From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <owner-linux-mm@kvack.org>
Received: from mail6.bemta8.messagelabs.com (mail6.bemta8.messagelabs.com [216.82.243.55])
	by kanga.kvack.org (Postfix) with ESMTP id F080E6B0012
	for <linux-mm@kvack.org>; Thu, 16 Jun 2011 09:53:30 -0400 (EDT)
Date: Thu, 16 Jun 2011 15:51:14 +0200
From: Oleg Nesterov <oleg@redhat.com>
Subject: Re: [PATCH v4 3.0-rc2-tip 4/22]  4: Uprobes: register/unregister
	probes.
Message-ID: <20110616135114.GA22131@redhat.com>
References: <20110607125804.28590.92092.sendpatchset@localhost6.localdomain6> <20110607125900.28590.16071.sendpatchset@localhost6.localdomain6> <1308159719.2171.57.camel@laptop> <20110616041137.GG4952@linux.vnet.ibm.com> <1308217582.15315.94.camel@twins> <20110616095412.GK4952@linux.vnet.ibm.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20110616095412.GK4952@linux.vnet.ibm.com>
Sender: owner-linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>, Linux-mm <linux-mm@kvack.org>, Arnaldo Carvalho de Melo <acme@infradead.org>, Linus Torvalds <torvalds@linux-foundation.org>, Ananth N Mavinakayanahalli <ananth@in.ibm.com>, Hugh Dickins <hughd@google.com>, Christoph Hellwig <hch@infradead.org>, Jonathan Corbet <corbet@lwn.net>, Thomas Gleixner <tglx@linutronix.de>, Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>, Andrew Morton <akpm@linux-foundation.org>, Jim Keniston <jkenisto@linux.vnet.ibm.com>, Roland McGrath <roland@hack.frob.com>, Andi Kleen <andi@firstfloor.org>, LKML <linux-kernel@vger.kernel.org>

On 06/16, Srikar Dronamraju wrote:
>
> In which case, shouldnt traversing all the tasks of all siblings of
> parent of mm->owner should provide us all the the tasks that have linked
> to mm. Right?

I don't think so.

Even if the initial mm->ovner never exits (iow, mm->owner is never changed),
the "deep" CLONE_VM child can be reparented to init if its parent exits.

> Agree that we can bother about this a little later.

Agreed.


Oh. We should move ->mm from task_struct to signal_struct, but we need to
change the code like get_task_mm(). And then instead of mm->owner we can
have mm->processes list. Perhaps. This can be used by zap_threads() too.

Oleg.

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>