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| author | Adrian Hunter <adrian.hunter@intel.com> | 2020-05-28 15:08:59 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-05-28 17:37:45 +0300 |
| commit | 9b2d2066ddf6f38c79aa38321544999fa943f0e0 (patch) | |
| tree | 416f1d5399ed2a8317cda75e6f2db9706ee66efd | |
| parent | 16b4b4e1a0038365a6734a4f50aba77e57865c8e (diff) | |
| download | linux-9b2d2066ddf6f38c79aa38321544999fa943f0e0.tar.xz | |
perf intel-pt: Refine kernel decoding only warning message
Stop the message displaying when user space is not being traced.
Example:
Prerequisites:
sudo setcap "cap_sys_rawio,cap_sys_admin,cap_sys_ptrace,cap_syslog,cap_ipc_lock=ep" ~/bin/perf
sudo chmod +r /proc/kcore
Before:
$ perf record --no-switch-events --kcore -a -e intel_pt//k -- sleep 0.001
Warning:
Intel Processor Trace decoding will not be possible except for kernel tracing!
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.838 MB perf.data ]
After:
$ perf record --no-switch-events --kcore -a -e intel_pt//k -- sleep 0.001
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.068 MB perf.data ]
$ sudo chmod go-r /proc/kcore
$ sudo setcap -r ~/bin/perf
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: http://lore.kernel.org/lkml/20200528120859.21604-2-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/arch/x86/util/intel-pt.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/perf/arch/x86/util/intel-pt.c b/tools/perf/arch/x86/util/intel-pt.c index de69c8a34e15..839ef52c1ac2 100644 --- a/tools/perf/arch/x86/util/intel-pt.c +++ b/tools/perf/arch/x86/util/intel-pt.c @@ -883,7 +883,8 @@ static int intel_pt_recording_options(struct auxtrace_record *itr, * per-cpu with no sched_switch (except workload-only). */ if (!ptr->have_sched_switch && !perf_cpu_map__empty(cpus) && - !target__none(&opts->target)) + !target__none(&opts->target) && + !intel_pt_evsel->core.attr.exclude_user) ui__warning("Intel Processor Trace decoding will not be possible except for kernel tracing!\n"); return 0; |