Date: Fri, 17 Jun 2011 14:59:51 +0530
From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Oleg Nesterov <oleg@redhat.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>
Subject: Re: [PATCH v4 3.0-rc2-tip 4/22]  4: Uprobes: register/unregister
 probes.
Message-ID: <20110617092951.GA16985@linux.vnet.ibm.com>
Reply-To: Srikar Dronamraju <srikar@linux.vnet.ibm.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>
 <20110616135114.GA22131@redhat.com>
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* Oleg Nesterov <oleg@redhat.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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