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