show_allocs:
                         print("\taddr = %x size = %s" %
                               (address.value, info.size))
-        to_show = sorted(alloc_info.values(), key=lambda a: a.size)[-top_stacks:]
+        to_show = sorted(alloc_info.values(),
+                         key=lambda a: a.size)[-top_stacks:]
         for alloc in to_show:
                 print("\t%d bytes in %d allocations from stack\n\t\t%s" %
                       (alloc.size, alloc.count, "\n\t\t".join(alloc.stack)))
diff --git a/tools/mountsnoop.py b/tools/mountsnoop.py
index dfaafc3..a7a3973 100755
--- a/tools/mountsnoop.py
+++ b/tools/mountsnoop.py
@@ -369,7 +369,8 @@
               event.type == EventType.EVENT_UMOUNT_RET):
             if event.type == EventType.EVENT_MOUNT_RET:
                 syscall = mounts.pop(event.pid)
-                call = 'mount({source}, {target}, {type}, {flags}, {data}) = {retval}'.format(
+                call = ('mount({source}, {target}, {type}, {flags}, {data}) ' +
+                        '= {retval}').format(
                     source=decode_mount_string(syscall['source']),
                     target=decode_mount_string(syscall['target']),
                     type=decode_mount_string(syscall['type']),
diff --git a/tools/offcputime.py b/tools/offcputime.py
index 95da546..1bab38b 100755
--- a/tools/offcputime.py
+++ b/tools/offcputime.py
@@ -40,8 +40,8 @@
     ./offcputime             # trace off-CPU stack time until Ctrl-C
     ./offcputime 5           # trace for 5 seconds only
     ./offcputime -f 5        # 5 seconds, and output in folded format
-    ./offcputime -m 1000     # trace only events that last more than 1000 usec.
-    ./offcputime -M 10000    # trace only events that last less than 10000 usec.
+    ./offcputime -m 1000     # trace only events that last more than 1000 usec
+    ./offcputime -M 10000    # trace only events that last less than 10000 usec
     ./offcputime -p 185      # only trace threads for PID 185
     ./offcputime -t 188      # only trace thread 188
     ./offcputime -u          # only trace user threads (no kernel)
@@ -82,10 +82,12 @@
     help="duration of trace, in seconds")
 parser.add_argument("-m", "--min-block-time", default=1,
     type=positive_nonzero_int,
-    help="the amount of time in microseconds over which we store traces (default 1)")
-parser.add_argument("-M", "--max-block-time", default=(1<<64)-1,
+    help="the amount of time in microseconds over which we " +
+         "store traces (default 1)")
+parser.add_argument("-M", "--max-block-time", default=(1 << 64) - 1,
     type=positive_nonzero_int,
-    help="the amount of time in microseconds under which we store traces (default U64_MAX)")
+    help="the amount of time in microseconds under which we " +
+         "store traces (default U64_MAX)")
 args = parser.parse_args()
 if args.pid and args.tgid:
     parser.error("specify only one of -p and -t")
@@ -198,13 +200,14 @@
 bpf_text = bpf_text.replace('USER_STACK_GET', user_stack_get)
 bpf_text = bpf_text.replace('KERNEL_STACK_GET', kernel_stack_get)
 
-need_delimiter = args.delimited and not (args.kernel_stacks_only or args.user_stacks_only)
+need_delimiter = args.delimited and not (args.kernel_stacks_only or
+                                         args.user_stacks_only)
 
 # check for an edge case; the code below will handle this case correctly
 # but ultimately nothing will be displayed
 if args.kernel_threads_only and args.user_stacks_only:
-    print("ERROR: Displaying user stacks for kernel threads " \
-        "doesn't make sense.", file=stderr)
+    print("ERROR: Displaying user stacks for kernel threads " +
+          "doesn't make sense.", file=stderr)
     exit(1)
 
 # initialize BPF
@@ -240,8 +243,8 @@
 for k, v in sorted(counts.items(), key=lambda counts: counts[1].value):
     # handle get_stackid erorrs
     if (not args.user_stacks_only and k.kernel_stack_id < 0) or \
-            (not args.kernel_stacks_only and k.user_stack_id < 0 and \
-                k.user_stack_id != -errno.EFAULT):
+            (not args.kernel_stacks_only and k.user_stack_id < 0 and
+                 k.user_stack_id != -errno.EFAULT):
         missing_stacks += 1
         # check for an ENOMEM error
         if k.kernel_stack_id == -errno.ENOMEM or \
diff --git a/tools/softirqs.py b/tools/softirqs.py
index dd24231..0b2e50c 100755
--- a/tools/softirqs.py
+++ b/tools/softirqs.py
@@ -16,7 +16,7 @@
 from time import sleep, strftime
 import argparse
 
