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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #include "extensions/browser/api/system_cpu/cpu_info_provider.h" | 5 #include "extensions/browser/api/system_cpu/cpu_info_provider.h" |
| 6 | 6 |
| 7 #include <cstdio> | 7 #include <cstdio> |
| 8 #include <sstream> | 8 #include <sstream> |
| 9 | 9 |
| 10 #include "base/files/file_util.h" | 10 #include "base/files/file_util.h" |
| 11 #include "base/format_macros.h" | 11 #include "base/format_macros.h" |
| 12 | 12 |
| 13 namespace extensions { | 13 namespace extensions { |
| 14 | 14 |
| 15 namespace { | 15 namespace { |
| 16 | 16 |
| 17 const char kProcStat[] = "/proc/stat"; | 17 const char kProcStat[] = "/proc/stat"; |
| 18 | 18 |
| 19 } // namespace | 19 } // namespace |
| 20 | 20 |
| 21 bool CpuInfoProvider::QueryCpuTimePerProcessor( | 21 bool CpuInfoProvider::QueryCpuTimePerProcessor( |
| 22 std::vector<linked_ptr<core_api::system_cpu::ProcessorInfo> >* infos) { | 22 std::vector<linked_ptr<api::system_cpu::ProcessorInfo>>* infos) { |
| 23 DCHECK(infos); | 23 DCHECK(infos); |
| 24 | 24 |
| 25 // WARNING: this method may return incomplete data because some processors may | 25 // WARNING: this method may return incomplete data because some processors may |
| 26 // be brought offline at runtime. /proc/stat does not report statistics of | 26 // be brought offline at runtime. /proc/stat does not report statistics of |
| 27 // offline processors. CPU usages of offline processors will be filled with | 27 // offline processors. CPU usages of offline processors will be filled with |
| 28 // zeros. | 28 // zeros. |
| 29 // | 29 // |
| 30 // An example of output of /proc/stat when processor 0 and 3 are online, but | 30 // An example of output of /proc/stat when processor 0 and 3 are online, but |
| 31 // processor 1 and 2 are offline: | 31 // processor 1 and 2 are offline: |
| 32 // | 32 // |
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| 66 infos->at(pindex)->usage.user = static_cast<double>(user + nice); | 66 infos->at(pindex)->usage.user = static_cast<double>(user + nice); |
| 67 infos->at(pindex)->usage.idle = static_cast<double>(idle); | 67 infos->at(pindex)->usage.idle = static_cast<double>(idle); |
| 68 infos->at(pindex)->usage.total = | 68 infos->at(pindex)->usage.total = |
| 69 static_cast<double>(sys + user + nice + idle); | 69 static_cast<double>(sys + user + nice + idle); |
| 70 } | 70 } |
| 71 | 71 |
| 72 return true; | 72 return true; |
| 73 } | 73 } |
| 74 | 74 |
| 75 } // namespace extensions | 75 } // namespace extensions |
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