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author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-04-12 13:11:07 (GMT) |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-04-13 13:11:50 (GMT) |
commit | 202ff9684a912c96e0f2fac65e34280a97ad3611 (patch) | |
tree | b7063810c0240aa6ac293aba150d0ed34db85707 /tools/perf | |
parent | 31d50c551e30923b86a1b5b420920dd1927fa63b (diff) | |
download | linux-202ff9684a912c96e0f2fac65e34280a97ad3611.tar.xz |
perf trace: Support callchains for --event too
We already were able to ask for callchains for a specific event:
# trace -e nanosleep --call dwarf --event sched:sched_switch/call-graph=fp/ usleep 1
This would enable tracing just the "nanosleep" syscall, with callchains
at syscall exit and would ask the kernel for frame pointer callchains to
be enabled for the "sched:sched_switch" tracepoint event, its just that
we were not resolving the callchain and printing it in 'perf trace', do
it:
# trace -e nanosleep --call dwarf --event sched:sched_switch/call-graph=fp/ usleep 1
0.425 ( 0.013 ms): usleep/6718 nanosleep(rqtp: 0x7ffcc1d16e20) ...
0.425 ( ): sched:sched_switch:usleep:6718 [120] S ==> swapper/2:0 [120])
__schedule+0xfe200402 ([kernel.kallsyms])
schedule+0xfe200035 ([kernel.kallsyms])
do_nanosleep+0xfe20006f ([kernel.kallsyms])
hrtimer_nanosleep+0xfe2000dc ([kernel.kallsyms])
sys_nanosleep+0xfe20007a ([kernel.kallsyms])
do_syscall_64+0xfe200062 ([kernel.kallsyms])
return_from_SYSCALL_64+0xfe200000 ([kernel.kallsyms])
__nanosleep+0xffff008b8cbe2010 (/usr/lib64/libc-2.22.so)
0.486 ( 0.073 ms): usleep/6718 ... [continued]: nanosleep()) = 0
__nanosleep+0x10 (/usr/lib64/libc-2.22.so)
usleep+0x34 (/usr/lib64/libc-2.22.so)
main+0x1eb (/usr/bin/usleep)
__libc_start_main+0xf0 (/usr/lib64/libc-2.22.so)
_start+0x29 (/usr/bin/usleep)
#
Pretty compact, huh? DWARF callchains for raw_syscalls:sys_exit + frame
pointer callchains for a tracepoint, if your hardware supports LBR, go
wild with /call-graph=lbr/, guess the next step is to lift this from
'perf script':
-F, --fields <str> comma separated output fields prepend with 'type:'. Valid types: hw,sw,trace,raw.
Fields: comm,tid,pid,time,cpu,event,trace,ip,sym,dso,addr,symoff,period,iregs,brstack,brstacksym,flags
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-2e7yiv5hqdm8jywlmfivvx2v@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 | 41 |
1 files changed, 26 insertions, 15 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 2ec53ed..a6e05e1 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -2114,6 +2114,28 @@ out_put: return err; } +static int trace__fprintf_callchain(struct trace *trace, struct perf_evsel *evsel, + struct perf_sample *sample) +{ + struct addr_location al; + /* TODO: user-configurable print_opts */ + const unsigned int print_opts = PRINT_IP_OPT_SYM | + PRINT_IP_OPT_DSO | + PRINT_IP_OPT_UNKNOWN_AS_ADDR; + + if (sample->callchain == NULL) + return 0; + + if (machine__resolve(trace->host, &al, sample) < 0) { + pr_err("Problem processing %s callchain, skipping...\n", + perf_evsel__name(evsel)); + return 0; + } + + return perf_evsel__fprintf_callchain(evsel, sample, &al, 38, print_opts, + scripting_max_stack, trace->output); +} + static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel, union perf_event *event __maybe_unused, struct perf_sample *sample) @@ -2193,21 +2215,7 @@ signed_print: fputc('\n', trace->output); - if (sample->callchain) { - struct addr_location al; - /* TODO: user-configurable print_opts */ - const unsigned int print_opts = PRINT_IP_OPT_SYM | - PRINT_IP_OPT_DSO | - PRINT_IP_OPT_UNKNOWN_AS_ADDR; - - if (machine__resolve(trace->host, &al, sample) < 0) { - pr_err("problem processing %d event, skipping it.\n", - event->header.type); - goto out_put; - } - perf_evsel__fprintf_callchain(evsel, sample, &al, 38, print_opts, - scripting_max_stack, trace->output); - } + trace__fprintf_callchain(trace, evsel, sample); out: ttrace->entry_pending = false; err = 0; @@ -2355,6 +2363,9 @@ static int trace__event_handler(struct trace *trace, struct perf_evsel *evsel, } fprintf(trace->output, ")\n"); + + trace__fprintf_callchain(trace, evsel, sample); + return 0; } |