linux-kernel - Re: [PATCH] perf probe: Ignore tail calls to probed functions

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Message-ID: <20150512134041.GD29215@kernel.org>
Date:	Tue, 12 May 2015 10:40:41 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, srikar@...ux.vnet.ibm.com
Subject: Re: [PATCH] perf probe: Ignore tail calls to probed functions

Em Fri, May 01, 2015 at 08:41:57AM +0900, Masami Hiramatsu escreveu:
> On 2015/04/30 23:58, Naveen N. Rao wrote:
> > The frame ends at 0xc0000000000bc27c. I suppose this is why this 
> > particular call is a "tail" call. FWIW, systemtap seems to ignore these 
> > as well and requires users to explicitly place probes at these call 
> > sites if necessary. I print out the caller so that users know.
> 
> Ah, OK. That is out of the function frame, thus we can't put probe on it.
> Hmm, we'd better wait for improvement of tail call support in dwarf...
> Anyway, at this point, I'm OK for ignoring the probe point.
> 
> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>

Thanks, applied.

- Arnaldo
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