| #!/usr/bin/python |
| # @lint-avoid-python-3-compatibility-imports |
| # |
| # funccount Count functions, tracepoints, and USDT probes. |
| # For Linux, uses BCC, eBPF. |
| # |
| # USAGE: funccount [-h] [-p PID] [-i INTERVAL] [-T] [-r] pattern |
| # |
| # The pattern is a string with optional '*' wildcards, similar to file |
| # globbing. If you'd prefer to use regular expressions, use the -r option. |
| # |
| # Copyright (c) 2015 Brendan Gregg. |
| # Licensed under the Apache License, Version 2.0 (the "License") |
| # |
| # 09-Sep-2015 Brendan Gregg Created this. |
| # 18-Oct-2016 Sasha Goldshtein Generalized for uprobes, tracepoints, USDT. |
| |
| from __future__ import print_function |
| from bcc import BPF, USDT |
| from time import sleep, strftime |
| import argparse |
| import os |
| import re |
| import signal |
| import sys |
| import traceback |
| |
| debug = False |
| |
| def verify_limit(num): |
| probe_limit = 1000 |
| if num > probe_limit: |
| raise Exception("maximum of %d probes allowed, attempted %d" % |
| (probe_limit, num)) |
| |
| class Probe(object): |
| def __init__(self, pattern, use_regex=False, pid=None): |
| """Init a new probe. |
| |
| Init the probe from the pattern provided by the user. The supported |
| patterns mimic the 'trace' and 'argdist' tools, but are simpler because |
| we don't have to distinguish between probes and retprobes. |
| |
| func -- probe a kernel function |
| lib:func -- probe a user-space function in the library 'lib' |
| p::func -- same thing as 'func' |
| p:lib:func -- same thing as 'lib:func' |
| t:cat:event -- probe a kernel tracepoint |
| u:lib:probe -- probe a USDT tracepoint |
| """ |
| parts = pattern.split(':') |
| if len(parts) == 1: |
| parts = ["p", "", parts[0]] |
| elif len(parts) == 2: |
| parts = ["p", parts[0], parts[1]] |
| elif len(parts) == 3: |
| if parts[0] == "t": |
| parts = ["t", "", "%s:%s" % tuple(parts[1:])] |
| if parts[0] not in ["p", "t", "u"]: |
| raise Exception("Type must be 'p', 't', or 'u', but got %s" % |
| parts[0]) |
| else: |
| raise Exception("Too many ':'-separated components in pattern %s" % |
| pattern) |
| |
| (self.type, self.library, self.pattern) = parts |
| if not use_regex: |
| self.pattern = self.pattern.replace('*', '.*') |
| self.pattern = '^' + self.pattern + '$' |
| |
| if (self.type == "p" and self.library) or self.type == "u": |
| libpath = BPF.find_library(self.library) |
| if libpath is None: |
| # This might be an executable (e.g. 'bash') |
| libpath = BPF.find_exe(self.library) |
| if libpath is None or len(libpath) == 0: |
| raise Exception("unable to find library %s" % self.library) |
| self.library = libpath |
| |
| self.pid = pid |
| self.matched = 0 |
| self.trace_functions = {} # map location number to function name |
| |
| def is_kernel_probe(self): |
| return self.type == "t" or (self.type == "p" and self.library == "") |
| |
| def attach(self): |
| if self.type == "p" and not self.library: |
| for index, function in self.trace_functions.items(): |
| self.bpf.attach_kprobe( |
| event=function, |
| fn_name="trace_count_%d" % index, |
| pid=self.pid or -1) |
| elif self.type == "p" and self.library: |
| for index, function in self.trace_functions.items(): |
| self.bpf.attach_uprobe( |
| name=self.library, |
| sym=function, |
| fn_name="trace_count_%d" % index, |
| pid=self.pid or -1) |
| elif self.type == "t": |
| for index, function in self.trace_functions.items(): |
| self.bpf.attach_tracepoint( |
| tp=function, |
| fn_name="trace_count_%d" % index, |
| pid=self.pid or -1) |
| elif self.type == "u": |
| pass # Nothing to do -- attach already happened in `load` |
| |
| def _add_function(self, template, probe_name): |
| new_func = "trace_count_%d" % self.matched |
| text = template.replace("PROBE_FUNCTION", new_func) |
| text = text.replace("LOCATION", str(self.matched)) |
| self.trace_functions[self.matched] = probe_name |
| self.matched += 1 |
| return text |
| |
| def _generate_functions(self, template): |
| self.usdt = None |
| text = "" |
| if self.type == "p" and not self.library: |
| functions = BPF.get_kprobe_functions(self.pattern) |
| verify_limit(len(functions)) |
| for function in functions: |
| text += self._add_function(template, function) |
| elif self.type == "p" and self.library: |
| # uprobes are tricky because the same function may have multiple |
| # addresses, and the same address may be mapped to multiple |
| # functions. We aren't allowed to create more than one uprobe |
| # per address, so track unique addresses and ignore functions that |
| # map to an address that we've already seen. Also ignore functions |
| # that may repeat multiple times with different addresses. |
| addresses, functions = (set(), set()) |
| functions_and_addresses = BPF.get_user_functions_and_addresses( |
| self.library, self.pattern) |
| verify_limit(len(functions_and_addresses)) |
| for function, address in functions_and_addresses: |
| if address in addresses or function in functions: |
