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linux-headers-6.8.0-83
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timerlist.py
# SPDX-License-Identifier: GPL-2.0 # # Copyright 2019 Google LLC. import binascii import gdb from linux import constants from linux import cpus from linux import rbtree from linux import utils timerqueue_node_type = utils.CachedType("struct timerqueue_node").get_type() hrtimer_type = utils.CachedType("struct hrtimer").get_type() def ktime_get(): """Returns the current time, but not very accurately We can't read the hardware timer itself to add any nanoseconds that need to be added since we last stored the time in the timekeeper. But this is probably good enough for debug purposes.""" tk_core = gdb.parse_and_eval("&tk_core") return tk_core['timekeeper']['tkr_mono']['base'] def print_timer(rb_node, idx): timerqueue = utils.container_of(rb_node, timerqueue_node_type.pointer(), "node") timer = utils.container_of(timerqueue, hrtimer_type.pointer(), "node") function = str(timer['function']).split(" ")[1].strip("<>") softexpires = timer['_softexpires'] expires = timer['node']['expires'] now = ktime_get() text = " #{}: <{}>, {}, ".format(idx, timer, function) text += "S:{:02x}\n".format(int(timer['state'])) text += " # expires at {}-{} nsecs [in {} to {} nsecs]\n".format( softexpires, expires, softexpires - now, expires - now) return text def print_active_timers(base): curr = base['active']['rb_root']['rb_leftmost'] idx = 0 while curr: yield print_timer(curr, idx) curr = rbtree.rb_next(curr) idx += 1 def print_base(base): text = " .base: {}\n".format(base.address) text += " .index: {}\n".format(base['index']) text += " .resolution: {} nsecs\n".format(constants.LX_hrtimer_resolution) text += " .get_time: {}\n".format(base['get_time']) if constants.LX_CONFIG_HIGH_RES_TIMERS: text += " .offset: {} nsecs\n".format(base['offset']) text += "active timers:\n" text += "".join([x for x in print_active_timers(base)]) return text def print_cpu(hrtimer_bases, cpu, max_clock_bases): cpu_base = cpus.per_cpu(hrtimer_bases, cpu) jiffies = gdb.parse_and_eval("jiffies_64") tick_sched_ptr = gdb.parse_and_eval("&tick_cpu_sched") ts = cpus.per_cpu(tick_sched_ptr, cpu) text = "cpu: {}\n".format(cpu) for i in range(max_clock_bases): text += " clock {}:\n".format(i) text += print_base(cpu_base['clock_base'][i]) if constants.LX_CONFIG_HIGH_RES_TIMERS: fmts = [(" .{} : {} nsecs", 'expires_next'), (" .{} : {}", 'hres_active'), (" .{} : {}", 'nr_events'), (" .{} : {}", 'nr_retries'), (" .{} : {}", 'nr_hangs'), (" .{} : {}", 'max_hang_time')] text += "\n".join([s.format(f, cpu_base[f]) for s, f in fmts]) text += "\n" if constants.LX_CONFIG_TICK_ONESHOT: fmts = [(" .{} : {}", 'nohz_mode'), (" .{} : {} nsecs", 'last_tick'), (" .{} : {}", 'tick_stopped'), (" .{} : {}", 'idle_jiffies'), (" .{} : {}", 'idle_calls'), (" .{} : {}", 'idle_sleeps'), (" .{} : {} nsecs", 'idle_entrytime'), (" .{} : {} nsecs", 'idle_waketime'), (" .{} : {} nsecs", 'idle_exittime'), (" .{} : {} nsecs", 'idle_sleeptime'), (" .{}: {} nsecs", 'iowait_sleeptime'), (" .{} : {}", 'last_jiffies'), (" .{} : {}", 'next_timer'), (" .