/* SPDX-License-Identifier: LGPL-2.1 WITH Linux-syscall-note */ /* taskstats.h - exporting per-task statistics * * Copyright (C) Shailabh Nagar, IBM Corp. 2006 * (C) Balbir Singh, IBM Corp. 2006 * (C) Jay Lan, SGI, 2006 * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2.1 of the GNU Lesser General Public License * as published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
/* Format for per-task data returned to userland when * - a task exits * - listener requests stats for a task * * The struct is versioned. Newer versions should only add fields to * the bottom of the struct to maintain backward compatibility. * * * To add new fields * a) bump up TASKSTATS_VERSION * b) add comment indicating new version number at end of struct * c) add new fields after version comment; maintain 64-bit alignment
*/
#define TASKSTATS_VERSION 16 #define TS_COMM_LEN 32 /* should be >= TASK_COMM_LEN
* in linux/sched.h */
struct taskstats {
/* The version number of this struct. This field is always set to * TAKSTATS_VERSION, which is defined in <linux/taskstats.h>. * Each time the struct is changed, the value should be incremented.
*/
__u16 version;
__u32 ac_exitcode; /* Exit status */
/* The accounting flags of a task as defined in <linux/acct.h> * Defined values are AFORK, ASU, ACOMPAT, ACORE, AXSIG, and AGROUP. * (AGROUP since version 12).
*/
__u8 ac_flag; /* Record flags */
__u8 ac_nice; /* task_nice */
/* Delay accounting fields start * * All values, until comment "Delay accounting fields end" are * available only if delay accounting is enabled, even though the last * few fields are not delays * * xxx_count is the number of delay values recorded * xxx_delay_total is the corresponding cumulative delay in nanoseconds * * xxx_delay_total wraps around to zero on overflow * xxx_count incremented regardless of overflow
*/
/* Delay waiting for cpu, while runnable * count, delay_total NOT updated atomically
*/
__u64 cpu_count __attribute__((aligned(8)));
__u64 cpu_delay_total;
/* Following four fields atomically updated using task->delays->lock */
/* Delay waiting for synchronous block I/O to complete * does not account for delays in I/O submission
*/
__u64 blkio_count;
__u64 blkio_delay_total;
/* Delay waiting for page fault I/O (swap in only) */
__u64 swapin_count;
__u64 swapin_delay_total;
/* cpu "wall-clock" running time * On some architectures, value will adjust for cpu time stolen * from the kernel in involuntary waits due to virtualization. * Value is cumulative, in nanoseconds, without a corresponding count * and wraps around to zero silently on overflow
*/
__u64 cpu_run_real_total;
/* cpu "virtual" running time * Uses time intervals seen by the kernel i.e. no adjustment * for kernel's involuntary waits due to virtualization. * Value is cumulative, in nanoseconds, without a corresponding count * and wraps around to zero silently on overflow
*/
__u64 cpu_run_virtual_total; /* Delay accounting fields end */ /* version 1 ends here */
/* Basic Accounting Fields start */ char ac_comm[TS_COMM_LEN]; /* Command name */
__u8 ac_sched __attribute__((aligned(8))); /* Scheduling discipline */
__u8 ac_pad[3];
__u32 ac_uid __attribute__((aligned(8))); /* User ID */
__u32 ac_gid; /* Group ID */
__u32 ac_pid; /* Process ID */
__u32 ac_ppid; /* Parent process ID */ /* __u32 range means times from 1970 to 2106 */
__u32 ac_btime; /* Begin time [sec since 1970] */
__u64 ac_etime __attribute__((aligned(8))); /* Elapsed time [usec] */
__u64 ac_utime; /* User CPU time [usec] */
__u64 ac_stime; /* SYstem CPU time [usec] */
__u64 ac_minflt; /* Minor Page Fault Count */
__u64 ac_majflt; /* Major Page Fault Count */ /* Basic Accounting Fields end */
/* Extended accounting fields start */ /* Accumulated RSS usage in duration of a task, in MBytes-usecs. * The current rss usage is added to this counter every time * a tick is charged to a task's system time. So, at the end we * will have memory usage multiplied by system time. Thus an * average usage per system time unit can be calculated.
*/
__u64 coremem; /* accumulated RSS usage in MB-usec */ /* Accumulated virtual memory usage in duration of a task. * Same as acct_rss_mem1 above except that we keep track of VM usage.
*/
__u64 virtmem; /* accumulated VM usage in MB-usec */
/* High watermark of RSS and virtual memory usage in duration of * a task, in KBytes.
*/
__u64 hiwater_rss; /* High-watermark of RSS usage, in KB */
__u64 hiwater_vm; /* High-water VM usage, in KB */
/* The following four fields are I/O statistics of a task. */
__u64 read_char; /* bytes read */
__u64 write_char; /* bytes written */
__u64 read_syscalls; /* read syscalls */
__u64 write_syscalls; /* write syscalls */ /* Extended accounting fields end */
/* v12 begin */
__u32 ac_tgid; /* thread group ID */ /* Thread group walltime up to now. This is total process walltime if * AGROUP flag is set.
*/
__u64 ac_tgetime __attribute__((aligned(8))); /* Lightweight information to identify process binary files. * This leaves userspace to match this to a file system path, using * MAJOR() and MINOR() macros to identify a device and mount point, * the inode to identify the executable file. This is /proc/self/exe * at the end, so matching the most recent exec(). Values are zero * for kernel threads.
*/
__u64 ac_exe_dev; /* program binary device ID */
__u64 ac_exe_inode; /* program binary inode number */ /* v12 end */
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