linux-kernel - Re: perf: unwind: target platform=x86 not supported was: Re: [PATCH 1/2] perf evsel: Fix probing of precise

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Date:   Wed, 14 Jun 2017 16:31:41 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        linux-kernel@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        David Ahern <dsahern@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Wang Nan <wangnan0@...wei.com>
Subject: Re: perf: unwind: target platform=x86 not supported was:  Re: [PATCH
 1/2] perf evsel: Fix probing of precise_ip level for default cycles event

On Wed, Jun 14, 2017 at 04:19:51PM +0200, Jiri Olsa wrote:
> On Wed, Jun 14, 2017 at 10:52:42AM -0300, Arnaldo Carvalho de Melo wrote:
> 
> SNIP
> 
> > 
> > And what defines it is...
> > 
> > tools/perf/util/libunwind/x86_32.c:#define REMOTE_UNWIND_LIBUNWIND
> > 
> > (and a arm64 file, but lets leave that aside, seems unrelated to this
> > case)
> > 
> > That will get built by...
> > 
> > tools/perf/util/Build:libperf-$(CONFIG_LIBUNWIND_X86)      += libunwind/x86_32.o
> > 
> > [acme@...et linux]$ grep CONFIG_LIBUNWIND_X86 /tmp/build/perf/.config-detected
> > [acme@...et linux]$
> > 
> > Ingo, are you doing something unusual as building a 32-bit perf to read a
> > 62-bit perf.data file?
> > 
> > Jiri, can you help here? Do you need more info?
> 
> hum, looks like local unwind support wasn't compiled in for some reason
> 
> Ingo, what's the arch of host and perf data?

also "make clean && make VF=1 V=1" output would help

thanks,
jirka