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001: /* taskstats.h - exporting per-task statistics
002:  *
003:  * Copyright (C) Shailabh Nagar, IBM Corp. 2006
004:  *           (C) Balbir Singh,   IBM Corp. 2006
005:  *           (C) Jay Lan,        SGI, 2006
006:  *
007:  * This program is free software; you can redistribute it and/or modify it
008:  * under the terms of version 2.1 of the GNU Lesser General Public License
009:  * as published by the Free Software Foundation.
010:  *
011:  * This program is distributed in the hope that it would be useful, but
012:  * WITHOUT ANY WARRANTY; without even the implied warranty of
013:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
014:  */
015: 
016: #ifndef _LINUX_TASKSTATS_H
017: #define _LINUX_TASKSTATS_H
018: 
019: #include <linux/types.h>
020: 
021: /* Format for per-task data returned to userland when
022:  *      - a task exits
023:  *      - listener requests stats for a task
024:  *
025:  * The struct is versioned. Newer versions should only add fields to
026:  * the bottom of the struct to maintain backward compatibility.
027:  *
028:  *
029:  * To add new fields
030:  *      a) bump up TASKSTATS_VERSION
031:  *      b) add comment indicating new version number at end of struct
032:  *      c) add new fields after version comment; maintain 64-bit alignment
033:  */
034: 
035: 
036: #define TASKSTATS_VERSION       8
037: #define TS_COMM_LEN             32      /* should be >= TASK_COMM_LEN
038:                                          * in linux/sched.h */
039: 
040: struct taskstats {
041: 
042:         /* The version number of this struct. This field is always set to
043:          * TAKSTATS_VERSION, which is defined in <linux/taskstats.h>.
044:          * Each time the struct is changed, the value should be incremented.
045:          */
046:         __u16   version;
047:         __u32   ac_exitcode;            /* Exit status */
048: 
049:         /* The accounting flags of a task as defined in <linux/acct.h>
050:          * Defined values are AFORK, ASU, ACOMPAT, ACORE, and AXSIG.
051:          */
052:         __u8    ac_flag;                /* Record flags */
053:         __u8    ac_nice;                /* task_nice */
054: 
055:         /* Delay accounting fields start
056:          *
057:          * All values, until comment "Delay accounting fields end" are
058:          * available only if delay accounting is enabled, even though the last
059:          * few fields are not delays
060:          *
061:          * xxx_count is the number of delay values recorded
062:          * xxx_delay_total is the corresponding cumulative delay in nanoseconds
063:          *
064:          * xxx_delay_total wraps around to zero on overflow
065:          * xxx_count incremented regardless of overflow
066:          */
067: 
068:         /* Delay waiting for cpu, while runnable
069:          * count, delay_total NOT updated atomically
070:          */
071:         __u64   cpu_count __attribute__((aligned(8)));
072:         __u64   cpu_delay_total;
073: 
074:         /* Following four fields atomically updated using task->delays->lock */
075: 
076:         /* Delay waiting for synchronous block I/O to complete
077:          * does not account for delays in I/O submission
078:          */
079:         __u64   blkio_count;
080:         __u64   blkio_delay_total;
081: 
082:         /* Delay waiting for page fault I/O (swap in only) */
083:         __u64   swapin_count;
084:         __u64   swapin_delay_total;
085: 
086:         /* cpu "wall-clock" running time
087:          * On some architectures, value will adjust for cpu time stolen
088:          * from the kernel in involuntary waits due to virtualization.
089:          * Value is cumulative, in nanoseconds, without a corresponding count
090:          * and wraps around to zero silently on overflow
091:          */
092:         __u64   cpu_run_real_total;
093: 
094:         /* cpu "virtual" running time
095:          * Uses time intervals seen by the kernel i.e. no adjustment
096:          * for kernel's involuntary waits due to virtualization.
097:          * Value is cumulative, in nanoseconds, without a corresponding count
098:          * and wraps around to zero silently on overflow
099:          */
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: 
175: enum {
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: 
184: enum {
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: 
197: enum {
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: 

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