mirror of
https://github.com/torvalds/linux.git
synced 2024-12-30 14:52:05 +00:00
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
@ -13,8 +13,10 @@
|
||||
*/
|
||||
|
||||
#include <linux/fs.h>
|
||||
#include <linux/hrtimer.h>
|
||||
#include <linux/mount.h>
|
||||
#include <linux/of_fdt.h>
|
||||
#include <linux/threads.h>
|
||||
|
||||
/* We need to stringify expanded macros so that they can be parsed */
|
||||
|
||||
@ -44,6 +46,9 @@ LX_VALUE(SB_DIRSYNC)
|
||||
LX_VALUE(SB_NOATIME)
|
||||
LX_VALUE(SB_NODIRATIME)
|
||||
|
||||
/* linux/htimer.h */
|
||||
LX_GDBPARSED(hrtimer_resolution)
|
||||
|
||||
/* linux/mount.h */
|
||||
LX_VALUE(MNT_NOSUID)
|
||||
LX_VALUE(MNT_NODEV)
|
||||
@ -52,8 +57,16 @@ LX_VALUE(MNT_NOATIME)
|
||||
LX_VALUE(MNT_NODIRATIME)
|
||||
LX_VALUE(MNT_RELATIME)
|
||||
|
||||
/* linux/threads.h */
|
||||
LX_VALUE(NR_CPUS)
|
||||
|
||||
/* linux/of_fdt.h> */
|
||||
LX_VALUE(OF_DT_HEADER)
|
||||
|
||||
/* Kernel Configs */
|
||||
LX_CONFIG(CONFIG_GENERIC_CLOCKEVENTS)
|
||||
LX_CONFIG(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST)
|
||||
LX_CONFIG(CONFIG_HIGH_RES_TIMERS)
|
||||
LX_CONFIG(CONFIG_NR_CPUS)
|
||||
LX_CONFIG(CONFIG_OF)
|
||||
LX_CONFIG(CONFIG_TICK_ONESHOT)
|
||||
|
||||
219
scripts/gdb/linux/timerlist.py
Normal file
219
scripts/gdb/linux/timerlist.py
Normal file
@ -0,0 +1,219 @@
|
||||
# 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']['next']['node']
|
||||
curr = curr.address.cast(rbtree.rb_node_type.get_type().pointer())
|
||||
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 xrange(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)
|
||||
|
||||
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(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)
|
||||
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()
|
||||
@ -33,3 +33,4 @@ else:
|
||||
import linux.rbtree
|
||||
import linux.proc
|
||||
import linux.constants
|
||||
import linux.timerlist
|
||||
|
||||
Loading…
Reference in New Issue
Block a user