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Date: Wed, 9 Jan 2008 22:21:03 +0100 From: Andi Kleen <andi@...stfloor.org> To: Jim Keniston <jkenisto@...ibm.com> Cc: Andi Kleen <andi@...stfloor.org>, ananth@...ibm.com, akpm@...ux-foundation.org, lkml <linux-kernel@...r.kernel.org>, mingo@...e.hu, mhiramat@...hat.com, davem@...emloft.net, hskinnemoen@...el.com Subject: Re: [PATCH] Kprobes: Add kprobes smoke tests that run on boot On Wed, Jan 09, 2008 at 12:24:00PM -0800, Jim Keniston wrote: > On Wed, 2008-01-09 at 00:28 +0100, Andi Kleen wrote: > > > I have no problem with that, but if we want to make it buildable as a > > > module, the call to get_kprobe() needs to be replaced with some other > > > gcc-inline-defeating mechanism, or we need to export get_probe(). I > > > > It's still unclear where noinline does not work (do you have details on that? > > It sounds a little dubious) ... > > Here's a simplified version of a module we've used to gauge kprobes > performance. On my system (i386, 2.6.23-rc8 at the moment, gcc version > 4.1.2), the module calls the (empty) probed function (probeme) niter > times, but reports zero probe hits -- indicating probeme was inlined > even though it was declared noinline. Yes indeed looks like a gcc bug. Have you reported it? -Andi -- 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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