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SubjectRe: [PATCH] perf tools: update docs regarding kernel/user space unwinding

On March 27, 2020 5:09:34 PM GMT-03:00, Tony Jones <> wrote:
>On Thu, Mar 26, 2020 at 04:32:26PM -0500, Paul Clarke wrote:
>> > + and 'lbr'. The value 'dwarf' is effective only if libunwind
>> > + (or a recent version of libdw) is present on the system;
>> > + the value 'lbr' only works for certain cpus. The method for
>> > + kernel space is controlled not by this option but by the
>> > + kernel config (CONFIG_UNWINDER_*).
>> Your changes are just copying the old text, so this isn't a criticism
>of your patches.
>> Do we have information to replace "a recent version of libdw", which
>will quickly get stale?
>Hi Paul.
>The original "(libunwind or a recent version of libdw)" text was from
>Feb 2016. So a while ago.

Unfortunate wording, would be better to have the version where the required feature was added to libdw.

>bd0419e2a5a9f requires >= 0.157 but this is for probing. 0a4f2b6a3ba50
>specifies >= 0.158 but I see no mention of
>why in the commit but since it's from 2014 and elfutils is now at
>0.178, I think it's safe to just remove the
>As an aside, there is a lot of detail in perf-config.txt that's
>available in some of the other subcomands help files.
>Seems a good way for things to get stale. It could also do with some
>grammatical cleanup.

English as a second language, many contributors, please consider sending fixes, would be really appreciated,


- Arnaldo

Sent from my Android device with K-9 Mail. Please excuse my brevity.

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