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[PATCH] Add timestamp field to process events

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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: Matt Helsley <matthltc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Matt Helsley 2005-12-12 00:37:10 -08:00 committed by Linus Torvalds
parent 64123fd42c
commit 5650b736ad
2 changed files with 7 additions and 0 deletions
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5
drivers/connector/cn_proc.c
View File

@ -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;

2
include/linux/cn_proc.h
View File

@ -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;