include/uapi/linux/taskstats.h

   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       14
  38 #define TS_COMM_LEN             32      /* should be >= TASK_COMM_LEN
  39                                          * in linux/sched.h */
  40
  41 struct 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, AXSIG, and AGROUP.
  52          * (AGROUP since version 12).
  53          */
  54         __u8    ac_flag;                /* Record flags */
  55         __u8    ac_nice;                /* task_nice */
  56
  57         /* Delay accounting fields start
  58          *
  59          * All values, until comment "Delay accounting fields end" are
  60          * available only if delay accounting is enabled, even though the last
  61          * few fields are not delays
  62          *
  63          * xxx_count is the number of delay values recorded
  64          * xxx_delay_total is the corresponding cumulative delay in nanoseconds
  65          *
  66          * xxx_delay_total wraps around to zero on overflow
  67          * xxx_count incremented regardless of overflow
  68          */
  69
  70         /* Delay waiting for cpu, while runnable
  71          * count, delay_total NOT updated atomically
  72          */
  73         __u64   cpu_count __attribute__((aligned(8)));
  74         __u64   cpu_delay_total;
  75         __u64   cpu_delay_max;
  76         __u64   cpu_delay_min;
  77
  78         /* Following four fields atomically updated using task->delays->lock */
  79
  80         /* Delay waiting for synchronous block I/O to complete
  81          * does not account for delays in I/O submission
  82          */
  83         __u64   blkio_count;
  84         __u64   blkio_delay_total;
  85         __u64   blkio_delay_max;
  86         __u64   blkio_delay_min;
  87
  88         /* Delay waiting for page fault I/O (swap in only) */
  89         __u64   swapin_count;
  90         __u64   swapin_delay_total;
  91         __u64   swapin_delay_max;
  92         __u64   swapin_delay_min;
  93
  94         /* cpu "wall-clock" running time
  95          * On some architectures, value will adjust for cpu time stolen
  96          * from the kernel in 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_real_total;
 101
 102         /* cpu "virtual" running time
 103          * Uses time intervals seen by the kernel i.e. no adjustment
 104          * for kernel's involuntary waits due to virtualization.
 105          * Value is cumulative, in nanoseconds, without a corresponding count
 106          * and wraps around to zero silently on overflow
 107          */
 108         __u64   cpu_run_virtual_total;
 109         /* Delay accounting fields end */
 110         /* version 1 ends here */
 111
 112         /* Basic Accounting Fields start */
 113         char    ac_comm[TS_COMM_LEN];   /* Command name */
 114         __u8    ac_sched __attribute__((aligned(8)));
 115                                         /* Scheduling discipline */
 116         __u8    ac_pad[3];
 117         __u32   ac_uid __attribute__((aligned(8)));
 118                                         /* User ID */
 119         __u32   ac_gid;                 /* Group ID */
 120         __u32   ac_pid;                 /* Process ID */
 121         __u32   ac_ppid;                /* Parent process ID */
 122         /* __u32 range means times from 1970 to 2106 */
 123         __u32   ac_btime;               /* Begin time [sec since 1970] */
 124         __u64   ac_etime __attribute__((aligned(8)));
 125                                         /* Elapsed time [usec] */
 126         __u64   ac_utime;               /* User CPU time [usec] */
 127         __u64   ac_stime;               /* SYstem CPU time [usec] */
 128         __u64   ac_minflt;              /* Minor Page Fault Count */
 129         __u64   ac_majflt;              /* Major Page Fault Count */
 130         /* Basic Accounting Fields end */
 131
 132         /* Extended accounting fields start */
 133         /* Accumulated RSS usage in duration of a task, in MBytes-usecs.
 134          * The current rss usage is added to this counter every time
 135          * a tick is charged to a task's system time. So, at the end we
 136          * will have memory usage multiplied by system time. Thus an
 137          * average usage per system time unit can be calculated.
 138          */
 139         __u64   coremem;                /* accumulated RSS usage in MB-usec */
 140         /* Accumulated virtual memory usage in duration of a task.
 141          * Same as acct_rss_mem1 above except that we keep track of VM usage.
 142          */
 143         __u64   virtmem;                /* accumulated VM  usage in MB-usec */
 144
 145         /* High watermark of RSS and virtual memory usage in duration of
 146          * a task, in KBytes.
