1/* SPDX-License-Identifier: LGPL-2.1 WITH Linux-syscall-note */ 2/* taskstats.h - exporting per-task statistics 3 * 4 * Copyright (C) Shailabh Nagar, IBM Corp. 2006 5 * (C) Balbir Singh, IBM Corp. 2006 6 * (C) Jay Lan, SGI, 2006 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of version 2.1 of the GNU Lesser General Public License 10 * as published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it would be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 15 */ 16 17#ifndef _LINUX_TASKSTATS_H 18#define _LINUX_TASKSTATS_H 19 20#include <linux/types.h> 21 22/* Format for per-task data returned to userland when 23 * - a task exits 24 * - listener requests stats for a task 25 * 26 * The struct is versioned. Newer versions should only add fields to 27 * the bottom of the struct to maintain backward compatibility. 28 * 29 * 30 * To add new fields 31 * a) bump up TASKSTATS_VERSION 32 * b) add comment indicating new version number at end of struct 33 * c) add new fields after version comment; maintain 64-bit alignment 34 */ 35 36 37#define TASKSTATS_VERSION 8 38#define TS_COMM_LEN 32 /* should be >= TASK_COMM_LEN 39 * in linux/sched.h */ 40 41struct taskstats { 42 43 /* The version number of this struct. This field is always set to 44 * TAKSTATS_VERSION, which is defined in <linux/taskstats.h>. 45 * Each time the struct is changed, the value should be incremented. 46 */ 47 __u16 version; 48 __u32 ac_exitcode; /* Exit status */ 49 50 /* The accounting flags of a task as defined in <linux/acct.h> 51 * Defined values are AFORK, ASU, ACOMPAT, ACORE, and AXSIG. 52 */ 53 __u8 ac_flag; /* Record flags */ 54 __u8 ac_nice; /* task_nice */ 55 56 /* Delay accounting fields start 57 * 58 * All values, until comment "Delay accounting fields end" are 59 * available only if delay accounting is enabled, even though the last 60 * few fields are not delays 61 * 62 * xxx_count is the number of delay values recorded 63 * xxx_delay_total is the corresponding cumulative delay in nanoseconds 64 * 65 * xxx_delay_total wraps around to zero on overflow 66 * xxx_count incremented regardless of overflow 67 */ 68 69 /* Delay waiting for cpu, while runnable 70 * count, delay_total NOT updated atomically 71 */ 72 __u64 cpu_count __attribute__((aligned(8))); 73 __u64 cpu_delay_total; 74 75 /* Following four fields atomically updated using task->delays->lock */ 76 77 /* Delay waiting for synchronous block I/O to complete 78 * does not account for delays in I/O submission 79 */ 80 __u64 blkio_count; 81 __u64 blkio_delay_total; 82 83 /* Delay waiting for page fault I/O (swap in only) */ 84 __u64 swapin_count; 85 __u64 swapin_delay_total; 86 87 /* cpu "wall-clock" running time 88 * On some architectures, value will adjust for cpu time stolen 89 * from the kernel in involuntary waits due to virtualization. 90 * Value is cumulative, in nanoseconds, without a corresponding count 91 * and wraps around to zero silently on overflow 92 */ 93 __u64 cpu_run_real_total; 94 95 /* cpu "virtual" running time 96 * Uses time intervals seen by the kernel i.e. no adjustment 97 * for kernel's involuntary waits due to virtualization. 