linux-kernel - Re: [PATCH 1/3] perf probe: Set retprobe flag when probe in address-based alternative mode

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Message-ID: <20150413160551.GK3200@kernel.org>
Date:	Mon, 13 Apr 2015 13:05:51 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	He Kuang <hekuang@...wei.com>, a.p.zijlstra@...llo.nl,
	mingo@...hat.com, namhyung@...nel.org, wangnan0@...wei.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] perf probe: Set retprobe flag when probe in
 address-based alternative mode

Em Tue, Apr 14, 2015 at 12:42:52AM +0900, Masami Hiramatsu escreveu:
> (2015/04/13 20:41), He Kuang wrote:
> > Perf probe misses to set retprobe flag back when falling back to
> > address-based alternative mode.
> > 
> > Can be reproduced as following:
> > 
> >   $ perf probe -v -k vmlinux --add='sys_write%return'
> >   ...
> >   Added new event:
> >   Writing event: p:probe/sys_write _stext+1584952
> >     probe:sys_write      (on sys_write%return)
> > 
> >   $ cat /sys/kernel/debug/tracing/kprobe_events
> >   p:probe/sys_write _stext+1584952
> > 
> > After this patch:
> > 
> >   $ perf probe -v -k vmlinux --add='sys_write%return'
> >   Added new event:
> >   Writing event: r:probe/sys_write SyS_write+0
> >     probe:sys_write      (on sys_write%return)
> > 
> >   $ cat /sys/kernel/debug/tracing/kprobe_events
> >   r:probe/sys_write SyS_write
> > 
> > Signed-off-by: He Kuang <hekuang@...wei.com>
> 
> Oops, I missed that!
> 
> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> 
> Thank you!

Thanks to both of you, will add the extra comments from He and apply
after testing with a freshly build kernel with CONFIG_DEBUG_INFO=y.

- Arnaldo
 
> > ---
> >  tools/perf/util/probe-event.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> > index 30545ce..5483d98 100644
> > --- a/tools/perf/util/probe-event.c
> > +++ b/tools/perf/util/probe-event.c
> > @@ -332,6 +332,7 @@ static int find_alternative_probe_point(struct debuginfo *dinfo,
> >  	else {
> >  		result->offset += pp->offset;
> >  		result->line += pp->line;
> > +		result->retprobe = pp->retprobe;
> >  		ret = 0;
> >  	}
> >  
> > 
> 
> 
> -- 
> Masami HIRAMATSU
> Linux Technology Research Center, System Productivity Research Dept.
> Center for Technology Innovation - Systems Engineering
> Hitachi, Ltd., Research & Development Group
> E-mail: masami.hiramatsu.pt@...achi.com
> 
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