* Re: [PATCH 3/3] riscv: Add support for libdw
[not found] ` <mhng-a74d03ae-cfb4-4e42-8950-f90816975291@palmer-si-x1e>
@ 2019-04-29 8:45 ` Mao Han
0 siblings, 0 replies; only message in thread
From: Mao Han @ 2019-04-29 8:45 UTC (permalink / raw)
To: Palmer Dabbelt; +Cc: linux-riscv, guoren, linux-kernel
On Thu, Apr 25, 2019 at 02:11:04PM -0700, Palmer Dabbelt wrote:
> On Thu, 11 Apr 2019 00:53:50 PDT (-0700), han_mao@c-sky.com wrote:
> >This patch add support for DWARF register mappings and libdw registers
> >initialization, which is used by perf callchain analyzing when
> >--call-graph=dwarf is given.
>
> Is there any way to make this the only backtracer? It's the only one that's
> likely to be useful on RISC-V without recompiling everything with
> -fno-omit-frame-pointer, which has a major performance hit.
>
Frame pointer is the default record mode in record_callchain_opt.
Some generic modification seems required to change this, default to
use dwarf if riscv and show corresponding message in --help.
Thanks,
Mao Han
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