| // Copyright 2020 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. |
| |
| #ifndef ASH_HUD_DISPLAY_CPU_STATS_H_ |
| #define ASH_HUD_DISPLAY_CPU_STATS_H_ |
| |
| #include <cstdint> |
| |
| namespace ash { |
| namespace hud_display { |
| |
| // All CPU entries from /proc/stat. |
| struct CpuStats { |
| // These are the raw values read from /proc/stat, so as noted below, |
| // their interpretation depends on the architechture. But we are using them |
| // to plot relative values (0% - 100%) and thus the absolute values are not |
| // important. |
| // [man 5 proc]: Time, measured in units of USER_HZ (1/100ths of a second on |
| // most architectures, use sysconf(_SC_CLK_TCK) to obtain the right value). |
| uint64_t user; // Time spent in user mode. |
| uint64_t nice; // Time spent in user mode with low priority (nice) |
| uint64_t system; // Time spent in system mode. |
| uint64_t idle; // Time spent in the idle task. (follows /proc/uptme) |
| uint64_t iowait; // Time waiting for I/O to complete. Not reliable. |
| uint64_t irq; // Time servicing interrupts. |
| uint64_t softirq; // Time servicing softirqs. |
| uint64_t steal; // Stolen time, which is the time spent in other operating |
| // systems when running in a virtualized environment. |
| uint64_t guest; // Time spent running a virtual CPU for guest operating |
| // systems under the control of the Linux kernel. |
| uint64_t guest_nice; // Time spent running a niced guest (virtual CPU for |
| // guest operating systems under the control of the |
| // Linux kernel). |
| }; |
| |
| // Parses current /proc/stat and restuns current values. |
| // Must be called on io-enabled thread. |
| CpuStats GetProcStatCPU(); |
| |
| } // namespace hud_display |
| } // namespace ash |
| |
| #endif // ASH_HUD_DISPLAY_CPU_STATS_H_ |