linux-kernel - Re: [RFC][Patch 1/4] kprobe fast unregistration

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Message-ID: <20070331130149.GA18345@infradead.org>
Date:	Sat, 31 Mar 2007 14:01:49 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	"Stone, Joshua I" <joshua.i.stone@...el.com>,
	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Prasanna S Panchamukhi <prasanna@...ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	SystemTAP <systemtap@...rces.redhat.com>,
	Satoshi Oshima <soshima@...hat.com>,
	Hideo Aoki <haoki@...hat.com>,
	Yumiko Sugita <yumiko.sugita.yf@...achi.com>, hch@...radead.org
Subject: Re: [RFC][Patch 1/4] kprobe fast unregistration

On Fri, Mar 23, 2007 at 02:22:48PM -0400, Frank Ch. Eigler wrote:
> Really?  What possible problems can occur?  The worst that occurs to
> me is that if someone forgets to call the commit function, the kprobes
> will still be disabled, but memory won't be recycled for a while.

Exactly.  It's a very unintuitive interface, exposing implementation
details to the user.  The array variant otoh is obvious to the user:
gice me an array of probes to register/unregister and do it.

> Would it be possible to allay even that concern with an automated
> deferred/periodic commit?

That's even worse from the user perspective interface. 

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