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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/process/process_metrics.h"
#include <stddef.h>
#include <stdint.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include "base/memory/ptr_util.h"
#include "base/types/expected.h"
namespace base {
namespace {
base::expected<int, ProcessCPUUsageError> GetProcessCPU(pid_t pid) {
struct kinfo_proc info;
size_t length;
int mib[] = {
CTL_KERN, KERN_PROC, KERN_PROC_PID, pid, sizeof(struct kinfo_proc), 0};
if (sysctl(mib, std::size(mib), NULL, &length, NULL, 0) < 0) {
return base::unexpected(ProcessCPUUsageError::kSystemError);
}
mib[5] = (length / sizeof(struct kinfo_proc));
if (sysctl(mib, std::size(mib), &info, &length, NULL, 0) < 0) {
return base::unexpected(ProcessCPUUsageError::kSystemError);
}
return base::ok(info.p_pctcpu);
}
} // namespace
// static
std::unique_ptr<ProcessMetrics> ProcessMetrics::CreateProcessMetrics(
ProcessHandle process) {
return WrapUnique(new ProcessMetrics(process));
}
base::expected<double, ProcessCPUUsageError>
ProcessMetrics::GetPlatformIndependentCPUUsage() {
TimeTicks time = TimeTicks::Now();
if (last_cpu_time_.is_zero()) {
// First call, just set the last values.
last_cpu_time_ = time;
return base::ok(0.0);
}
const base::expected<int, ProcessCPUUsageError> cpu = GetProcessCPU(process_);
if (!cpu.has_value()) {
return base::unexpected(cpu.error());
}
last_cpu_time_ = time;
return base::ok(double{cpu.value()} / FSCALE * 100.0);
}
base::expected<TimeDelta, ProcessCPUUsageError>
ProcessMetrics::GetCumulativeCPUUsage() {
NOTREACHED();
}
ProcessMetrics::ProcessMetrics(ProcessHandle process)
: process_(process), last_cpu_(0) {}
size_t GetSystemCommitCharge() {
int mib[] = {CTL_VM, VM_METER};
int pagesize;
struct vmtotal vmtotal;
unsigned long mem_total, mem_free, mem_inactive;
size_t len = sizeof(vmtotal);
if (sysctl(mib, std::size(mib), &vmtotal, &len, NULL, 0) < 0) {
return 0;
}
mem_total = vmtotal.t_vm;
mem_free = vmtotal.t_free;
mem_inactive = vmtotal.t_vm - vmtotal.t_avm;
pagesize = getpagesize();
return mem_total - (mem_free * pagesize) - (mem_inactive * pagesize);
}
} // namespace base
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