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