linux-kernel - Re: [PATCH -tip v9 25/26] kprobes: Introduce kprobe cache to reduce cache misshits

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Date:	Fri, 25 Apr 2014 10:20:56 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	Frederic Weisbecker <fweisbec@...il.com>, x86@...nel.org,
	Steven Rostedt <rostedt@...dmis.org>, fche@...hat.com,
	mingo@...hat.com, systemtap@...rceware.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH -tip v9 25/26] kprobes: Introduce kprobe cache to reduce
 cache misshits


* Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:

> > So I don't think this should be a Kconfig entry, just enable it 
> > unconditionally. That will further simplify the code.
> 
> Hmm, it consumes some amount of memory (36KB/core) just for the case 
> of several thousand of kprobes. On enterprise servers and desktop 
> it's OK, no problem. But I think, some embedded systems with small 
> resources will not want that. [...]

They'll just disable kprobes in general.

Really, at this point complexity is our main concern.

Thanks,

	Ingo
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