linux-kernel - Re: [PATCH] include children count, in Threads: field present in /proc/<pid>/status (take-1)

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Message-Id: <EE7C757E-E2CE-4617-A1D4-3B8F5E3E8240@gmail.com>
Date:	Sat, 30 Sep 2006 01:51:31 +0900
From:	girish <girishvg@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	William Pitcock <nenolod@...eme.org>, girishvg@...il.com
Subject: Re: [PATCH] include children count, in Threads: field present in /proc/<pid>/status (take-1)


On Sep 30, 2006, at 1:31 AM, William Pitcock wrote:

>
> On Sep 29, 2006, at 10:18 AM, girish wrote:
>
>>
>> -	buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
>> +	buffer += sprintf(buffer, "Threads:\t%d\n", num_threads +  
>> num_children);
>
> Personally, I'd prefer the children count to be separate, something  
> like:
>
> buffer += sprintf(buffer, "Threads:\t%d (%d children, %d total)",  
> num_threads, num_children, num_threads + num_children);
>
> That would be rather nice, indeed.
>
> Also, next time, make sure that linux-kernel is CC'd, not BCC'd.
>
> ---
> William Pitcock
> nenolod@...eme.org
> http://people.atheme.org/~nenolod/
> http://nenolod.net
>
>

Agree.  It indeed look better. I too had an awk script in mind, to  
parse the line.  I ended up removing such formatting, because not all  
process spawn child thread(s), showing num_children count as zero.  
That looked bit odd. So here it is again - new wine.

Thanks.

Signed-off-by: Girish V. Gulawani <girishvg@...il.com>
--- linux-vanilla/fs/proc/array.c	2006-09-20 12:42:06.000000000 +0900
+++ linux/fs/proc/array.c	2006-09-30 01:47:25.000000000 +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 +270,14 @@ 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);
+	buffer += sprintf(buffer, "Threads:\t%d", num_threads);
+	if (num_children)
+		buffer += sprintf(buffer, " (%d children, %d total)",  
num_children, num_threads + num_children);
+	buffer += sprintf(buffer, "\n");
  	buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim);

  	/* render them all */
-
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