-### arguments
+# arguments
 examples = """examples:
     ./softirqs            # sum soft irq event time
     ./softirqs -d         # show soft irq event time as histograms
@@ -47,7 +47,7 @@
     label = "usecs"
 debug = 0
 
-### define BPF program
+# define BPF program
 bpf_text = """
 #include <uapi/linux/ptrace.h>
 
@@ -92,7 +92,7 @@
 }
 """
 
-### code substitutions
+# code substitutions
 if args.dist:
     bpf_text = bpf_text.replace('STORE',
         'irq_key_t key = {.ip = ip, .slot = bpf_log2l(delta)};' +
@@ -105,22 +105,22 @@
 if debug:
     print(bpf_text)
 
-### load BPF program
+# load BPF program
 b = BPF(text=bpf_text)
 
 # this should really use irq:softirq_entry/exit tracepoints; for now the
 # soft irq functions are individually traced (search your kernel for
 # open_softirq() calls, and adjust the following list as needed).
 for softirqfunc in ("blk_iopoll_softirq", "blk_done_softirq",
-    "rcu_process_callbacks", "run_rebalance_domains", "tasklet_action",
-    "tasklet_hi_action", "run_timer_softirq", "net_tx_action",
-    "net_rx_action"):
+        "rcu_process_callbacks", "run_rebalance_domains", "tasklet_action",
+        "tasklet_hi_action", "run_timer_softirq", "net_tx_action",
+        "net_rx_action"):
     b.attach_kprobe(event=softirqfunc, fn_name="trace_start")
     b.attach_kretprobe(event=softirqfunc, fn_name="trace_completion")
 
 print("Tracing soft irq event time... Hit Ctrl-C to end.")
 
-### output
+# output
 exiting = 0 if args.interval else 1
 dist = b.get_table("dist")
 while (1):
diff --git a/tools/solisten.py b/tools/solisten.py
old mode 100644
new mode 100755
index 9797672..1192654
--- a/tools/solisten.py
+++ b/tools/solisten.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 #
-# solisten	Trace TCP listen events
-#		For Linux, uses BCC, eBPF. Embedded C.
+# solisten      Trace TCP listen events
+#               For Linux, uses BCC, eBPF. Embedded C.
 #
 # USAGE: solisten.py [-h] [-p PID] [--show-netns]
 #
@@ -28,8 +28,8 @@
 examples = """Examples:
     ./solisten.py              # Stream socket listen
     ./solisten.py -p 1234      # Stream socket listen for specified PID only
-    ./solisten.py --netns 4242 # Stream socket listen for specified network namespace ID only
-    ./solisten.py --show-netns # Show network namespace ID. Probably usefull if you run containers
+    ./solisten.py --netns 4242 # " for the specified network namespace ID only
+    ./solisten.py --show-netns # Show network ns ID (useful for containers)
 """
 
 parser = argparse.ArgumentParser(
@@ -45,7 +45,7 @@
 
 
 # BPF Program
-bpf_text = """ 
+bpf_text = """
 #include <net/sock.h>
 #include <net/inet_sock.h>
 #include <net/net_namespace.h>
@@ -77,7 +77,8 @@
             .backlog = backlog,
         };
 
-        // Get process comm. Needs LLVM >= 3.7.1 see https://github.com/iovisor/bcc/issues/393
+        // Get process comm. Needs LLVM >= 3.7.1
+        // see https://github.com/iovisor/bcc/issues/393
         bpf_get_current_comm(evt.task, TASK_COMM_LEN);
 
         // Get socket IP family
@@ -107,7 +108,8 @@
             bpf_probe_read(evt.laddr, sizeof(u32), &(inet->inet_rcv_saddr));
             evt.laddr[0] = be32_to_cpu(evt.laddr[0]);
         } else if (family == AF_INET6) {
-            bpf_probe_read(evt.laddr, sizeof(evt.laddr), sk->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32);
+            bpf_probe_read(evt.laddr, sizeof(evt.laddr),
+                           sk->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32);
             evt.laddr[0] = be64_to_cpu(evt.laddr[0]);
             evt.laddr[1] = be64_to_cpu(evt.laddr[1]);
         }
@@ -157,7 +159,8 @@
             protocol += "v4"
             address = netaddr.IPAddress(event.laddr[0])
         elif proto_type == socket.AF_INET6:
-            address = netaddr.IPAddress(event.laddr[0]<<64 | event.laddr[1], version=6)
+            address = netaddr.IPAddress(event.laddr[0] << 64 | event.laddr[1],
+                                        version=6)
             protocol += "v6"
 
