diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-01-22 11:42:11 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-01-25 06:37:29 -0300 |
| commit | 522283fec7d3f312224360da48057e923ee22765 (patch) | |
| tree | 65befc7c681e95faf296bbc18f3e2af024a39ca8 /tools/perf | |
| parent | 591421e151ddf95e43d690a5c9b291d8e1cb8065 (diff) | |
perf trace: Do not print from time delta for interrupted syscall lines
We were calculating the delta from a in-flight syscall that got its
output interrupted by another syscall, which doesn't seem like useful
information, we will print the syscall duration (sys_exit - sys_enter)
when the raw_syscalls:sys_exit event happens.
The problem here is how we're consuming the multiple ring buffers,
without using the ordered_events code used by perf_session, which may
cause some reordering of syscalls for diferent CPUs, so just stop
printing that delta, to avoid things like:
# trace --print-sample -p 9626 -e futex
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
This is a bandaid, we should better try and use the ordered_events code,
possibly with some refactoring prep work, but for now at least we don't
show those false long deltas for the lines ending in '...'.
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-q6xgsqrju1sr6ltud9kjjhmb@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/builtin-trace.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 322c2b15e407..ab00096328e4 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -821,7 +821,7 @@ static size_t fprintf_duration(unsigned long t, bool calculated, FILE *fp) size_t printed = fprintf(fp, "("); if (!calculated) - printed += fprintf(fp, " ? "); + printed += fprintf(fp, " "); else if (duration >= 1.0) printed += color_fprintf(fp, PERF_COLOR_RED, "%6.3f ms", duration); else if (duration >= 0.01) @@ -1556,10 +1556,9 @@ static void thread__update_stats(struct thread_trace *ttrace, update_stats(stats, duration); } -static int trace__printf_interrupted_entry(struct trace *trace, struct perf_sample *sample) +static int trace__printf_interrupted_entry(struct trace *trace) { struct thread_trace *ttrace; - u64 duration; size_t printed; if (trace->current == NULL) @@ -1570,9 +1569,7 @@ static int trace__printf_interrupted_entry(struct trace *trace, struct perf_samp if (!ttrace->entry_pending) return 0; - duration = sample->time - ttrace->entry_time; - - printed = trace__fprintf_entry_head(trace, trace->current, duration, true, ttrace->entry_time, trace->output); + printed = trace__fprintf_entry_head(trace, trace->current, 0, false, ttrace->entry_time, trace->output); printed += fprintf(trace->output, "%-70s) ...\n", ttrace->entry_str); ttrace->entry_pending = false; @@ -1627,7 +1624,7 @@ static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel, } if (!(trace->duration_filter || trace->summary_only || trace->min_stack)) - trace__printf_interrupted_entry(trace, sample); + trace__printf_interrupted_entry(trace); ttrace->entry_time = sample->time; msg = ttrace->entry_str; @@ -1941,7 +1938,7 @@ static int trace__event_handler(struct trace *trace, struct perf_evsel *evsel, } } - trace__printf_interrupted_entry(trace, sample); + trace__printf_interrupted_entry(trace); trace__fprintf_tstamp(trace, sample->time, trace->output); if (trace->trace_syscalls) |