1/* taskstats.h - exporting per-task statistics 2 * 3 * Copyright (C) Shailabh Nagar, IBM Corp. 2006 4 * (C) Balbir Singh, IBM Corp. 2006 5 * (C) Jay Lan, SGI, 2006 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of version 2.1 of the GNU Lesser General Public License 9 * as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it would be useful, but 12 * WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 14 */ 15 16#ifndef _LINUX_TASKSTATS_H 17#define _LINUX_TASKSTATS_H 18 19#include <linux/types.h> 20 21/* Format for per-task data returned to userland when 22 * - a task exits 23 * - listener requests stats for a task 24 * 25 * The struct is versioned. Newer versions should only add fields to 26 * the bottom of the struct to maintain backward compatibility. 27 * 28 * 29 * To add new fields 30 * a) bump up TASKSTATS_VERSION 31 * b) add comment indicating new version number at end of struct 32 * c) add new fields after version comment; maintain 64-bit alignment 33 */ 34 35 36#define TASKSTATS_VERSION 7 37#define TS_COMM_LEN 32 /* should be >= TASK_COMM_LEN 38 * in linux/sched.h */ 39 40struct taskstats { 41 42 /* The version number of this struct. This field is always set to 43 * TAKSTATS_VERSION, which is defined in <linux/taskstats.h>. 44 * Each time the struct is changed, the value should be incremented. 45 */ 46 __u16 version; 47 __u32 ac_exitcode; /* Exit status */ 48 49 /* The accounting flags of a task as defined in <linux/acct.h> 50 * Defined values are AFORK, ASU, ACOMPAT, ACORE, and AXSIG. 51 */ 52 __u8 ac_flag; /* Record flags */ 53 __u8 ac_nice; /* task_nice */ 54 55 /* Delay accounting fields start 56 * 57 * All values, until comment "Delay accounting fields end" are 58 * available only if delay accounting is enabled, even though the last 59 * few fields are not delays 60 * 61 * xxx_count is the number of delay values recorded 62 * xxx_delay_total is the corresponding cumulative delay in nanoseconds 63 * 64 * xxx_delay_total wraps around to zero on overflow 65 * xxx_count incremented regardless of overflow 66 */ 67 68 /* Delay waiting for cpu, while runnable 69 * count, delay_total NOT updated atomically 70 */ 71 __u64 cpu_count __attribute__((aligned(8))); 72 __u64 cpu_delay_total; 73 74 /* Following four fields atomically updated using task->delays->lock */ 75 76 /* Delay waiting for synchronous block I/O to complete 77 * does not account for delays in I/O submission 78 */ 79 __u64 blkio_count; 80 __u64 blkio_delay_total; 81 82 /* Delay waiting for page fault I/O (swap in only) */ 83 __u64 swapin_count; 84 __u64 swapin_delay_total; 85 86 /* cpu "wall-clock" running time 87 * On some architectures, value will adjust for cpu time stolen 88 * from the kernel in involuntary waits due to virtualization. 89 * Value is cumulative, in nanoseconds, without a corresponding count 90 * and wraps around to zero silently on overflow 91 */ 92 __u64 cpu_run_real_total; 93 94 /* cpu "virtual" running time 95 * Uses time intervals seen by the kernel i.e. no adjustment 96 * for kernel's involuntary waits due to virtualization. 