         # Display
@@ -195,11 +198,12 @@
 
     # Print headers
     if args.show_netns:
-        print("%-6s %-12s %-12s %-6s %-8s %-5s %-39s" % ("PID", "COMM", "NETNS", "PROTO", "BACKLOG", "PORT", "ADDR"))
+        print("%-6s %-12s %-12s %-6s %-8s %-5s %-39s" %
+              ("PID", "COMM", "NETNS", "PROTO", "BACKLOG", "PORT", "ADDR"))
     else:
-        print("%-6s %-12s %-6s %-8s %-5s %-39s" % ("PID", "COMM", "PROTO", "BACKLOG", "PORT", "ADDR"))
+        print("%-6s %-12s %-6s %-8s %-5s %-39s" %
+              ("PID", "COMM", "PROTO", "BACKLOG", "PORT", "ADDR"))
 
     # Read events
     while 1:
         b.kprobe_poll()
-
diff --git a/tools/stacksnoop.py b/tools/stacksnoop.py
index 421ce1b..1eefc0a 100755
--- a/tools/stacksnoop.py
+++ b/tools/stacksnoop.py
@@ -114,8 +114,8 @@
     ts = time.time() - start_ts
 
     if verbose:
-        print("%-18.9f %-12.12s %-6d %-3d %s" % (ts, event.comm, event.pid, cpu,
-                function))
+        print("%-18.9f %-12.12s %-6d %-3d %s" %
+              (ts, event.comm, event.pid, cpu, function))
     else:
         print("%-18.9f %s" % (ts, function))
 
diff --git a/tools/tplist.py b/tools/tplist.py
index c063b00..627f20e 100755
--- a/tools/tplist.py
+++ b/tools/tplist.py
@@ -18,22 +18,23 @@
 trace_root = "/sys/kernel/debug/tracing"
 event_root = os.path.join(trace_root, "events")
 
-parser = argparse.ArgumentParser(description=
-                "Display kernel tracepoints or USDT probes and their formats.",
-                formatter_class=argparse.RawDescriptionHelpFormatter)
-parser.add_argument("-p", "--pid", type=int, default=None, help=
-                "List USDT probes in the specified process")
-parser.add_argument("-l", "--lib", default="", help=
-                "List USDT probes in the specified library or executable")
-parser.add_argument("-v", dest="verbosity", action="count", help=
-                "Increase verbosity level (print variables, arguments, etc.)")
-parser.add_argument(dest="filter", nargs="?", help=
-                "A filter that specifies which probes/tracepoints to print")
+parser = argparse.ArgumentParser(
+        description="Display kernel tracepoints or USDT probes " +
+                    "and their formats.",
+        formatter_class=argparse.RawDescriptionHelpFormatter)
+parser.add_argument("-p", "--pid", type=int, default=None,
+        help="List USDT probes in the specified process")
+parser.add_argument("-l", "--lib", default="",
+        help="List USDT probes in the specified library or executable")
+parser.add_argument("-v", dest="verbosity", action="count",
+        help="Increase verbosity level (print variables, arguments, etc.)")
+parser.add_argument(dest="filter", nargs="?",
+        help="A filter that specifies which probes/tracepoints to print")
 args = parser.parse_args()
 
 def print_tpoint_format(category, event):
-        fmt = open(os.path.join(event_root, category, event, "format")
-                  ).readlines()
+        fmt = open(os.path.join(event_root, category, event, "format")) \
+              .readlines()
         for line in fmt:
                 match = re.search(r'field:([^;]*);', line)
                 if match is None:
@@ -81,7 +82,8 @@
                         print("  %d location(s)" % probe.num_locations)
                         print("  %d argument(s)" % probe.num_arguments)
         else:
-                print("%s %s:%s" % (probe.bin_path, probe.provider, probe.name))
+                print("%s %s:%s" %
+                      (probe.bin_path, probe.provider, probe.name))
 
