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taskstats.h
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/* 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. */ #ifndef _LINUX_TASKSTATS_H #define _LINUX_TASKSTATS_H #include <linux/types.h> /* 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 8 #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, and AXSIG. */ __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 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 */ #define TASKSTATS_HAS_IO_ACCOUNTING /* Per-task storage I/O accounting starts */ __u64 read_bytes; /* bytes of read I/O */ __u64 write_bytes; /* bytes of write I/O */ __u64 cancelled_write_bytes; /* bytes of cancelled write I/O */ __u64 nvcsw; /* voluntary_ctxt_switches */ __u64 nivcsw; /* nonvoluntary_ctxt_switches */ /* time accounting for SMT machines */ __u64 ac_utimescaled; /* utime scaled on frequency etc */ __u64 ac_stimescaled; /* stime scaled on frequency etc */ __u64 cpu_scaled_run_real_total; /* scaled cpu_run_real_total */ /* Delay waiting for memory reclaim */ __u64 freepages_count; __u64 freepages_delay_total; }; /* * Commands sent from userspace * Not versioned. New commands should only be inserted at the enum's end * prior to __TASKSTATS_CMD_MAX */ enum { TASKSTATS_CMD_UNSPEC = 0, /* Reserved */ TASKSTATS_CMD_GET, /* user->kernel request/get-response */ TASKSTATS_CMD_NEW, /* kernel->user event */ __TASKSTATS_CMD_MAX, }; #define TASKSTATS_CMD_MAX (__TASKSTATS_CMD_MAX - 1) enum { TASKSTATS_TYPE_UNSPEC = 0, /* Reserved */ TASKSTATS_TYPE_PID, /* Process id */ TASKSTATS_TYPE_TGID, /* Thread group id */ TASKSTATS_TYPE_STATS, /* taskstats structure */ TASKSTATS_TYPE_AGGR_PID, /* contains pid + stats */ TASKSTATS_TYPE_AGGR_TGID, /* contains tgid + stats */ TASKSTATS_TYPE_NULL, /* contains nothing */ __TASKSTATS_TYPE_MAX, }; #define TASKSTATS_TYPE_MAX (__TASKSTATS_TYPE_MAX - 1) enum { TASKSTATS_CMD_ATTR_UNSPEC = 0, TASKSTATS_CMD_ATTR_PID, TASKSTATS_CMD_ATTR_TGID, TASKSTATS_CMD_ATTR_REGISTER_CPUMASK, TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK, __TASKSTATS_CMD_ATTR_MAX, }; #define TASKSTATS_CMD_ATTR_MAX (__TASKSTATS_CMD_ATTR_MAX - 1) /* NETLINK_GENERIC related info */ #define TASKSTATS_GENL_NAME "TASKSTATS" #define TASKSTATS_GENL_VERSION 0x1 #endif /* _LINUX_TASKSTATS_H */