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/* taskstats.h - exporting per-task statistics
*
* Copyright (C) Shailabh Nagar, IBM Corp. 2006
* (C) Balbir Singh, IBM Corp. 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
/* 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 1
struct taskstats {
/* Version 1 */
__u16 version;
__u16 padding[3]; /* Userspace should not interpret the padding
* field which can be replaced by useful
* fields if struct taskstats is extended.
*/
/* 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;
__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 */
};
#define TASKSTATS_LISTEN_GROUP 0x1
/*
* 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_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_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 */
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