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

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Message-ID: <20120423212536.GA8700@redhat.com>
Date:	Mon, 23 Apr 2012 23:25:36 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	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

forgot to mention,

On 04/23, Oleg Nesterov wrote:
>
> Just it seems to me there are to many "details"
> we should discuss to make the filtering reasonable.

And so far we assumed that consumer->filter() is "stable" and never
changes its mind.

Perhaps this is fine, but I am not sure. May we need need some
interface to add/del the task. Probably not, but unregister + register
doesn't look very convenient and can miss a hit.

> Yes, and probably this makes sense for handler_chain(). Although otoh
> I do not really understand what this filter buys us at this point.

But if we change the rules so that ->filter() or ->handler() itself can
return the "please remove this bp from ->mm" then perhaps it makes more
sense for the filtering. Again, not sure.

Oleg.

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