Re: [PATCH 7/7] DWARF: add the config option

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 7/7] DWARF: add the config option
Date	2017-05-23 09:10 +0200
Message-ID	<tKc78-8iP-15@gated-at.bofh.it> (permalink)
References	(2 earlier) <tDRyp-6eu-7@gated-at.bofh.it> <tECdY-30b-3@gated-at.bofh.it> <tFimS-5AC-13@gated-at.bofh.it> <tFiZA-66p-9@gated-at.bofh.it> <tFvk5-6Qp-5@gated-at.bofh.it>
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On Wed, May 10, 2017 at 10:32:06AM +0200, Jiri Slaby wrote:
> > But it does hurt, in the sense that the complicated format of DWARF CFI
> > means the unwinder has to jump through a lot more hoops to read it.
> 
> Why that matters, actually? Unwinder is nothing to be performance
> oriented. And if somebody is doing a lot of unwinding during runtime,
> they can switch to in-this-case-faster FP unwinder.

perf (and ftrace) like the unwinder to be considered performance
oriented.

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Re: [PATCH 7/7] DWARF: add the config option Peter Zijlstra <peterz@infradead.org> - 2017-05-23 09:10 +0200
  Re: [PATCH 7/7] DWARF: add the config option Ingo Molnar <mingo@kernel.org> - 2017-05-23 09:30 +0200

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