mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-29 14:33:08 +00:00
c1d266a781
We expect the profile and bootstage to agree on timing, but when
running on slow machines there can be a larger descrepency. Increase the
tolerance to fix this.
Fixes: 9cea4797ae ("trace: Add a test")
Signed-off-by: Simon Glass <sjg@chromium.org>
305 lines
11 KiB
Python
305 lines
11 KiB
Python
# SPDX-License-Identifier: GPL-2.0
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# Copyright 2022 Google LLC
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# Written by Simon Glass <sjg@chromium.org>
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import os
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import pytest
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import re
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import u_boot_utils as util
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# This is needed for Azure, since the default '..' directory is not writeable
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TMPDIR = '/tmp/test_trace'
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# Decode a function-graph line
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RE_LINE = re.compile(r'.*\[000\]\s*([0-9.]*): func.*[|](\s*)(\S.*)?([{};])$')
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def collect_trace(cons):
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"""Build U-Boot and run it to collect a trace
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Args:
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cons (ConsoleBase): U-Boot console
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Returns:
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tuple:
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str: Filename of the output trace file
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int: Microseconds taken for initf_dm according to bootstage
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"""
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cons.run_command('trace pause')
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out = cons.run_command('trace stats')
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# The output is something like this:
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# 251,003 function sites
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# 1,160,283 function calls
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# 0 untracked function calls
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# 1,230,758 traced function calls (341538 dropped due to overflow)
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# 33 maximum observed call depth
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# 15 call depth limit
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# 748,268 calls not traced due to depth
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# 1,230,758 max function calls
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# Get a dict of values from the output
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lines = [line.split(maxsplit=1) for line in out.splitlines() if line]
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vals = {key: val.replace(',', '') for val, key in lines}
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assert int(vals['function sites']) > 100000
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assert int(vals['function calls']) > 200000
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assert int(vals['untracked function calls']) == 0
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assert int(vals['maximum observed call depth']) > 30
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assert (vals['call depth limit'] ==
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cons.config.buildconfig.get('config_trace_call_depth_limit'))
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assert int(vals['calls not traced due to depth']) > 100000
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out = cons.run_command('bootstage report')
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# Accumulated time:
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# 19,104 dm_r
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# 23,078 of_live
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# 46,280 dm_f
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dm_f_time = [line.split()[0] for line in out.replace(',', '').splitlines()
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if 'dm_f' in line]
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# Read out the trace data
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addr = 0x02000000
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size = 0x01000000
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out = cons.run_command(f'trace calls {addr:x} {size:x}')
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print(out)
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fname = os.path.join(TMPDIR, 'trace')
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out = cons.run_command(
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'host save hostfs - %x %s ${profoffset}' % (addr, fname))
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return fname, int(dm_f_time[0])
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def check_function(cons, fname, proftool, map_fname, trace_dat):
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"""Check that the 'function' output works
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Args:
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cons (ConsoleBase): U-Boot console
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fname (str): Filename of trace file
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proftool (str): Filename of proftool
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map_fname (str): Filename of System.map
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trace_dat (str): Filename of output file
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"""
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out = util.run_and_log(
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cons, [proftool, '-t', fname, '-o', trace_dat, '-m', map_fname,
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'dump-ftrace'])
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# Check that trace-cmd can read it
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out = util.run_and_log(cons, ['trace-cmd', 'dump', trace_dat])
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# Tracing meta data in file /tmp/test_trace/trace.dat:
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# [Initial format]
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# 6 [Version]
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# 0 [Little endian]
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# 4 [Bytes in a long]
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# 4096 [Page size, bytes]
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# [Header page, 205 bytes]
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# [Header event, 205 bytes]
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# [Ftrace format, 3 events]
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# [Events format, 0 systems]
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# [Kallsyms, 342244 bytes]
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# [Trace printk, 0 bytes]
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# [Saved command lines, 9 bytes]
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# 1 [CPUs with tracing data]
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# [6 options]
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# [Flyrecord tracing data]
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# [Tracing clock]
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# [local] global counter uptime perf mono mono_raw boot x86-tsc
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assert '[Flyrecord tracing data]' in out
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assert '4096 [Page size, bytes]' in out
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kallsyms = [line.split() for line in out.splitlines() if 'Kallsyms' in line]
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# [['[Kallsyms,', '342244', 'bytes]']]
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val = int(kallsyms[0][1])
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assert val > 50000 # Should be at least 50KB of symbols
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# Check that the trace has something useful
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cmd = f"trace-cmd report {trace_dat} |grep -E '(initf_|initr_)'"
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out = util.run_and_log(cons, ['sh', '-c', cmd])
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# Format:
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# unknown option 14
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# u-boot-1 [000] 60.805596: function: initf_malloc
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# u-boot-1 [000] 60.805597: function: initf_malloc
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# u-boot-1 [000] 60.805601: function: initf_bootstage
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# u-boot-1 [000] 60.805607: function: initf_bootstage
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lines = [line.replace(':', '').split() for line in out.splitlines()]
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vals = {items[4]: float(items[2]) for items in lines if len(items) == 5}
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base = None
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max_delta = 0
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for timestamp in vals.values():
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if base:
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max_delta = max(max_delta, timestamp - base)
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else:
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base = timestamp
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# Check for some expected functions
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assert 'initf_malloc' in vals.keys()
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assert 'initr_watchdog' in vals.keys()
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assert 'initr_dm' in vals.keys()
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# All the functions should be executed within five seconds at most
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assert max_delta < 5
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def check_funcgraph(cons, fname, proftool, map_fname, trace_dat):
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"""Check that the 'funcgraph' output works
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Args:
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cons (ConsoleBase): U-Boot console
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fname (str): Filename of trace file
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proftool (str): Filename of proftool
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map_fname (str): Filename of System.map
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trace_dat (str): Filename of output file
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Returns:
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int: Time taken by the first part of the initf_dm() function, in us
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"""
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# Generate the funcgraph format
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out = util.run_and_log(
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cons, [proftool, '-t', fname, '-o', trace_dat, '-m', map_fname,
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'dump-ftrace', '-f', 'funcgraph'])
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# Check that the trace has what we expect
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cmd = f'trace-cmd report {trace_dat} |head -n 70'
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out = util.run_and_log(cons, ['sh', '-c', cmd])
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# First look for this:
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# u-boot-1 [000] 282.101360: funcgraph_entry: 0.004 us | initf_malloc();
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# ...