98 * Value is cumulative, in nanoseconds, without a corresponding count 99 * and wraps around to zero silently on overflow 100 */ 101 __u64 cpu_run_virtual_total; 102 /* Delay accounting fields end */ 103 /* version 1 ends here */ 104 105 /* Basic Accounting Fields start */ 106 char ac_comm[TS_COMM_LEN]; /* Command name */ 107 __u8 ac_sched __attribute__((aligned(8))); 108 /* Scheduling discipline */ 109 __u8 ac_pad[3]; 110 __u32 ac_uid __attribute__((aligned(8))); 111 /* User ID */ 112 __u32 ac_gid; /* Group ID */ 113 __u32 ac_pid; /* Process ID */ 114 __u32 ac_ppid; /* Parent process ID */ 115 __u32 ac_btime; /* Begin time [sec since 1970] */ 116 __u64 ac_etime __attribute__((aligned(8))); 117 /* Elapsed time [usec] */ 118 __u64 ac_utime; /* User CPU time [usec] */ 119 __u64 ac_stime; /* SYstem CPU time [usec] */ 120 __u64 ac_minflt; /* Minor Page Fault Count */ 121 __u64 ac_majflt; /* Major Page Fault Count */ 122 /* Basic Accounting Fields end */ 123 124 /* Extended accounting fields start */ 125 /* Accumulated RSS usage in duration of a task, in MBytes-usecs. 126 * The current rss usage is added to this counter every time 127 * a tick is charged to a task's system time. So, at the end we 128 * will have memory usage multiplied by system time. Thus an 129 * average usage per system time unit can be calculated. 130 */ 131 __u64 coremem; /* accumulated RSS usage in MB-usec */ 132 /* Accumulated virtual memory usage in duration of a task. 133 * Same as acct_rss_mem1 above except that we keep track of VM usage. 134 */ 135 __u64 virtmem; /* accumulated VM usage in MB-usec */ 136 137 /* High watermark of RSS and virtual memory usage in duration of 138 * a task, in KBytes. 139 */ 140 __u64 hiwater_rss; /* High-watermark of RSS usage, in KB */ 141 __u64 hiwater_vm; /* High-water VM usage, in KB */ 142 143 /* The following four fields are I/O statistics of a task. */ 144 __u64 read_char; /* bytes read */ 145 __u64 write_char; /* bytes written */ 146 __u64 read_syscalls; /* read syscalls */ 147 __u64 write_syscalls; /* write syscalls */ 148 /* Extended accounting fields end */ 149 150#define TASKSTATS_HAS_IO_ACCOUNTING 151 /* Per-task storage I/O accounting starts */ 152 __u64 read_bytes; /* bytes of read I/O */ 153 __u64 write_bytes; /* bytes of write I/O */ 154 __u64 cancelled_write_bytes; /* bytes of cancelled write I/O */ 155 156 __u64 nvcsw; /* voluntary_ctxt_switches */ 157 __u64 nivcsw; /* nonvoluntary_ctxt_switches */ 158 159 /* time accounting for SMT machines */ 160 __u64 ac_utimescaled; /* utime scaled on frequency etc */ 161 __u64 ac_stimescaled; /* stime scaled on frequency etc */ 162 __u64 cpu_scaled_run_real_total; /* scaled cpu_run_real_total */ 163 164 /* Delay waiting for memory reclaim */ 165 __u64 freepages_count; 166 __u64 freepages_delay_total; 167}; 168 169 170/* 171 * Commands sent from userspace 172 * Not versioned. New commands should only be inserted at the enum's end 173 * prior to __TASKSTATS_CMD_MAX 174 */ 175 176enum { 177 TASKSTATS_CMD_UNSPEC = 0, /* Reserved */ 178 TASKSTATS_CMD_GET, /* user->kernel request/get-response */ 179 TASKSTATS_CMD_NEW, /* kernel->user event */ 180 __TASKSTATS_CMD_MAX, 181}; 182 183#define TASKSTATS_CMD_MAX (__TASKSTATS_CMD_MAX - 1) 184 185enum { 186 TASKSTATS_TYPE_UNSPEC = 0, /* Reserved */ 187 TASKSTATS_TYPE_PID, /* Process id */ 188 TASKSTATS_TYPE_TGID, /* Thread group id */ 189 TASKSTATS_TYPE_STATS, /* taskstats structure */ 190 TASKSTATS_TYPE_AGGR_PID, /* contains pid + stats */ 191 TASKSTATS_TYPE_AGGR_TGID, /* contains tgid + stats */ 192 TASKSTATS_TYPE_NULL, /* contains nothing */ 193 __TASKSTATS_TYPE_MAX, 194}; 195 196#define TASKSTATS_TYPE_MAX (__TASKSTATS_TYPE_MAX - 1) 197 198enum { 199 TASKSTATS_CMD_ATTR_UNSPEC = 0, 200 TASKSTATS_CMD_ATTR_PID, 201 TASKSTATS_CMD_ATTR_TGID, 202 TASKSTATS_CMD_ATTR_REGISTER_CPUMASK, 203 TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK, 204 __TASKSTATS_CMD_ATTR_MAX, 205}; 206 207#define TASKSTATS_CMD_ATTR_MAX (__TASKSTATS_CMD_ATTR_MAX - 1) 208 209/* NETLINK_GENERIC related info */ 210 211#define TASKSTATS_GENL_NAME "TASKSTATS" 212#define TASKSTATS_GENL_VERSION 0x1 213 214#endif /* _LINUX_TASKSTATS_H */ 215