73 lines
1.7 KiB
C++
73 lines
1.7 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ProfilerCPUFreq.h"
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#include "nsThreadUtils.h"
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#include <fcntl.h>
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#include <unistd.h>
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ProfilerCPUFreq::ProfilerCPUFreq() {
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if (!mCPUCounters.resize(mozilla::GetNumberOfProcessors())) {
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NS_WARNING("failing to resize the mCPUCounters vector");
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return;
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}
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for (unsigned cpuId = 0; cpuId < mCPUCounters.length(); ++cpuId) {
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const size_t buf_sz = 64;
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char buf[buf_sz];
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int rv = sprintf(
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buf, "/sys/devices/system/cpu/cpu%u/cpufreq/scaling_cur_freq", cpuId);
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if (NS_WARN_IF(rv < 0)) {
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continue;
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}
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int fd = open(buf, O_RDONLY);
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if (NS_WARN_IF(!fd)) {
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continue;
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}
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mCPUCounters[cpuId].fd = fd;
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}
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}
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ProfilerCPUFreq::~ProfilerCPUFreq() {
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for (CPUCounterInfo& CPUCounter : mCPUCounters) {
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int fd = CPUCounter.fd;
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if (NS_WARN_IF(!fd)) {
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continue;
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}
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close(fd);
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CPUCounter.fd = 0;
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}
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}
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uint32_t ProfilerCPUFreq::GetCPUSpeedMHz(unsigned cpuId) {
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MOZ_ASSERT(cpuId < mCPUCounters.length());
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int fd = mCPUCounters[cpuId].fd;
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if (NS_WARN_IF(!fd)) {
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return 0;
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}
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long rv = lseek(fd, 0, SEEK_SET);
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if (NS_WARN_IF(rv < 0)) {
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return 0;
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}
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const size_t buf_sz = 64;
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char buf[buf_sz];
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rv = read(fd, buf, buf_sz);
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if (NS_WARN_IF(rv < 0)) {
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return 0;
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}
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int cpufreq = 0;
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rv = sscanf(buf, "%u", &cpufreq);
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if (NS_WARN_IF(rv != 1)) {
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return 0;
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}
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// Convert kHz to MHz, rounding to the nearst 10Mhz, to ignore tiny
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// variations that are likely due to rounding errors.
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return uint32_t(cpufreq / 10000) * 10;
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}
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