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Commit 5650b736 authored by Matt Helsley's avatar Matt Helsley Committed by Linus Torvalds
Browse files

[PATCH] Add timestamp field to process events 



This adds a timestamp field to the events sent via the process event
connector.  The timestamp allows listeners to accurately account the
duration(s) between a process' events and offers strong means with which
to determine the order of events with respect to a given task while also
avoiding the addition of per-task data.

This alters the size and layout of the event structure and hence would
break compatibility if process events connector as it stands in 2.6.15-rc2
were released as a mainline kernel.

Signed-off-by: default avatarMatt Helsley <matthltc@us.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 64123fd4

drivers/connector/cn_proc.c

+5 −0
Original line number Diff line number Diff line
@@ -56,6 +56,7 @@ void proc_fork_connector(struct task_struct *task) 
	msg = (struct cn_msg*)buffer;

	ev = (struct proc_event*)msg->data;

	get_seq(&msg->seq, &ev->cpu);

	getnstimestamp(&ev->timestamp);

	ev->what = PROC_EVENT_FORK;

	ev->event_data.fork.parent_pid = task->real_parent->pid;

	ev->event_data.fork.parent_tgid = task->real_parent->tgid;
@@ -81,6 +82,7 @@ void proc_exec_connector(struct task_struct *task) 
	msg = (struct cn_msg*)buffer;

	ev = (struct proc_event*)msg->data;

	get_seq(&msg->seq, &ev->cpu);

	getnstimestamp(&ev->timestamp);

	ev->what = PROC_EVENT_EXEC;

	ev->event_data.exec.process_pid = task->pid;

	ev->event_data.exec.process_tgid = task->tgid;
@@ -114,6 +116,7 @@ void proc_id_connector(struct task_struct *task, int which_id) 
	} else

	     	return;

	get_seq(&msg->seq, &ev->cpu);

	getnstimestamp(&ev->timestamp);



	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));

	msg->ack = 0; /* not used */
@@ -133,6 +136,7 @@ void proc_exit_connector(struct task_struct *task) 
	msg = (struct cn_msg*)buffer;

	ev = (struct proc_event*)msg->data;

	get_seq(&msg->seq, &ev->cpu);

	getnstimestamp(&ev->timestamp);

	ev->what = PROC_EVENT_EXIT;

	ev->event_data.exit.process_pid = task->pid;

	ev->event_data.exit.process_tgid = task->tgid;
@@ -165,6 +169,7 @@ static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack) 
	msg = (struct cn_msg*)buffer;

	ev = (struct proc_event*)msg->data;

	msg->seq = rcvd_seq;

	getnstimestamp(&ev->timestamp);

	ev->cpu = -1;

	ev->what = PROC_EVENT_NONE;

	ev->event_data.ack.err = err;

include/linux/cn_proc.h

+2 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#define CN_PROC_H



#include <linux/types.h>

#include <linux/time.h>

#include <linux/connector.h>



/*
@@ -65,6 +66,7 @@ struct proc_event { 
		PROC_EVENT_EXIT = 0x80000000

	} what;

	__u32 cpu;

	struct timespec timestamp;

	union { /* must be last field of proc_event struct */

		struct {

			__u32 err;