{} : {} nsecs", 'idle_expires')] text += "\n".join([s.format(f, ts[f]) for s, f in fmts]) text += "\njiffies: {}\n".format(jiffies) text += "\n" return text def print_tickdevice(td, cpu): dev = td['evtdev'] text = "Tick Device: mode: {}\n".format(td['mode']) if cpu < 0: text += "Broadcast device\n" else: text += "Per CPU device: {}\n".format(cpu) text += "Clock Event Device: " if dev == 0: text += "<NULL>\n" return text text += "{}\n".format(dev['name']) text += " max_delta_ns: {}\n".format(dev['max_delta_ns']) text += " min_delta_ns: {}\n".format(dev['min_delta_ns']) text += " mult: {}\n".format(dev['mult']) text += " shift: {}\n".format(dev['shift']) text += " mode: {}\n".format(dev['state_use_accessors']) text += " next_event: {} nsecs\n".format(dev['next_event']) text += " set_next_event: {}\n".format(dev['set_next_event']) members = [('set_state_shutdown', " shutdown: {}\n"), ('set_state_periodic', " periodic: {}\n"), ('set_state_oneshot', " oneshot: {}\n"), ('set_state_oneshot_stopped', " oneshot stopped: {}\n"), ('tick_resume', " resume: {}\n")] for member, fmt in members: if dev[member]: text += fmt.format(dev[member]) text += " event_handler: {}\n".format(dev['event_handler']) text += " retries: {}\n".format(dev['retries']) return text def pr_cpumask(mask): nr_cpu_ids = 1 if constants.LX_NR_CPUS > 1: nr_cpu_ids = gdb.parse_and_eval("nr_cpu_ids") inf = gdb.inferiors()[0] bits = mask['bits'] num_bytes = (nr_cpu_ids + 7) / 8 buf = utils.read_memoryview(inf, bits, num_bytes).tobytes() buf = binascii.b2a_hex(buf) if type(buf) is not str: buf=buf.decode() chunks = [] i = num_bytes while i > 0: i -= 1 start = i * 2 end = start + 2 chunks.append(buf[start:end]) if i != 0 and i % 4 == 0: chunks.append(',') extra = nr_cpu_ids % 8 if 0 < extra <= 4: chunks[0] = chunks[0][0] # Cut off the first 0 return "".join(str(chunks)) class LxTimerList(gdb.Command): """Print /proc/timer_list""" def __init__(self): super(LxTimerList, self).__init__("lx-timerlist", gdb.COMMAND_DATA) def invoke(self, arg, from_tty): hrtimer_bases = gdb.parse_and_eval("&hrtimer_bases") max_clock_bases = gdb.parse_and_eval("HRTIMER_MAX_CLOCK_BASES") text = "Timer List Version: gdb scripts\n" text += "HRTIMER_MAX_CLOCK_BASES: {}\n".format( max_clock_bases.type.fields()[max_clock_bases].enumval) text += "now at {} nsecs\n".format(ktime_get()) for cpu in cpus.each_online_cpu(): text += print_cpu(hrtimer_bases, cpu, max_clock_bases) if constants.LX_CONFIG_GENERIC_CLOCKEVENTS: if constants.LX_CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: bc_dev = gdb.parse_and_eval("&tick_broadcast_device") text += print_tickdevice(bc_dev, -1) text += "\n" mask = gdb.parse_and_eval("tick_broadcast_mask") mask = pr_cpumask(mask) text += "tick_broadcast_mask: {}\n".format(mask) if constants.LX_CONFIG_TICK_ONESHOT: mask = gdb.parse_and_eval("tick_broadcast_oneshot_mask") mask = pr_cpumask(mask) text += "tick_broadcast_oneshot_mask: {}\n".format(mask) text += "\n" tick_cpu_devices = gdb.parse_and_eval("&tick_cpu_device") for cpu in cpus.each_online_cpu(): tick_dev = cpus.per_cpu(tick_cpu_devices, cpu) text += print_tickdevice(tick_dev, cpu) text += "\n" gdb.write(text) LxTimerList()
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