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Subject: Re: [RFC 0/6] uprobes: kill uprobes_srcu/uprobe_srcu_id
From: Peter Zijlstra <peterz@infradead.org>
Date: Mon, 23 Apr 2012 09:14:00 +0200
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To: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>, Srikar Dronamraju <srikar@linux.vnet.ibm.com>, Andrew Morton <akpm@linux-foundation.org>, Linus Torvalds <torvalds@linux-foundation.org>, Ananth N Mavinakayanahalli <ananth@in.ibm.com>, Jim Keniston <jkenisto@linux.vnet.ibm.com>, LKML <linux-kernel@vger.kernel.org>, Linux-mm <linux-mm@kvack.org>, Andi Kleen <andi@firstfloor.org>, Christoph Hellwig <hch@infradead.org>, Steven Rostedt <rostedt@goodmis.org>, Arnaldo Carvalho de Melo <acme@infradead.org>, Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>, Thomas Gleixner <tglx@linutronix.de>, Anton Arapov <anton@redhat.com>

On Fri, 2012-04-20 at 20:37 +0200, Oleg Nesterov wrote:
> Say, a user wants to probe /sbin/init only. What if init forks?
> We should remove breakpoints from child->mm somehow.=20

How is that hard? dup_mmap() only copies the VMAs, this doesn't actually
copy the breakpoint. So the child doesn't have a breakpoint to be
removed.

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