You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
1.6 KiB
61 lines
1.6 KiB
/*
|
|
* Copyright (C) 2018 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include <sched.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
#include "perfetto/base/logging.h"
|
|
#include "perfetto/base/time.h"
|
|
|
|
// Skippy is a program that produces a visually identifiable stepping pattern
|
|
// in the systrace UI that is useful for debugging dropped or corrupted data.
|
|
|
|
namespace perfetto {
|
|
namespace {
|
|
|
|
void SetAffinity(size_t cpu) {
|
|
cpu_set_t set{};
|
|
CPU_SET(cpu, &set);
|
|
PERFETTO_CHECK(
|
|
sched_setaffinity(0 /* calling process */, sizeof(cpu_set_t), &set) == 0);
|
|
}
|
|
|
|
int SkippyMain() {
|
|
static size_t num_cpus = static_cast<size_t>(sysconf(_SC_NPROCESSORS_CONF));
|
|
size_t cpu = 0;
|
|
base::TimeMillis last = base::GetWallTimeMs();
|
|
|
|
SetAffinity(cpu);
|
|
|
|
for (;;) {
|
|
base::TimeMillis now = base::GetWallTimeMs();
|
|
if ((now - last) < base::TimeMillis(100))
|
|
continue;
|
|
last = now;
|
|
cpu = (cpu + 1) % num_cpus;
|
|
SetAffinity(cpu);
|
|
}
|
|
}
|
|
|
|
} // namespace
|
|
} // namespace perfetto
|
|
|
|
int main() {
|
|
return perfetto::SkippyMain();
|
|
}
|