 def print_usdt(pid, lib):
         reader = USDT(path=lib, pid=pid)
@@ -103,4 +105,3 @@
         except:
                 if sys.exc_info()[0] is not SystemExit:
                         print(sys.exc_info()[1])
-
diff --git a/tools/trace.py b/tools/trace.py
index d6aef8d..d1169d3 100755
--- a/tools/trace.py
+++ b/tools/trace.py
@@ -106,8 +106,8 @@
                                 if text[i] == ")":
                                         balance -= 1
                                 if balance == 0:
-                                        self._parse_filter(text[:i+1])
-                                        text = text[i+1:]
+                                        self._parse_filter(text[:i + 1])
+                                        text = text[i + 1:]
                                         break
                         if self.filter is None:
                                 self._bail("unmatched end of predicate")
@@ -139,7 +139,7 @@
                         self.tp_category = parts[1]
                         self.tp_event = parts[2]
                         self.library = ""       # kernel
-                        self.function = ""      # generated from TRACEPOINT_PROBE
+                        self.function = ""      # from TRACEPOINT_PROBE
                 elif self.probe_type == "u":
                         self.library = parts[1]
                         self.usdt_name = parts[2]
@@ -155,7 +155,7 @@
                 self.usdt = USDT(path=self.library, pid=Probe.pid)
                 for probe in self.usdt.enumerate_probes():
                         if probe.name == self.usdt_name:
-                                return # Found it, will enable later
+                                return  # Found it, will enable later
                 self._bail("unrecognized USDT probe %s" % self.usdt_name)
 
         def _parse_filter(self, filt):
@@ -163,7 +163,7 @@
 
         def _parse_types(self, fmt):
                 for match in re.finditer(
-                                r'[^%]%(s|u|d|llu|lld|hu|hd|x|llx|c|K|U)', fmt):
+                            r'[^%]%(s|u|d|llu|lld|hu|hd|x|llx|c|K|U)', fmt):
                         self.types.append(match.group(1))
                 fmt = re.sub(r'([^%]%)(u|d|llu|lld|hu|hd)', r'\1d', fmt)
                 fmt = re.sub(r'([^%]%)(x|llx)', r'\1x', fmt)
@@ -207,18 +207,18 @@
         def _replace_args(self, expr):
                 for alias, replacement in Probe.aliases.items():
                         # For USDT probes, we replace argN values with the
-                        # actual arguments for that probe obtained using special
+                        # actual arguments for that probe obtained using
                         # bpf_readarg_N macros emitted at BPF construction.
                         if alias.startswith("arg") and self.probe_type == "u":
                                 continue
                         expr = expr.replace(alias, replacement)
                 return expr
 
-        p_type = { "u": ct.c_uint, "d": ct.c_int,
-                   "llu": ct.c_ulonglong, "lld": ct.c_longlong,
-                   "hu": ct.c_ushort, "hd": ct.c_short,
-                   "x": ct.c_uint, "llx": ct.c_ulonglong, "c": ct.c_ubyte,
-                   "K": ct.c_ulonglong, "U": ct.c_ulonglong }
+        p_type = {"u": ct.c_uint, "d": ct.c_int,
+                  "llu": ct.c_ulonglong, "lld": ct.c_longlong,
+                  "hu": ct.c_ushort, "hd": ct.c_short,
+                  "x": ct.c_uint, "llx": ct.c_ulonglong, "c": ct.c_ubyte,
+                  "K": ct.c_ulonglong, "U": ct.c_ulonglong}
 
         def _generate_python_field_decl(self, idx, fields):
                 field_type = self.types[idx]
@@ -245,12 +245,12 @@
                 return type(self.python_struct_name, (ct.Structure,),
                             dict(_fields_=fields))
 
-        c_type = { "u": "unsigned int", "d": "int",
-                   "llu": "unsigned long long", "lld": "long long",
-                   "hu": "unsigned short", "hd": "short",
-                   "x": "unsigned int", "llx": "unsigned long long",
-                   "c": "char", "K": "unsigned long long",
-                   "U": "unsigned long long" }
+        c_type = {"u": "unsigned int", "d": "int",
+                  "llu": "unsigned long long", "lld": "long long",
+                  "hu": "unsigned short", "hd": "short",
+                  "x": "unsigned int", "llx": "unsigned long long",
+                  "c": "char", "K": "unsigned long long",
+                  "U": "unsigned long long"}
         fmt_types = c_type.keys()
 
         def _generate_field_decl(self, idx):
@@ -304,15 +304,15 @@
                 text = ""
                 if self.probe_type == "u" and expr[0:3] == "arg":
                         text = ("        u64 %s = 0;\n" +
-                                "        bpf_usdt_readarg(%s, ctx, &%s);\n") % \
-                                (expr, expr[3], expr)
+                                "        bpf_usdt_readarg(%s, ctx, &%s);\n") \
+                                % (expr, expr[3], expr)
 
