linux-kernel - Re: [RFC 0/6] uprobes: kill uprobes_srcu/uprobe_srcu

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Message-ID: <20120420185836.GB2236@redhat.com>
Date:	Fri, 20 Apr 2012 20:58:36 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Anton Arapov <anton@...hat.com>
Subject: Re: [RFC 0/6] uprobes: kill uprobes_srcu/uprobe_srcu_id

On 04/20, Srikar Dronamraju wrote:
>
> Yes, We install breakpoints unconditionally, I think we had already
> discussed this and Oleg had proposed a solution too.
> http://lkml.org/lkml/2011/6/16/470 where we move the mm struct from task
> struct to signal struct.

Yes, this too.

Hmm. May be we can do something else? Currently uprobe_consumer->filter()
returns a boolean. Perhaps it can return "yes" || "no" || "remove_bp" ?
But then another uprobe_register(same_addr) should handle this case
somehow. Just a crazy idea, unlikely it makes sense.

Oleg.

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