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authorAdrian Hunter <adrian.hunter@intel.com>2022-07-11 11:32:13 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2022-07-20 16:08:49 +0200
commit0bb82cf518779721993053888d61d9f6f2f97de7 (patch)
treeeab6a41956b4109e08beefdb278241e19c97b282 /tools/perf/util/intel-pt.c
parentperf intel-pt: Add some more logging to intel_pt_walk_next_insn() (diff)
downloadlinux-0bb82cf518779721993053888d61d9f6f2f97de7.tar.xz
linux-0bb82cf518779721993053888d61d9f6f2f97de7.zip
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.c23
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) {