Re: [PATCH] include children count, in Threads: field present in /proc/<pid>/status (take-3)

[Eric W. Biederman]

This conflicts with the /proc changes in -mm.
Where we have manged to remove the use of the tasklist_lock.

The information in Children: is racy as it may change immediately
after you drop the lock.

Why is it interesting to report this information?
A process that cares can keep track of this in user space?

Eric

> Signed-off-by: Girish V. Gulawani <girishvg@xxxxxxxxx>
>
> --- linux-vanilla/fs/proc/array.c	2006-09-20 12:42:06.000000000 +0900
> +++ linux/fs/proc/array.c	2006-09-30 03:18:28.000000000 +0900
> @@ -248,6 +248,8 @@ static inline char * task_sig(struct tas
>  	int num_threads = 0;
>  	unsigned long qsize = 0;
>  	unsigned long qlim = 0;
> +	int num_children = 0;
> +	struct list_head *_p;
>
>  	sigemptyset(&pending);
>  	sigemptyset(&shpending);
> @@ -268,9 +270,13 @@ static inline char * task_sig(struct tas
>  		qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
>  		spin_unlock_irq(&p->sighand->siglock);
>  	}
> +	list_for_each(_p, &p->children)
> +		++num_children;
>  	read_unlock(&tasklist_lock);
>
>  	buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
> +	if (num_children)
> +		buffer += sprintf(buffer, "Children:\t%d\nTotal:\t%d\n",
> num_children, num_threads + num_children);
>  	buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim);
>
>  	/* render them all */
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/