e412dd12e8
Currently, there are some useless includes in the codebase. We can use a tool named include-what-you-use to optimize these includes. By using a strict include-what-you-use policy, we can get lots of benefits from it.
78 lines
2.9 KiB
C++
78 lines
2.9 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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// This file is copied from
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// https://github.com/apache/impala/blob/branch-2.9.0/be/src/util/os-info.cc
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// and modified by Doris
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#include "util/os_info.h"
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#include <fstream>
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namespace doris {
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bool OsInfo::initialized_ = false;
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std::string OsInfo::os_version_ = "Unknown";
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clockid_t OsInfo::fast_clock_ = CLOCK_MONOTONIC;
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std::string OsInfo::clock_name_ = "Unknown clocksource, clockid_t defaulting to CLOCK_MONOTONIC";
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// CLOCK_MONOTONIC_COARSE was added in Linux 2.6.32. For now we still want to support
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// older kernels by falling back to CLOCK_MONOTONIC.
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#ifdef CLOCK_MONOTONIC_COARSE
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#define HAVE_CLOCK_MONOTONIC_COARSE true
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#else
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#define HAVE_CLOCK_MONOTONIC_COARSE false
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#define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC
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#endif
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void OsInfo::Init() {
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DCHECK(!initialized_);
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// Read from /proc/version
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std::ifstream version("/proc/version", std::ios::in);
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if (version.good()) getline(version, os_version_);
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if (version.is_open()) version.close();
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// Read the current clocksource to see if CLOCK_MONOTONIC is known to be fast. "tsc" is
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// fast, while "xen" is slow (40 times slower than "tsc" on EC2). If CLOCK_MONOTONIC is
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// known to be slow, we use CLOCK_MONOTONIC_COARSE, which uses jiffies, with a
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// resolution measured in milliseconds, rather than nanoseconds.
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std::ifstream clocksource_file(
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"/sys/devices/system/clocksource/clocksource0/current_clocksource");
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if (clocksource_file.good()) {
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std::string clocksource;
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clocksource_file >> clocksource;
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clock_name_ = "clocksource: '" + clocksource + "', clockid_t: ";
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if (HAVE_CLOCK_MONOTONIC_COARSE && clocksource != "tsc") {
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clock_name_ += "CLOCK_MONOTONIC_COARSE";
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fast_clock_ = CLOCK_MONOTONIC_COARSE;
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} else {
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clock_name_ += "CLOCK_MONOTONIC";
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fast_clock_ = CLOCK_MONOTONIC;
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}
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}
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initialized_ = true;
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}
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std::string OsInfo::DebugString() {
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DCHECK(initialized_);
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std::stringstream stream;
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stream << "OS version: " << os_version_ << std::endl << "Clock: " << clock_name_ << std::endl;
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return stream.str();
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}
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} // namespace doris
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