linux-kernel - Re: [PATCH] perf probe: Fix bug in perf probe with global variables

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Date:	Mon, 27 Apr 2015 13:38:53 -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, paulus@...ba.org, wangnan0@...wei.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf probe: Fix bug in perf probe with global variables

Em Sun, Apr 26, 2015 at 09:56:06AM +0900, Masami Hiramatsu escreveu:
> (2015/04/25 17:08), He Kuang wrote:
> > There are missing curly braces which causes find_variable() return wrong
> > value when probing with global variables.
> > 
> > This problem can be reproduced as following:
> > 
> >   $ perf probe -v --add='generic_perform_write global_variable_for_test'
> >   ...
> >   Try to find probe point from debuginfo.
> >   Probe point found: generic_perform_write+0
> >   Searching 'global_variable_for_test' variable in context.
> >   An error occurred in debuginfo analysis (-2).
> >     Error: Failed to add events. Reason: No such file or directory (Code: -2)
> > 
> > After this patch:
> > 
> >   $ perf probe -v --add='generic_perform_write global_variable_for_test'
> >   ...
> >   Converting variable global_variable_for_test into trace event.
> >   global_variable_for_test type is int.
> >   Found 1 probe_trace_events.
> >   Opening /sys/kernel/debug/tracing/kprobe_events write=1
> >   Added new event:
> >   Writing event: p:probe/generic_perform_write _stext+1237464
> >   global_variable_for_test=@...bal_variable_for_test+0:s32
> >     probe:generic_perform_write (on generic_perform_write with
> >     global_variable_for_test)
> > 
> >   You can now use it in all perf tools, such as:
> > 
> >       perf record -e probe:generic_perform_write -aR sleep 1
> 
> Oops, that's my fault! :(
> 
> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> 
> Thank you!!

Thanks, applied to perf/urgent.

- Arnaldo
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