| continue |
| addresses.add(address) |
| functions.add(function) |
| text += self._add_function(template, function) |
| elif self.type == "t": |
| tracepoints = BPF.get_tracepoints(self.pattern) |
| verify_limit(len(tracepoints)) |
| for tracepoint in tracepoints: |
| text += self._add_function(template, tracepoint) |
| elif self.type == "u": |
| self.usdt = USDT(path=self.library, pid=self.pid) |
| matches = [] |
| for probe in self.usdt.enumerate_probes(): |
| if not self.pid and (probe.bin_path != self.library): |
| continue |
| if re.match(self.pattern, probe.name): |
| matches.append(probe.name) |
| verify_limit(len(matches)) |
| for match in matches: |
| new_func = "trace_count_%d" % self.matched |
| text += self._add_function(template, match) |
| self.usdt.enable_probe(match, new_func) |
| if debug: |
| print(self.usdt.get_text()) |
| return text |
| |
| def load(self): |
| trace_count_text = """ |
| int PROBE_FUNCTION(void *ctx) { |
| FILTER |
| int loc = LOCATION; |
| u64 *val = counts.lookup(&loc); |
| if (!val) { |
| return 0; // Should never happen, # of locations is known |
| } |
| (*val)++; |
| return 0; |
| } |
| """ |
| bpf_text = """#include <uapi/linux/ptrace.h> |
| |
| BPF_TABLE("array", int, u64, counts, NUMLOCATIONS); |
| """ |
| |
| # We really mean the tgid from the kernel's perspective, which is in |
| # the top 32 bits of bpf_get_current_pid_tgid(). |
| if self.pid: |
| trace_count_text = trace_count_text.replace('FILTER', |
| """u32 pid = bpf_get_current_pid_tgid() >> 32; |
| if (pid != %d) { return 0; }""" % self.pid) |
| else: |
| trace_count_text = trace_count_text.replace('FILTER', '') |
| |
| bpf_text += self._generate_functions(trace_count_text) |
| bpf_text = bpf_text.replace("NUMLOCATIONS", |
| str(len(self.trace_functions))) |
| if debug: |
| print(bpf_text) |
| |
| if self.matched == 0: |
| raise Exception("No functions matched by pattern %s" % |
| self.pattern) |
| |
| self.bpf = BPF(text=bpf_text, |
| usdt_contexts=[self.usdt] if self.usdt else []) |
| self.clear() # Initialize all array items to zero |
| |
| def counts(self): |
| return self.bpf["counts"] |
| |
| def clear(self): |
| counts = self.bpf["counts"] |
| for location, _ in list(self.trace_functions.items()): |
| counts[counts.Key(location)] = counts.Leaf() |
| |
| class Tool(object): |
| def __init__(self): |
| examples = """examples: |
| ./funccount 'vfs_*' # count kernel fns starting with "vfs" |
| ./funccount -r '^vfs.*' # same as above, using regular expressions |
| ./funccount -Ti 5 'vfs_*' # output every 5 seconds, with timestamps |
| ./funccount -p 185 'vfs_*' # count vfs calls for PID 181 only |
| ./funccount t:sched:sched_fork # count calls to the sched_fork tracepoint |
| ./funccount -p 185 u:node:gc* # count all GC USDT probes in node |
| ./funccount c:malloc # count all malloc() calls in libc |
| """ |
| parser = argparse.ArgumentParser( |
| description="Count functions, tracepoints, and USDT probes", |
| formatter_class=argparse.RawDescriptionHelpFormatter, |
| epilog=examples) |
| parser.add_argument("-p", "--pid", type=int, |
| help="trace this PID only") |
| parser.add_argument("-i", "--interval", default=99999999, |
| help="summary interval, seconds") |
| parser.add_argument("-T", "--timestamp", action="store_true", |
| help="include timestamp on output") |
| parser.add_argument("-r", "--regexp", action="store_true", |
| help="use regular expressions. Default is \"*\" wildcards only.") |
| parser.add_argument("-d", "--debug", action="store_true", |
| help="print BPF program before starting (for debugging purposes)") |
| parser.add_argument("pattern", |
| help="search expression for events") |
| self.args = parser.parse_args() |
| global debug |
| debug = self.args.debug |
| self.probe = Probe(self.args.pattern, self.args.regexp, self.args.pid) |
| |
| @staticmethod |
| def _signal_ignore(signal, frame): |
| print() |
| |
| def run(self): |
| self.probe.load() |
| self.probe.attach() |
| print("Tracing %d functions for \"%s\"... Hit Ctrl-C to end." % |
| (self.probe.matched, self.args.pattern)) |
| exiting = 0 if self.args.interval else 1 |
| while True: |
| try: |
| sleep(int(self.args.interval)) |
| except KeyboardInterrupt: |
| exiting = 1 |
| # as cleanup can take many seconds, trap Ctrl-C: |
| signal.signal(signal.SIGINT, Tool._signal_ignore) |
| |
| print() |
| if self.args.timestamp: |
| print("%-8s\n" % strftime("%H:%M:%S"), end="") |
| |
| print("%-36s %8s" % ("FUNC", "COUNT")) |
| counts = self.probe.counts() |
| for k, v in sorted(counts.items(), |
| key=lambda counts: counts[1].value): |
| if v.value == 0: |
| continue |
| print("%-36s %8d" % |
| (self.probe.trace_functions[k.value], v.value)) |
| |
| if exiting: |
| print("Detaching...") |
| exit() |
| else: |
| self.probe.clear() |
| |
| if __name__ == "__main__": |
| try: |
| Tool().run() |
| except Exception: |
| if debug: |
| traceback.print_exc() |
| elif sys.exc_info()[0] is not SystemExit: |
| print(sys.exc_info()[1]) |