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taskstats: add context-switch counters

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Make available to the user the following task and process performance
statistics:

	* Involuntary Context Switches (task_struct->nivcsw)
	* Voluntary Context Switches (task_struct->nvcsw)

Statistics information is available from:
	1. taskstats interface (Documentation/accounting/)
	2. /proc/PID/status (task only).

This data is useful for detecting hyperactivity patterns between processes.

[akpm@linux-foundation.org: cleanup]
Signed-off-by: Maxim Uvarov <muvarov@ru.mvista.com>
Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Jay Lan <jlan@engr.sgi.com>
Cc: Jonathan Lim <jlim@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Maxim Uvarov 2007-07-15 23:40:48 -07:00 • committed by Linus Torvalds
parent a6c15c2b0f
commit b663a79c19
5 changed files with 41 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

10
fs/proc/array.c
View file

@ -289,6 +289,15 @@ static inline char *task_cap(struct task_struct *p, char *buffer)
cap_t(p->cap_effective));
}
static inline char *task_context_switch_counts(struct task_struct *p,
char *buffer)
{
return buffer + sprintf(buffer, "voluntary_ctxt_switches:\t%lu\n"
"nonvoluntary_ctxt_switches:\t%lu\n",
p->nvcsw,
p->nivcsw);
}
int proc_pid_status(struct task_struct *task, char * buffer)
{
char * orig = buffer;
@ -307,6 +316,7 @@ int proc_pid_status(struct task_struct *task, char * buffer)
#if defined(CONFIG_S390)
buffer = task_show_regs(task, buffer);
#endif
buffer = task_context_switch_counts(task, buffer);
return buffer - orig;
}