                 if field_type == "s":
                         return text + """
         if (%s != 0) {
                 bpf_probe_read(&__data.v%d, sizeof(__data.v%d), (void *)%s);
         }
-"""                     % (expr, idx, idx, expr)
+                """ % (expr, idx, idx, expr)
                 if field_type in Probe.fmt_types:
                         return text + "        __data.v%d = (%s)%s;\n" % \
                                         (idx, Probe.c_type[field_type], expr)
@@ -322,7 +322,8 @@
             text = ""
             if self.probe_type == "u":
                     for arg, _ in Probe.aliases.items():
-                        if not (arg.startswith("arg") and (arg in self.filter)):
+                        if not (arg.startswith("arg") and
+                                (arg in self.filter)):
                                 continue
                         arg_index = int(arg.replace("arg", ""))
                         arg_ctype = self.usdt.get_probe_arg_ctype(
@@ -346,12 +347,12 @@
                         pid_filter = """
         u32 __pid = bpf_get_current_pid_tgid();
         if (__pid != %d) { return 0; }
-"""             % Probe.pid
+                """ % Probe.pid
                 elif not include_self:
                         pid_filter = """
         u32 __pid = bpf_get_current_pid_tgid();
         if (__pid == %d) { return 0; }
-"""             % os.getpid()
+                """ % os.getpid()
                 else:
                         pid_filter = ""
 
@@ -431,8 +432,8 @@
                 # Replace each %K with kernel sym and %U with user sym in pid
                 kernel_placeholders = [i for i in xrange(0, len(self.types))
                                        if self.types[i] == 'K']
-                user_placeholders   = [i for i in xrange(0, len(self.types))
-                                       if self.types[i] == 'U']
+                user_placeholders = [i for i in xrange(0, len(self.types))
+                                     if self.types[i] == 'U']
                 for kp in kernel_placeholders:
                         values[kp] = bpf.ksymaddr(values[kp])
                 for up in user_placeholders:
@@ -448,7 +449,7 @@
                 msg = self._format_message(bpf, event.pid, values)
                 time = strftime("%H:%M:%S") if Probe.use_localtime else \
                        Probe._time_off_str(event.timestamp_ns)
-                print("%-8s %-6d %-12s %-16s %s" % \
+                print("%-8s %-6d %-12s %-16s %s" %
                     (time[:8], event.pid, event.comm[:12],
                      self._display_function(), msg))
 
@@ -493,7 +494,7 @@
                         self._bail("unable to find library %s" % self.library)
 
                 if self.probe_type == "u":
-                        pass # Was already enabled by the BPF constructor
+                        pass    # Was already enabled by the BPF constructor
                 elif self.probe_type == "r":
                         bpf.attach_uretprobe(name=libpath,
                                              sym=self.function,
@@ -534,26 +535,27 @@
 """
 
         def __init__(self):
-                parser = argparse.ArgumentParser(description=
-                        "Attach to functions and print trace messages.",
-                        formatter_class=argparse.RawDescriptionHelpFormatter,
-                        epilog=Tool.examples)
+                parser = argparse.ArgumentParser(description="Attach to " +
+                  "functions and print trace messages.",
+                  formatter_class=argparse.RawDescriptionHelpFormatter,
+                  epilog=Tool.examples)
                 parser.add_argument("-p", "--pid", type=int,
                   help="id of the process to trace (optional)")
                 parser.add_argument("-v", "--verbose", action="store_true",
                   help="print resulting BPF program code before executing")
                 parser.add_argument("-Z", "--string-size", type=int,
                   default=80, help="maximum size to read from strings")
-                parser.add_argument("-S", "--include-self", action="store_true",
+                parser.add_argument("-S", "--include-self",
+                  action="store_true",
                   help="do not filter trace's own pid from the trace")
                 parser.add_argument("-M", "--max-events", type=int,
                   help="number of events to print before quitting")
                 parser.add_argument("-o", "--offset", action="store_true",
                   help="use relative time from first traced message")
-                parser.add_argument("-K", "--kernel-stack", action="store_true",
-                  help="output kernel stack trace")
-                parser.add_argument("-U", "--user-stack", action="store_true",
-                  help="output user stack trace")
+                parser.add_argument("-K", "--kernel-stack",
+                  action="store_true", help="output kernel stack trace")
+                parser.add_argument("-U", "--user-stack",
+                  action="store_true", help="output user stack trace")
                 parser.add_argument(metavar="probe", dest="probes", nargs="+",
                   help="probe specifier (see examples)")
                 parser.add_argument("-I", "--include", action="append",
@@ -609,7 +611,7 @@
                                              self.probes))
 
                 # Print header
-                print("%-8s %-6s %-12s %-16s %s" % \
+                print("%-8s %-6s %-12s %-16s %s" %
                       ("TIME", "PID", "COMM", "FUNC",
                       "-" if not all_probes_trivial else ""))
 
@@ -629,4 +631,4 @@
                                 print(sys.exc_info()[1])
 
 if __name__ == "__main__":
-       Tool().run()
+        Tool().run()