scripts/gdb: add a timer list command
Implement a command to print the timer list, much like how /proc/timer_list is implemented. This can be used to look at the pending timers on a crashed system. [swboyd@chromium.org: v2] Link: http://lkml.kernel.org/r/20190329220844.38234-5-swboyd@chromium.org Link: http://lkml.kernel.org/r/20190325184522.260535-5-swboyd@chromium.org Signed-off-by: Stephen Boyd <swboyd@chromium.org> Cc: Douglas Anderson <dianders@chromium.org> Cc: Nikolay Borisov <n.borisov.lkml@gmail.com> Cc: Kieran Bingham <kbingham@kernel.org> Cc: Jan Kiszka <jan.kiszka@siemens.com> Cc: Jackie Liu <liuyun01@kylinos.cn> Cc: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stephen Boyd
Linus Torvalds
parent
449ca0c95e
commit
442284a89a
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@ -13,8 +13,10 @@
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*/
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#include <linux/fs.h>
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#include <linux/hrtimer.h>
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#include <linux/mount.h>
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#include <linux/of_fdt.h>
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#include <linux/threads.h>
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/* We need to stringify expanded macros so that they can be parsed */
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@ -44,6 +46,9 @@ LX_VALUE(SB_DIRSYNC)
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LX_VALUE(SB_NOATIME)
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LX_VALUE(SB_NODIRATIME)
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/* linux/htimer.h */
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LX_GDBPARSED(hrtimer_resolution)
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/* linux/mount.h */
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LX_VALUE(MNT_NOSUID)
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LX_VALUE(MNT_NODEV)
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@ -52,8 +57,16 @@ LX_VALUE(MNT_NOATIME)
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LX_VALUE(MNT_NODIRATIME)
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LX_VALUE(MNT_RELATIME)
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/* linux/threads.h */
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LX_VALUE(NR_CPUS)
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/* linux/of_fdt.h> */
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LX_VALUE(OF_DT_HEADER)
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/* Kernel Configs */
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LX_CONFIG(CONFIG_GENERIC_CLOCKEVENTS)
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LX_CONFIG(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST)
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LX_CONFIG(CONFIG_HIGH_RES_TIMERS)
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LX_CONFIG(CONFIG_NR_CPUS)
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LX_CONFIG(CONFIG_OF)
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LX_CONFIG(CONFIG_TICK_ONESHOT)
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@ -0,0 +1,219 @@
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# SPDX-License-Identifier: GPL-2.0
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#
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# Copyright 2019 Google LLC.
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import binascii
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import gdb
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from linux import constants
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from linux import cpus
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from linux import rbtree
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from linux import utils
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timerqueue_node_type = utils.CachedType("struct timerqueue_node").get_type()
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hrtimer_type = utils.CachedType("struct hrtimer").get_type()
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def ktime_get():
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"""Returns the current time, but not very accurately
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We can't read the hardware timer itself to add any nanoseconds
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that need to be added since we last stored the time in the
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timekeeper. But this is probably good enough for debug purposes."""
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tk_core = gdb.parse_and_eval("&tk_core")
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return tk_core['timekeeper']['tkr_mono']['base']
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def print_timer(rb_node, idx):
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timerqueue = utils.container_of(rb_node, timerqueue_node_type.pointer(),
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"node")
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timer = utils.container_of(timerqueue, hrtimer_type.pointer(), "node")
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function = str(timer['function']).split(" ")[1].strip("<>")
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softexpires = timer['_softexpires']
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expires = timer['node']['expires']
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now = ktime_get()
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text = " #{}: <{}>, {}, ".format(idx, timer, function)
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text += "S:{:02x}\n".format(int(timer['state']))
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text += " # expires at {}-{} nsecs [in {} to {} nsecs]\n".format(
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softexpires, expires, softexpires - now, expires - now)
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return text
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def print_active_timers(base):
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curr = base['active']['next']['node']
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curr = curr.address.cast(rbtree.rb_node_type.get_type().pointer())
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idx = 0
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while curr:
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yield print_timer(curr, idx)
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curr = rbtree.rb_next(curr)
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idx += 1
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def print_base(base):
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text = " .base: {}\n".format(base.address)
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text += " .index: {}\n".format(base['index'])
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text += " .resolution: {} nsecs\n".format(constants.LX_hrtimer_resolution)
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text += " .get_time: {}\n".format(base['get_time'])
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if constants.LX_CONFIG_HIGH_RES_TIMERS:
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text += " .offset: {} nsecs\n".format(base['offset'])
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text += "active timers:\n"
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text += "".join([x for x in print_active_timers(base)])
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return text
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def print_cpu(hrtimer_bases, cpu, max_clock_bases):
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cpu_base = cpus.per_cpu(hrtimer_bases, cpu)
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jiffies = gdb.parse_and_eval("jiffies_64")
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tick_sched_ptr = gdb.parse_and_eval("&tick_cpu_sched")
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ts = cpus.per_cpu(tick_sched_ptr, cpu)
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text = "cpu: {}\n".format(cpu)
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for i in xrange(max_clock_bases):
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text += " clock {}:\n".format(i)
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text += print_base(cpu_base['clock_base'][i])
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if constants.LX_CONFIG_HIGH_RES_TIMERS:
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fmts = [(" .{} : {} nsecs", 'expires_next'),
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(" .{} : {}", 'hres_active'),
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(" .{} : {}", 'nr_events'),
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(" .{} : {}", 'nr_retries'),
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(" .{} : {}", 'nr_hangs'),
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(" .{} : {}", 'max_hang_time')]
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text += "\n".join([s.format(f, cpu_base[f]) for s, f in fmts])
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text += "\n"
