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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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