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authorArnaldo Carvalho de Melo <acme@redhat.com>2018-01-22 17:42:11 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2018-01-25 12:37:29 +0300
commit522283fec7d3f312224360da48057e923ee22765 (patch)
tree65befc7c681e95faf296bbc18f3e2af024a39ca8 /tools
parent591421e151ddf95e43d690a5c9b291d8e1cb8065 (diff)
downloadlinux-522283fec7d3f312224360da48057e923ee22765.tar.xz
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')
-rw-r--r--tools/perf/builtin-trace.c13
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)