diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2022-07-11 12:32:13 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-07-20 17:08:49 +0300 |
| commit | 0bb82cf518779721993053888d61d9f6f2f97de7 (patch) | |
| tree | eab6a41956b4109e08beefdb278241e19c97b282 /tools/perf/util/intel-pt.c | |
| parent | 12374a16223aff68ba85727da0fa4297e6b9ee97 (diff) | |
| download | linux-0bb82cf518779721993053888d61d9f6f2f97de7.tar.xz | |
perf intel-pt: Track guest context switches
Use guest context switch events to keep track of which guest thread is
running on a particular guest machine and VCPU.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220711093218.10967-31-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/intel-pt.c')
| -rw-r--r-- | tools/perf/util/intel-pt.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c index a8798b5bb311..98b097fec476 100644 --- a/tools/perf/util/intel-pt.c +++ b/tools/perf/util/intel-pt.c @@ -78,6 +78,7 @@ struct intel_pt { bool use_thread_stack; bool callstack; bool cap_event_trace; + bool have_guest_sideband; unsigned int br_stack_sz; unsigned int br_stack_sz_plus; int have_sched_switch; @@ -3079,6 +3080,25 @@ static int intel_pt_context_switch_in(struct intel_pt *pt, return machine__set_current_tid(pt->machine, cpu, pid, tid); } +static int intel_pt_guest_context_switch(struct intel_pt *pt, + union perf_event *event, + struct perf_sample *sample) +{ + bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT; + struct machines *machines = &pt->session->machines; + struct machine *machine = machines__find(machines, sample->machine_pid); + + pt->have_guest_sideband = true; + + if (out) + return 0; + + if (!machine) + return -EINVAL; + + return machine__set_current_tid(machine, sample->vcpu, sample->pid, sample->tid); +} + static int intel_pt_context_switch(struct intel_pt *pt, union perf_event *event, struct perf_sample *sample) { @@ -3086,6 +3106,9 @@ static int intel_pt_context_switch(struct intel_pt *pt, union perf_event *event, pid_t pid, tid; int cpu, ret; + if (perf_event__is_guest(event)) + return intel_pt_guest_context_switch(pt, event, sample); + cpu = sample->cpu; if (pt->have_sched_switch == 3) { |