 147          */
 148         __u64   hiwater_rss;            /* High-watermark of RSS usage, in KB */
 149         __u64   hiwater_vm;             /* High-water VM usage, in KB */
 150
 151         /* The following four fields are I/O statistics of a task. */
 152         __u64   read_char;              /* bytes read */
 153         __u64   write_char;             /* bytes written */
 154         __u64   read_syscalls;          /* read syscalls */
 155         __u64   write_syscalls;         /* write syscalls */
 156         /* Extended accounting fields end */
 157
 158 #define TASKSTATS_HAS_IO_ACCOUNTING
 159         /* Per-task storage I/O accounting starts */
 160         __u64   read_bytes;             /* bytes of read I/O */
 161         __u64   write_bytes;            /* bytes of write I/O */
 162         __u64   cancelled_write_bytes;  /* bytes of cancelled write I/O */
 163
 164         __u64  nvcsw;                   /* voluntary_ctxt_switches */
 165         __u64  nivcsw;                  /* nonvoluntary_ctxt_switches */
 166
 167         /* time accounting for SMT machines */
 168         __u64   ac_utimescaled;         /* utime scaled on frequency etc */
 169         __u64   ac_stimescaled;         /* stime scaled on frequency etc */
 170         __u64   cpu_scaled_run_real_total; /* scaled cpu_run_real_total */
 171
 172         /* Delay waiting for memory reclaim */
 173         __u64   freepages_count;
 174         __u64   freepages_delay_total;
 175         __u64   freepages_delay_max;
 176         __u64   freepages_delay_min;
 177
 178         /* Delay waiting for thrashing page */
 179         __u64   thrashing_count;
 180         __u64   thrashing_delay_total;
 181         __u64   thrashing_delay_max;
 182         __u64   thrashing_delay_min;
 183
 184         /* v10: 64-bit btime to avoid overflow */
 185         __u64   ac_btime64;             /* 64-bit begin time */
 186
 187         /* v11: Delay waiting for memory compact */
 188         __u64   compact_count;
 189         __u64   compact_delay_total;
 190         __u64   compact_delay_max;
 191         __u64   compact_delay_min;
 192
 193         /* v12 begin */
 194         __u32   ac_tgid;        /* thread group ID */
 195         /* Thread group walltime up to now. This is total process walltime if
 196          * AGROUP flag is set.
 197          */
 198         __u64   ac_tgetime __attribute__((aligned(8)));
 199         /* Lightweight information to identify process binary files.
 200          * This leaves userspace to match this to a file system path, using
 201          * MAJOR() and MINOR() macros to identify a device and mount point,
 202          * the inode to identify the executable file. This is /proc/self/exe
 203          * at the end, so matching the most recent exec(). Values are zero
 204          * for kernel threads.
 205          */
 206         __u64   ac_exe_dev;     /* program binary device ID */
 207         __u64   ac_exe_inode;   /* program binary inode number */
 208         /* v12 end */
 209
 210         /* v13: Delay waiting for write-protect copy */
 211         __u64    wpcopy_count;
 212         __u64    wpcopy_delay_total;
 213         __u64    wpcopy_delay_max;
 214         __u64    wpcopy_delay_min;
 215
 216         /* v14: Delay waiting for IRQ/SOFTIRQ */
 217         __u64    irq_count;
 218         __u64    irq_delay_total;
 219         __u64    irq_delay_max;
 220         __u64    irq_delay_min;
 221         /* v15: add Delay max */
 222 };
 223
 224
 225 /*
 226  * Commands sent from userspace
 227  * Not versioned. New commands should only be inserted at the enum's end
 228  * prior to __TASKSTATS_CMD_MAX
 229  */
 230
 231 enum {
 232         TASKSTATS_CMD_UNSPEC = 0,       /* Reserved */
 233         TASKSTATS_CMD_GET,              /* user->kernel request/get-response */
 234         TASKSTATS_CMD_NEW,              /* kernel->user event */
 235         __TASKSTATS_CMD_MAX,
 236 };
 237
 238 #define TASKSTATS_CMD_MAX (__TASKSTATS_CMD_MAX - 1)
 239
 240 enum {
 241         TASKSTATS_TYPE_UNSPEC = 0,      /* Reserved */
 242         TASKSTATS_TYPE_PID,             /* Process id */
 243         TASKSTATS_TYPE_TGID,            /* Thread group id */
 244         TASKSTATS_TYPE_STATS,           /* taskstats structure */
 245         TASKSTATS_TYPE_AGGR_PID,        /* contains pid + stats */
 246         TASKSTATS_TYPE_AGGR_TGID,       /* contains tgid + stats */
 247         TASKSTATS_TYPE_NULL,            /* contains nothing */
 248         __TASKSTATS_TYPE_MAX,
 249 };
 250
 251 #define TASKSTATS_TYPE_MAX (__TASKSTATS_TYPE_MAX - 1)
 252
 253 enum {
 254         TASKSTATS_CMD_ATTR_UNSPEC = 0,
 255         TASKSTATS_CMD_ATTR_PID,
 256         TASKSTATS_CMD_ATTR_TGID,
 257         TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
 258         TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
 259         __TASKSTATS_CMD_ATTR_MAX,
 260 };
 261
 262 #define TASKSTATS_CMD_ATTR_MAX (__TASKSTATS_CMD_ATTR_MAX - 1)
 263
 264 /* NETLINK_GENERIC related info */
 265
 266 #define TASKSTATS_GENL_NAME     "TASKSTATS"
 267 #define TASKSTATS_GENL_VERSION  0x1
 268
 269 #endif /* _LINUX_TASKSTATS_H */