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# u-boot-1 [000] 282.101369: funcgraph_entry: | initf_bootstage() {
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# u-boot-1 [000] 282.101369: funcgraph_entry: | bootstage_init() {
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# u-boot-1 [000] 282.101369: funcgraph_entry: | dlmalloc() {
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# ...
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# u-boot-1 [000] 282.101375: funcgraph_exit: 0.001 us | }
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# Then look for this:
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# u-boot-1 [000] 282.101375: funcgraph_exit: 0.006 us | }
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# Then check for this:
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# u-boot-1 [000] 282.101375: funcgraph_entry: 0.000 us | event_init();
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expected_indent = None
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found_start = False
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found_end = False
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upto = None
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# Look for initf_bootstage() entry and make sure we see the exit
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# Collect the time for initf_dm()
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for line in out.splitlines():
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m = RE_LINE.match(line)
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if m:
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timestamp, indent, func, brace = m.groups()
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if found_end:
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upto = func
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break
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elif func == 'initf_bootstage() ':
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found_start = True
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expected_indent = indent + ' '
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elif found_start and indent == expected_indent and brace == '}':
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found_end = True
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# The next function after initf_bootstage() exits should be event_init()
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assert upto == 'event_init()'
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# Now look for initf_dm() and dm_timer_init() so we can check the bootstage
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# time
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cmd = f"trace-cmd report {trace_dat} |grep -E '(initf_dm|dm_timer_init)'"
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out = util.run_and_log(cons, ['sh', '-c', cmd])
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start_timestamp = None
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end_timestamp = None
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for line in out.splitlines():
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m = RE_LINE.match(line)
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if m:
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timestamp, indent, func, brace = m.groups()
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if func == 'initf_dm() ':
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start_timestamp = timestamp
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elif func == 'dm_timer_init() ':
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end_timestamp = timestamp
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break
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assert start_timestamp and end_timestamp
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# Convert the time to microseconds
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return int((float(end_timestamp) - float(start_timestamp)) * 1000000)
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def check_flamegraph(cons, fname, proftool, map_fname, trace_fg):
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"""Check that the 'flamegraph' output works
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This spot checks a few call counts and estimates the time taken by the
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initf_dm() function
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Args:
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cons (ConsoleBase): U-Boot console
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fname (str): Filename of trace file
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proftool (str): Filename of proftool
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map_fname (str): Filename of System.map
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trace_fg (str): Filename of output file
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Returns:
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int: Approximate number of microseconds used by the initf_dm() function
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"""
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# Generate the flamegraph format
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out = util.run_and_log(
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cons, [proftool, '-t', fname, '-o', trace_fg, '-m', map_fname,
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'dump-flamegraph'])
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# We expect dm_timer_init() to be called twice: once before relocation and
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# once after
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look1 = 'initf_dm;dm_timer_init 1'
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look2 = 'board_init_r;initr_dm_devices;dm_timer_init 1'
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found = 0
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with open(trace_fg, 'r') as fd:
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for line in fd:
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line = line.strip()
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if line == look1 or line == look2:
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found += 1
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assert found == 2
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# Generate the timing graph
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out = util.run_and_log(
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cons, [proftool, '-t', fname, '-o', trace_fg, '-m', map_fname,
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'dump-flamegraph', '-f', 'timing'])
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# Add up all the time spend in initf_dm() and its children
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total = 0
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with open(trace_fg, 'r') as fd:
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for line in fd:
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line = line.strip()
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if line.startswith('initf_dm'):
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func, val = line.split()
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count = int(val)
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total += count
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return total
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@pytest.mark.slow
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@pytest.mark.boardspec('sandbox')
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@pytest.mark.buildconfigspec('trace')
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def test_trace(u_boot_console):
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"""Test we can build sandbox with trace, collect and process a trace"""
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cons = u_boot_console
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if not os.path.exists(TMPDIR):
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os.mkdir(TMPDIR)
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proftool = os.path.join(cons.config.build_dir, 'tools', 'proftool')
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map_fname = os.path.join(cons.config.build_dir, 'System.map')
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trace_dat = os.path.join(TMPDIR, 'trace.dat')
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trace_fg = os.path.join(TMPDIR, 'trace.fg')
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fname, dm_f_time = collect_trace(cons)
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check_function(cons, fname, proftool, map_fname, trace_dat)
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trace_time = check_funcgraph(cons, fname, proftool, map_fname, trace_dat)
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# Check that bootstage and funcgraph agree to within 10 microseconds
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diff = abs(trace_time - dm_f_time)
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print(f'trace_time {trace_time}, dm_f_time {dm_f_time}')
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assert diff / dm_f_time < 0.01
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fg_time = check_flamegraph(cons, fname, proftool, map_fname, trace_fg)
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# Check that bootstage and flamegraph agree to within 30%
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# This allows for CI being slow to run
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diff = abs(fg_time - dm_f_time)
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assert diff / dm_f_time < 0.3
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