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perf intel-pt: Track guest context switches

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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>
This commit is contained in:
Adrian Hunter 2022-07-11 12:32:13 +03:00 committed by Arnaldo Carvalho de Melo
parent 12374a1622
commit 0bb82cf518
1 changed files with 23 additions and 0 deletions
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23
tools/perf/util/intel-pt.c
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@ -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) {