Commit db5fed26 authored by Jay Lan's avatar Jay Lan Committed by Linus Torvalds
Browse files

[PATCH] csa accounting taskstats update 



ChangeLog:
   Feedbacks from Andrew Morton:
   - define TS_COMM_LEN to 32
   - change acct_stimexpd field of task_struct to be of
     cputime_t, which is to be used to save the tsk->stime
     of last timer interrupt update.
   - a new Documentation/accounting/taskstats-struct.txt
     to describe fields of taskstats struct.

   Feedback from Balbir Singh:
   - keep the stime of a task to be zero when both stime
     and utime are zero as recoreded in task_struct.

   Misc:
   - convert accumulated RSS/VM from platform dependent
     pages-ticks to MBytes-usecs in the kernel

Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Jes Sorensen <jes@sgi.com>
Cc: Chris Sturtivant <csturtiv@sgi.com>
Cc: Tony Ernst <tee@sgi.com>
Cc: Guillaume Thouvenin <guillaume.thouvenin@bull.net>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 8f0ab514

Documentation/accounting/taskstats-struct.txt

0 → 100644
+161 −0
Original line number Diff line number Diff line 
The struct taskstats

--------------------



This document contains an explanation of the struct taskstats fields.



There are three different groups of fields in the struct taskstats:



1) Common and basic accounting fields

    If CONFIG_TASKSTATS is set, the taskstats inteface is enabled and

    the common fields and basic accounting fields are collected for

    delivery at do_exit() of a task.

2) Delay accounting fields

    These fields are placed between

    /* Delay accounting fields start */

    and

    /* Delay accounting fields end */

    Their values are collected if CONFIG_TASK_DELAY_ACCT is set.

3) Extended accounting fields

    These fields are placed between

    /* Extended accounting fields start */

    and

    /* Extended accounting fields end */

    Their values are collected if CONFIG_TASK_XACCT is set.



Future extension should add fields to the end of the taskstats struct, and

should not change the relative position of each field within the struct.





struct taskstats {



1) Common and basic accounting fields:

	/* 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;



  	/* The exit code of a task. */

	__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 */



  	/* The value of task_nice() of a task. */

	__u8	ac_nice;		/* task_nice */



  	/* The name of the command that started this task. */

	char	ac_comm[TS_COMM_LEN];	/* Command name */



  	/* The scheduling discipline as set in task->policy field. */

	__u8	ac_sched;		/* Scheduling discipline */



	__u8	ac_pad[3];

	__u32	ac_uid;			/* User ID */

	__u32	ac_gid;			/* Group ID */

	__u32	ac_pid;			/* Process ID */

	__u32	ac_ppid;		/* Parent process ID */



  	/* The time when a task begins, in [secs] since 1970. */

	__u32	ac_btime;		/* Begin time [sec since 1970] */



  	/* The elapsed time of a task, in [usec]. */

	__u64	ac_etime;		/* Elapsed time [usec] */



  	/* The user CPU time of a task, in [usec]. */

	__u64	ac_utime;		/* User CPU time [usec] */



  	/* The system CPU time of a task, in [usec]. */

	__u64	ac_stime;		/* System CPU time [usec] */



  	/* The minor page fault count of a task, as set in task->min_flt. */

	__u64	ac_minflt;		/* Minor Page Fault Count */



	/* The major page fault count of a task, as set in task->maj_flt. */

	__u64	ac_majflt;		/* Major Page Fault Count */





2) Delay accounting fields:

	/* Delay accounting fields start

	 *

	 * All values, until the 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 */





3) Extended accounting fields

	/* 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 usage in duration of a task, in KBytes. */

