linux/include/linux/taskstats.h
<<
>>
Prefs
   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       8
  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_NULL,            /* contains nothing */
 192        __TASKSTATS_TYPE_MAX,
 193};
 194
 195#define TASKSTATS_TYPE_MAX (__TASKSTATS_TYPE_MAX - 1)
 196
 197enum {
 198        TASKSTATS_CMD_ATTR_UNSPEC = 0,
 199        TASKSTATS_CMD_ATTR_PID,
 200        TASKSTATS_CMD_ATTR_TGID,
 201        TASKSTATS_CMD_ATTR_REGISTER_CPUMASK,
 202        TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK,
 203        __TASKSTATS_CMD_ATTR_MAX,
 204};
 205
 206#define TASKSTATS_CMD_ATTR_MAX (__TASKSTATS_CMD_ATTR_MAX - 1)
 207
 208/* NETLINK_GENERIC related info */
 209
 210#define TASKSTATS_GENL_NAME     "TASKSTATS"
 211#define TASKSTATS_GENL_VERSION  0x1
 212
 213#endif /* _LINUX_TASKSTATS_H */
 214
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.