1 /*
2 * Copyright (C) 2024 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "src/trace_redaction/merge_threads.h"
18
19 namespace perfetto::trace_redaction {
20
Modify(const Context & context,uint64_t ts,int32_t cpu,int32_t * pid,std::string * comm) const21 void MergeThreadsPids::Modify(const Context& context,
22 uint64_t ts,
23 int32_t cpu,
24 int32_t* pid,
25 std::string* comm) const {
26 // When Modify() is used with RedactFtraceEvents, comm will be null.
27 PERFETTO_DCHECK(pid);
28
29 // Avoid re-mapping system threads (pid 0). These pids have special uses (e.g.
30 // cpu_idle) and if re-mapped, important structures break (e.g. remapping
31 // cpu_idle's pid breaks scheduling).
32
33 if (*pid == 0) {
34 return;
35 }
36
37 if (context.timeline->PidConnectsToUid(ts, *pid, *context.package_uid)) {
38 return;
39 }
40
41 *pid = context.synthetic_process->RunningOn(cpu);
42
43 if (comm) {
44 comm->clear();
45 }
46 }
47
48 } // namespace perfetto::trace_redaction
49