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Re: [PATCH 2/2] perf annotate: add powerpc support

From	"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 2/2] perf annotate: add powerpc support
Date	2016-06-10 16:50 +0200
Message-ID	<rIvUZ-5O9-21@gated-at.bofh.it> (permalink)
References	<rIume-4YI-23@gated-at.bofh.it> <rIume-4YI-21@gated-at.bofh.it> <rIuPg-58O-29@gated-at.bofh.it>
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On 2016/06/10 10:36AM, Arnaldo Carvalho de Melo wrote:
> Em Fri, Jun 10, 2016 at 06:32:51PM +0530, Naveen N. Rao escreveu:
> > Convert ins__find() to a __weak function for generic functionality,
> > while adding a powerpc-specific variant. We look at the function name
> > for branch instructions and classify the instructions to one among a
> > branch, a function call (branch with LR update) or a function return
> > (branch to LR).
> 
> How would this allow one to get a perf.data collected on a powerpc
> system, transfer it to a x86-64 (or aarch64, to mention another
> workstation wannabe chip) system and then try annotating it?
> 
> There was a previous discussion about this, and it involved having all
> yout ppc tables available as well as other arches tables, and then
> choosing which one to use based on:
> 
> 	normalize_arch(thread->mg->machine->env->arch)
> 
> just like was done for support cross unwinding, see recent patch kit by
> He Kuang, CCed.

Nice. This would be good to have. I will look at adding powerpc support 
for cross-architecture unwind.

However, for cross-architecture annotation, I think there will be a lot 
more dependencies since perf currently uses objdump to obtain the 
disassembly. In addition, the actual binaries will also be needed.


- Naveen

Thread

[PATCH 2/2] perf annotate: add powerpc support "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2016-06-10 15:10 +0200
  Re: [PATCH 2/2] perf annotate: add powerpc support Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-06-10 15:40 +0200
    Re: [PATCH 2/2] perf annotate: add powerpc support "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2016-06-10 16:50 +0200
      Re: [PATCH 2/2] perf annotate: add powerpc support "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2016-06-10 18:10 +0200

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