97 * Value is cumulative, in nanoseconds, without a corresponding count 98 * and wraps around to zero silently on overflow 99 */ 100 __u64 cpu_run_virtual_total; 101 /* Delay accounting fields end */ 102 /* version 1 ends here */ 103 104 /* Basic Accounting Fields start */ 105 char ac_comm[TS_COMM_LEN]; /* Command name */ 106 __u8 ac_sched __attribute__((aligned(8))); 107 /* Scheduling discipline */ 108 __u8 ac_pad[3]; 109 __u32 ac_uid __attribute__((aligned(8))); 110 /* User ID */ 111 __u32 ac_gid; /* Group ID */ 112 __u32 ac_pid; /* Process ID */ 113 __u32 ac_ppid; /* Parent process ID */ 114 __u32 ac_btime; /* Begin time [sec since 1970] */ 115 __u64 ac_etime __attribute__((aligned(8))); 116 /* Elapsed time [usec] */ 117 __u64 ac_utime; /* User CPU time [usec] */ 118 __u64 ac_stime; /* SYstem CPU time [usec] */ 119 __u64 ac_minflt; /* Minor Page Fault Count */ 120 __u64 ac_majflt; /* Major Page Fault Count */ 121 /* Basic Accounting Fields end */ 122 123 /* Extended accounting fields start */ 124 /* Accumulated RSS usage in duration of a task, in MBytes-usecs. 125 * The current rss usage is added to this counter every time 126 * a tick is charged to a task's system time. So, at the end we 127 * will have memory usage multiplied by system time. Thus an 128 * average usage per system time unit can be calculated. 129 */ 130 __u64 coremem; /* accumulated RSS usage in MB-usec */ 131 /* Accumulated virtual memory usage in duration of a task. 132 * Same as acct_rss_mem1 above except that we keep track of VM usage. 133 */ 134 __u64 virtmem; /* accumulated VM usage in MB-usec */ 135 136 /* High watermark of RSS and virtual memory usage in duration of 137 * a task, in KBytes. 138 */ 139 __u64 hiwater_rss; /* High-watermark of RSS usage, in KB */ 140 __u64 hiwater_vm; /* High-water VM usage, in KB */ 141 142 /* The following four fields are I/O statistics of a task. */ 143 __u64 read_char; /* bytes read */ 144 __u64 write_char; /* bytes written */ 145 __u64 read_syscalls; /* read syscalls */ 146 __u64 write_syscalls; /* write syscalls */ 147 /* Extended accounting fields end */ 148 149#define TASKSTATS_HAS_IO_ACCOUNTING 150 /* Per-task storage I/O accounting starts */ 151 __u64 read_bytes; /* bytes of read I/O */ 152 __u64 write_bytes; /* bytes of write I/O */ 153 __u64 cancelled_write_bytes; /* bytes of cancelled write I/O */ 154 155 __u64 nvcsw; /* voluntary_ctxt_switches */ 156 __u64 nivcsw; /* nonvoluntary_ctxt_switches */ 157 158 /* time accounting for SMT machines */ 159 __u64 ac_utimescaled; /* utime scaled on frequency etc */ 160 __u64 ac_stimescaled; /* stime scaled on frequency etc */ 161 __u64 cpu_scaled_run_real_total; /* scaled cpu_run_real_total */ 162 163 /* Delay waiting for memory reclaim */ 164 __u64 freepages_count; 165 __u64 freepages_delay_total; 166}; 167 168 169/* 170 * Commands sent from userspace 171 * Not versioned. New commands should only be inserted at the enum's end 172 * prior to __TASKSTATS_CMD_MAX 173 */ 174 175enum { 176 TASKSTATS_CMD_UNSPEC = 0, /* Reserved */ 177 TASKSTATS_CMD_GET, /* user->kernel request/get-response */ 178 TASKSTATS_CMD_NEW, /* kernel->user event */ 179 __TASKSTATS_CMD_MAX, 180}; 181 182#define TASKSTATS_CMD_MAX (__TASKSTATS_CMD_MAX - 1) 183 184enum { 185 TASKSTATS_TYPE_UNSPEC = 0, /* Reserved */ 186 TASKSTATS_TYPE_PID, /* Process id */ 187 TASKSTATS_TYPE_TGID, /* Thread group id */ 188 TASKSTATS_TYPE_STATS, /* taskstats structure */ 189 TASKSTATS_TYPE_AGGR_PID, /* contains pid + stats */ 190 TASKSTATS_TYPE_AGGR_TGID, /* contains tgid + stats */ 191 __TASKSTATS_TYPE_MAX, 192}; 193 194#define TASKSTATS_TYPE_MAX (__TASKSTATS_TYPE_MAX - 1) 195 196enum { 197 TASKSTATS_CMD_ATTR_UNSPEC = 0, 198 TASKSTATS_CMD_ATTR_PID, 199 TASKSTATS_CMD_ATTR_TGID, 200 TASKSTATS_CMD_ATTR_REGISTER_CPUMASK, 201 TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK, 202 __TASKSTATS_CMD_ATTR_MAX, 203}; 204 205#define TASKSTATS_CMD_ATTR_MAX (__TASKSTATS_CMD_ATTR_MAX - 1) 206 207/* NETLINK_GENERIC related info */ 208 209#define TASKSTATS_GENL_NAME "TASKSTATS" 210#define TASKSTATS_GENL_VERSION 0x1 211 212#endif /* _LINUX_TASKSTATS_H */ 213