	__u64	hiwater_rss;		/* High-watermark of RSS usage */



  	/* High watermark of VM  usage in duration of a task, in KBytes. */

	__u64	hiwater_vm;		/* High-water virtual memory usage */



	/* 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 */



}

include/linux/sched.h

+1 −1
Original line number Diff line number Diff line
@@ -984,7 +984,7 @@ struct task_struct { 
#if defined(CONFIG_TASK_XACCT)

	u64 acct_rss_mem1;	/* accumulated rss usage */

	u64 acct_vm_mem1;	/* accumulated virtual memory usage */

	clock_t acct_stimexpd;	/* clock_t-converted stime since last update */

	cputime_t acct_stimexpd;/* stime since last update */

#endif

#ifdef CONFIG_NUMA

  	struct mempolicy *mempolicy;

include/linux/taskstats.h

+31 −9
Original line number Diff line number Diff line
@@ -32,14 +32,21 @@ 




#define TASKSTATS_VERSION	2

#define TS_COMM_LEN		16	/* should sync up with TASK_COMM_LEN

#define TS_COMM_LEN		32	/* should be >= TASK_COMM_LEN

					 * in linux/sched.h */



struct taskstats {



	/* Version 1 */

	/* 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 */
@@ -104,15 +111,30 @@ struct taskstats { 
	__u64	ac_etime;		/* Elapsed time [usec] */

	__u64	ac_utime;		/* User CPU time [usec] */

	__u64	ac_stime;		/* SYstem CPU time [usec] */

	__u64	ac_minflt;		/* Minor Page Fault */

	__u64	ac_majflt;		/* Major Page Fault */

	__u64	ac_minflt;		/* Minor Page Fault Count */

	__u64	ac_majflt;		/* Major Page Fault Count */

	/* Basic Accounting Fields end */



 	/* Extended accounting fields start */

 	__u64	acct_rss_mem1;		/* accumulated rss usage */

 	__u64	acct_vm_mem1;		/* accumulated virtual memory usage */

 	__u64	hiwater_rss;		/* High-watermark of RSS usage */

 	__u64	hiwater_vm;		/* High-water virtual memory usage */

	/* 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 */

kernel/tsacct.c

+14 −11
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <linux/sched.h>

#include <linux/tsacct_kern.h>

#include <linux/acct.h>

#include <linux/jiffies.h>





#define USEC_PER_TICK	(USEC_PER_SEC/HZ)
@@ -62,33 +63,35 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk) 
	stats->ac_stime	 = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC;

	stats->ac_minflt = tsk->min_flt;

	stats->ac_majflt = tsk->maj_flt;

	/* Each process gets a minimum of one usec cpu time */

	if ((stats->ac_utime == 0) && (stats->ac_stime == 0)) {

		stats->ac_stime = 1;

	}



	strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));

}





#ifdef CONFIG_TASK_XACCT



#define KB 1024

#define MB (1024*KB)

/*

 * fill in extended accounting fields

 */

void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)

{

	stats->acct_rss_mem1 = p->acct_rss_mem1;

	stats->acct_vm_mem1  = p->acct_vm_mem1;

	/* convert pages-jiffies to Mbyte-usec */

	stats->coremem = jiffies_to_usecs(p->acct_rss_mem1) * PAGE_SIZE / MB;

	stats->virtmem = jiffies_to_usecs(p->acct_vm_mem1) * PAGE_SIZE / MB;

	if (p->mm) {

		stats->hiwater_rss   = p->mm->hiwater_rss;

		stats->hiwater_vm    = p->mm->hiwater_vm;

		/* adjust to KB unit */

		stats->hiwater_rss   = p->mm->hiwater_rss * PAGE_SIZE / KB;

		stats->hiwater_vm    = p->mm->hiwater_vm * PAGE_SIZE / KB;

	}

	stats->read_char	= p->rchar;

	stats->write_char	= p->wchar;

	stats->read_syscalls	= p->syscr;

	stats->write_syscalls	= p->syscw;

}



#undef KB

#undef MB



/**

 * acct_update_integrals - update mm integral fields in task_struct
@@ -97,8 +100,8 @@ void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) 
void acct_update_integrals(struct task_struct *tsk)

{

	if (likely(tsk->mm)) {

		long delta =

			cputime_to_jiffies(tsk->stime) - tsk->acct_stimexpd;

		long delta = cputime_to_jiffies(

			cputime_sub(tsk->stime, tsk->acct_stimexpd));



		if (delta == 0)

			return;

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