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perf record: Respect --no-switch-events

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Context switch events are added automatically by Intel PT and Coresight.

Make it possible to suppress them. That is useful for tracing the
scheduler without the disturbance that the switch event processing
creates.

Example:

  Prerequisites:

    $ which perf
    ~/bin/perf
    $ 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
    [ perf record: Woken up 1 times to write data ]
    [ perf record: Captured and wrote 0.938 MB perf.data ]
    $ perf script -D | grep PERF_RECORD_SWITCH | wc -l
    572

  After:

    $ 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 ]
    $ perf script -D | grep PERF_RECORD_SWITCH | wc -l
    0

    $ sudo chmod go-r /proc/kcore
    $ sudo setcap -r ~/bin/perf

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.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/20200528120859.21604-1-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2020-05-28 15:08:58 +03:00 committed by Arnaldo Carvalho de Melo
parent b51640854d
commit 16b4b4e1a0
5 changed files with 16 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
tools/perf/Documentation/perf-record.txt
View file

@ -458,7 +458,9 @@ This option sets the time out limit. The default value is 500 ms.
--switch-events::
Record context switch events i.e. events of type PERF_RECORD_SWITCH or
PERF_RECORD_SWITCH_CPU_WIDE.
PERF_RECORD_SWITCH_CPU_WIDE. In some cases (e.g. Intel PT or CoreSight)
switch events will be enabled automatically, which can be suppressed by
by the option --no-switch-events.
--clang-path=PATH::
Path to clang binary to use for compiling BPF scriptlets.

3
tools/perf/arch/arm/util/cs-etm.c
View file

@ -265,7 +265,8 @@ static int cs_etm_recording_options(struct auxtrace_record *itr,
ptr->evlist = evlist;
ptr->snapshot_mode = opts->auxtrace_snapshot_mode;
if (perf_can_record_switch_events())
if (!record_opts__no_switch_events(opts) &&
perf_can_record_switch_events())
opts->record_switch_events = true;
evlist__for_each_entry(evlist, evsel) {

3
tools/perf/arch/x86/util/intel-pt.c
View file

@ -787,7 +787,8 @@ static int intel_pt_recording_options(struct auxtrace_record *itr,
* Per-cpu recording needs sched_switch events to distinguish different
* threads.
*/
if (have_timing_info && !perf_cpu_map__empty(cpus)) {
if (have_timing_info && !perf_cpu_map__empty(cpus) &&
!record_opts__no_switch_events(opts)) {
if (perf_can_record_switch_events()) {
bool cpu_wide = !target__none(&opts->target) &&
!target__has_task(&opts->target);

5
tools/perf/builtin-record.c
View file

@ -2501,8 +2501,9 @@ static struct option __record_options[] = {
"Record namespaces events"),
OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup,
"Record cgroup events"),
OPT_BOOLEAN(0, "switch-events", &record.opts.record_switch_events,
"Record context switch events"),
OPT_BOOLEAN_SET(0, "switch-events", &record.opts.record_switch_events,
&record.opts.record_switch_events_set,
"Record context switch events"),
OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
"Configure all used events to run in kernel space.",
PARSE_OPT_EXCLUSIVE),

6
tools/perf/util/record.h
View file

@ -36,6 +36,7 @@ struct record_opts {
bool record_namespaces;
bool record_cgroup;
bool record_switch_events;
bool record_switch_events_set;
bool all_kernel;
bool all_user;
bool kernel_callchains;
@ -76,4 +77,9 @@ extern struct option *record_options;
int record__parse_freq(const struct option *opt, const char *str, int unset);
static inline bool record_opts__no_switch_events(const struct record_opts *opts)
{
return opts->record_switch_events_set && !opts->record_switch_events;
}
#endif // _PERF_RECORD_H