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if constants.LX_CONFIG_TICK_ONESHOT:
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fmts = [(" .{} : {}", 'nohz_mode'),
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(" .{} : {} nsecs", 'last_tick'),
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(" .{} : {}", 'tick_stopped'),
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(" .{} : {}", 'idle_jiffies'),
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(" .{} : {}", 'idle_calls'),
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(" .{} : {}", 'idle_sleeps'),
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(" .{} : {} nsecs", 'idle_entrytime'),
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(" .{} : {} nsecs", 'idle_waketime'),
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(" .{} : {} nsecs", 'idle_exittime'),
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(" .{} : {} nsecs", 'idle_sleeptime'),
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(" .{}: {} nsecs", 'iowait_sleeptime'),
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(" .{} : {}", 'last_jiffies'),
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(" .{} : {}", 'next_timer'),
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(" .{} : {} nsecs", 'idle_expires')]
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text += "\n".join([s.format(f, ts[f]) for s, f in fmts])
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text += "\njiffies: {}\n".format(jiffies)
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text += "\n"
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return text
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def print_tickdevice(td, cpu):
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dev = td['evtdev']
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text = "Tick Device: mode: {}\n".format(td['mode'])
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if cpu < 0:
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text += "Broadcast device\n"
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else:
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text += "Per CPU device: {}\n".format(cpu)
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text += "Clock Event Device: "
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if dev == 0:
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text += "<NULL>\n"
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return text
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text += "{}\n".format(dev['name'])
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text += " max_delta_ns: {}\n".format(dev['max_delta_ns'])
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text += " min_delta_ns: {}\n".format(dev['min_delta_ns'])
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text += " mult: {}\n".format(dev['mult'])
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text += " shift: {}\n".format(dev['shift'])
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text += " mode: {}\n".format(dev['state_use_accessors'])
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text += " next_event: {} nsecs\n".format(dev['next_event'])
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text += " set_next_event: {}\n".format(dev['set_next_event'])
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members = [('set_state_shutdown', " shutdown: {}\n"),
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('set_state_periodic', " periodic: {}\n"),
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('set_state_oneshot', " oneshot: {}\n"),
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('set_state_oneshot_stopped', " oneshot stopped: {}\n"),
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('tick_resume', " resume: {}\n")]
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for member, fmt in members:
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if dev[member]:
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text += fmt.format(dev[member])
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text += " event_handler: {}\n".format(dev['event_handler'])
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text += " retries: {}\n".format(dev['retries'])
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return text
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def pr_cpumask(mask):
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nr_cpu_ids = 1
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if constants.LX_NR_CPUS > 1:
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nr_cpu_ids = gdb.parse_and_eval("nr_cpu_ids")
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inf = gdb.inferiors()[0]
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bits = mask['bits']
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num_bytes = (nr_cpu_ids + 7) / 8
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buf = utils.read_memoryview(inf, bits, num_bytes).tobytes()
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buf = binascii.b2a_hex(buf)
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chunks = []
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i = num_bytes
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while i > 0:
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i -= 1
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start = i * 2
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end = start + 2
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chunks.append(buf[start:end])
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if i != 0 and i % 4 == 0:
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chunks.append(',')
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extra = nr_cpu_ids % 8
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if 0 < extra <= 4:
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chunks[0] = chunks[0][0] # Cut off the first 0
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return "".join(chunks)
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class LxTimerList(gdb.Command):
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"""Print /proc/timer_list"""
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def __init__(self):
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super(LxTimerList, self).__init__("lx-timerlist", gdb.COMMAND_DATA)
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def invoke(self, arg, from_tty):
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hrtimer_bases = gdb.parse_and_eval("&hrtimer_bases")
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max_clock_bases = gdb.parse_and_eval("HRTIMER_MAX_CLOCK_BASES")
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text = "Timer List Version: gdb scripts\n"
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text += "HRTIMER_MAX_CLOCK_BASES: {}\n".format(max_clock_bases)
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text += "now at {} nsecs\n".format(ktime_get())
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for cpu in cpus.each_online_cpu():
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text += print_cpu(hrtimer_bases, cpu, max_clock_bases)
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if constants.LX_CONFIG_GENERIC_CLOCKEVENTS:
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if constants.LX_CONFIG_GENERIC_CLOCKEVENTS_BROADCAST:
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bc_dev = gdb.parse_and_eval("&tick_broadcast_device")
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text += print_tickdevice(bc_dev, -1)
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text += "\n"
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mask = gdb.parse_and_eval("tick_broadcast_mask")
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mask = pr_cpumask(mask)
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text += "tick_broadcast_mask: {}\n".format(mask)
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if constants.LX_CONFIG_TICK_ONESHOT:
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mask = gdb.parse_and_eval("tick_broadcast_oneshot_mask")
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mask = pr_cpumask(mask)
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text += "tick_broadcast_oneshot_mask: {}\n".format(mask)
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text += "\n"
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tick_cpu_devices = gdb.parse_and_eval("&tick_cpu_device")
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for cpu in cpus.each_online_cpu():
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tick_dev = cpus.per_cpu(tick_cpu_devices, cpu)
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text += print_tickdevice(tick_dev, cpu)
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text += "\n"
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gdb.write(text)
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LxTimerList()
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@ -33,3 +33,4 @@ else:
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import linux.rbtree
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import linux.proc
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import linux.constants
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import linux.timerlist
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