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Date: Tue, 30 Sep 2014 09:16:27 +0200
From: Jiri Olsa <jolsa@redhat.com>
To: Namhyung Kim <namhyung@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Ingo Molnar <mingo@kernel.org>, Paul Mackerras <paulus@samba.org>,
        Namhyung Kim <namhyung.kim@lge.com>,
        LKML <linux-kernel@vger.kernel.org>, Arun Sharma <asharma@fb.com>,
        David Ahern <dsahern@gmail.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Jean Pihet <jean.pihet@linaro.org>
Subject: Re: [PATCH v2 1/2] perf callchain: Create an address space per thread
Message-ID: <20140930071627.GA27883@krava.brq.redhat.com>
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On Tue, Sep 30, 2014 at 03:11:21PM +0900, Namhyung Kim wrote:
> Hi Jiri,
> 
> On Mon, 29 Sep 2014 10:34:52 +0200, Jiri Olsa wrote:
> > On Mon, Sep 29, 2014 at 01:58:11PM +0900, Namhyung Kim wrote:
> >> @@ -37,6 +38,9 @@ struct thread *thread__new(pid_t pid, pid_t tid)
> >>  		thread->cpu = -1;
> >>  		INIT_LIST_HEAD(&thread->comm_list);
> >>  
> >> +		if (unwind__prepare_access(thread) < 0)
> >> +			goto err_thread;
> >
> > So this is something we need to do only for DWARF unwind via libunwind.
> > Do we want some condition to bypass this in for the rest of the cases?
> 
> Ah, you're right, we need to check that before doing this.
> 
> 
> >
> > I think we could check for symbol_conf.use_callchain and for the
> > PERF_SAMPLE_REGS_USER|PERF_SAMPLE_STACK_USER sample types in evlist,
> > something like:
> >
> >   bool has_dwarf_data_for_callchains = symbol_conf.use_callchain && evlist_sample_type_has(evlist, PERF_SAMPLE_REGS_USER|PERF_SAMPLE_STACK_USER)
> 
> Hmm.. it seems that it's hard to get the evlist at this point.  Maybe we
> need to add a field in the symbol_conf or a global variable.. :/

yea, symbol_conf seems ok

jirka