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Date: Tue, 02 Mar 2010 19:18:58 -0500
From: Masami Hiramatsu <mhiramat@...hat.com>
To: Mathieu Desnoyers <compudj@...stal.dyndns.org>
CC: Ingo Molnar <mingo@...e.hu>,
Frederic Weisbecker <fweisbec@...il.com>,
Ananth N Mavinakayanahalli <ananth@...ibm.com>,
lkml <linux-kernel@...r.kernel.org>,
systemtap <systemtap@...rces.redhat.com>,
DLE <dle-develop@...ts.sourceforge.net>,
Jim Keniston <jkenisto@...ibm.com>,
Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
Christoph Hellwig <hch@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
"H. Peter Anvin" <hpa@...or.com>,
Anders Kaseorg <andersk@...lice.com>,
Tim Abbott <tabbott@...lice.com>,
Andi Kleen <andi@...stfloor.org>,
Jason Baron <jbaron@...hat.com>
Subject: Re: [PATCH -tip v3&10 02/18] kprobes: Introduce generic insn_slot
framework
Masami Hiramatsu wrote:
> Mathieu Desnoyers wrote:
>> * Masami Hiramatsu (mhiramat@...hat.com) wrote:
>>> Make insn_slot framework support various size slots.
>>> Current insn_slot just supports one-size instruction buffer slot. However,
>>> kprobes jump optimization needs larger size buffers.
>>
>> OK, so you end up having one insn slot cache for kprobes and one insn
>> slot (eventually) for the static jump patching (which needs larger
>> instruction slots than kprobes). That seems like a good way to ensure
>> you do not use more memory than necessary.
>>
>> We could possibly go even further and automatically use the right insn
>> slot cache given the size of the instruction entry that must be added (a
>> bit like the memory allocator which have different pools for each
>> allocation order).
>
> Sure, that will be simpler interface.
>
>> Possibly that using the terminology of "memory pools" rather than
>> "cache" could be a better fit too. So what this really becomes is an
>> instruction slot allocator and garbage collector.
>
> Ah, right. It would be better to rename kprobe_insn_pool() :)
Hmm, I tried it. And finally, I found that this doesn't help
to simplify code... Maybe it is better to postpone it until
another user needs this feature.
Thank you,
--
Masami Hiramatsu
e-mail: mhiramat@...hat.com
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