OpenE2K/linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

perf trace: Add --print-sample

Browse Source 
To help with debugging, like the interrupted out of order issue that
will be dealt with in the next patch in this series, changing the code
to deal with:

raw_syscalls:sys_enter 411967179.269 Timer 9609/9626 [2]
raw_syscalls:sys_enter 411967179.213 file:// Content 9609/9609 [3]
   328.038 (18446744073709.496 ms): Timer/9626 futex(uaddr: 0x7fc0d4027044, op: WAIT|PRIV, utime: 0x7fc0b0ffdb50     ) ...
 raw_syscalls:sys_exit 411967179.225 file:// Content 9609/9609 [3]
   327.982 ( 0.012 ms): file:// Conten/9609 futex(uaddr: 0x7fc0d4027040, op: WAKE|PRIV, val: 1                    ) = 1

That long duration is the bug.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-fljqiibjn7wet24jd1ed7abc@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2018-01-22 11:38:54 -03:00
parent 78c436907c
commit 591421e151
2 changed files with 28 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
tools/perf/Documentation/perf-trace.txt
View File

@ -163,6 +163,10 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs.
Implies '--call-graph dwarf' when --call-graph not present on the
command line, on systems where DWARF unwinding was built in.
--print-sample::
Print the PERF_RECORD_SAMPLE PERF_SAMPLE_ info for the
raw_syscalls:sys_{enter,exit} tracepoints, for debugging.
--proc-map-timeout::
When processing pre-existing threads /proc/XXX/mmap, it may take a long time,
because the file may be huge. A time out is needed in such cases.

24
tools/perf/builtin-trace.c
View File

@ -110,6 +110,7 @@ struct trace {
bool summary;
bool summary_only;
bool show_comm;
bool print_sample;
bool show_tool_stats;
bool trace_syscalls;
bool kernel_syscallchains;
@ -1578,6 +1579,23 @@ static int trace__printf_interrupted_entry(struct trace *trace, struct perf_samp
return printed;
}
static int trace__fprintf_sample(struct trace *trace, struct perf_evsel *evsel,
struct perf_sample *sample, struct thread *thread)
{
int printed = 0;
if (trace->print_sample) {
double ts = (double)sample->time / NSEC_PER_MSEC;
printed += fprintf(trace->output, "%22s %10.3f %s %d/%d [%d]\n",
perf_evsel__name(evsel), ts,
thread__comm_str(thread),
sample->pid, sample->tid, sample->cpu);
}
return printed;
}
static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
union perf_event *event __maybe_unused,
struct perf_sample *sample)
@ -1598,6 +1616,8 @@ static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
if (ttrace == NULL)
goto out_put;
trace__fprintf_sample(trace, evsel, sample, thread);
args = perf_evsel__sc_tp_ptr(evsel, args, sample);
if (ttrace->entry_str == NULL) {
@ -1688,6 +1708,8 @@ static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
if (ttrace == NULL)
goto out_put;
trace__fprintf_sample(trace, evsel, sample, thread);
if (trace->summary)
thread__update_stats(ttrace, id, sample);
@ -3034,6 +3056,8 @@ int cmd_trace(int argc, const char **argv)
"Set the maximum stack depth when parsing the callchain, "
"anything beyond the specified depth will be ignored. "
"Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
OPT_BOOLEAN(0, "print-sample", &trace.print_sample,
"print the PERF_RECORD_SAMPLE PERF_SAMPLE_ info, for debugging"),
OPT_UINTEGER(0, "proc-map-timeout", &trace.opts.proc_map_timeout,
"per thread proc mmap processing timeout in ms"),
OPT_UINTEGER('D', "delay", &trace.opts.initial_delay,