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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// 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/macros.h"
#include "base/memory/ptr_util.h"
#include "base/process/process_metrics_iocounters.h"
namespace base {
// static
std::unique_ptr<ProcessMetrics> ProcessMetrics::CreateProcessMetrics(
ProcessHandle process) {
return WrapUnique(new ProcessMetrics(process));
}
bool ProcessMetrics::GetIOCounters(IoCounters* io_counters) const {
return false;
}
static int 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, arraysize(mib), NULL, &length, NULL, 0) < 0)
return -1;
mib[5] = (length / sizeof(struct kinfo_proc));
if (sysctl(mib, arraysize(mib), &info, &length, NULL, 0) < 0)
return 0;
return info.p_pctcpu;
}
double ProcessMetrics::GetPlatformIndependentCPUUsage() {
TimeTicks time = TimeTicks::Now();
if (last_cpu_ == 0) {
// First call, just set the last values.
last_cpu_time_ = time;
last_cpu_ = GetProcessCPU(process_);
return 0;
}
int64_t time_delta = (time - last_cpu_time_).InMicroseconds();
DCHECK_NE(time_delta, 0);
if (time_delta == 0)
return 0;
int cpu = GetProcessCPU(process_);
last_cpu_time_ = time;
last_cpu_ = cpu;
double percentage = static_cast<double>((cpu * 100.0) / FSCALE);
return percentage;
}
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, arraysize(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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