linux-kernel - Re: [PATCH v4 3.0-rc2-tip 4/22] 4: Uprobes: register/unregister probes.

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Message-ID: <20110617092951.GA16985@linux.vnet.ibm.com>
Date:	Fri, 17 Jun 2011 14:59:51 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3.0-rc2-tip 4/22]  4: Uprobes: register/unregister
 probes.

* Oleg Nesterov <oleg@...hat.com> [2011-06-16 15:51:14]:

> 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.
> 

oh right.

> > 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.
> 

Okay.. thats a nice idea.

-- 
Thanks and Regards
Srikar
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