linux-kernel - [PATCH 11/35] perf session: Create guest machines from id

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Date:   Mon, 11 Jul 2022 12:31:54 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: [PATCH 11/35] perf session: Create guest machines from id_index

Now that id_index has machine_pid, use it to create guest machines.
Create the guest machines with an idle thread because guest events
for "swapper" will be possible.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/session.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 5141fe164e97..1af981d5ad3c 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -2751,6 +2751,24 @@ void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
 	fprintf(fp, "# ========\n#\n");
 }
 
+static int perf_session__register_guest(struct perf_session *session, pid_t machine_pid)
+{
+	struct machine *machine = machines__findnew(&session->machines, machine_pid);
+	struct thread *thread;
+
+	if (!machine)
+		return -ENOMEM;
+
+	machine->single_address_space = session->machines.host.single_address_space;
+
+	thread = machine__idle_thread(machine);
+	if (!thread)
+		return -ENOMEM;
+	thread__put(thread);
+
+	return 0;
+}
+
 int perf_event__process_id_index(struct perf_session *session,
 				 union perf_event *event)
 {
@@ -2762,6 +2780,7 @@ int perf_event__process_id_index(struct perf_session *session,
 	size_t e2_sz = sizeof(struct id_index_entry_2);
 	size_t etot_sz = e1_sz + e2_sz;
 	struct id_index_entry_2 *e2;
+	pid_t last_pid = 0;
 
 	max_nr = sz / e1_sz;
 	nr = ie->nr;
@@ -2787,6 +2806,7 @@ int perf_event__process_id_index(struct perf_session *session,
 	for (i = 0; i < nr; i++, (e2 ? e2++ : 0)) {
 		struct id_index_entry *e = &ie->entries[i];
 		struct perf_sample_id *sid;
+		int ret;
 
 		if (dump_trace) {
 			fprintf(stdout,	" ... id: %"PRI_lu64, e->id);
@@ -2814,6 +2834,17 @@ int perf_event__process_id_index(struct perf_session *session,
 
 		sid->machine_pid = e2->machine_pid;
 		sid->vcpu.cpu = e2->vcpu;
+
+		if (!sid->machine_pid)
+			continue;
+
+		if (sid->machine_pid != last_pid) {
+			ret = perf_session__register_guest(session, sid->machine_pid);
+			if (ret)
+				return ret;
+			last_pid = sid->machine_pid;
+			perf_guest = true;
+		}
 	}
 	return 0;
 }
-- 
2.25.1