All of lore.kernel.org
 help / color / mirror / Atom feed
From: Mao Han <han_mao@c-sky.com>
To: Palmer Dabbelt <palmer@sifive.com>
Cc: linux-riscv@lists.infradead.org, guoren@kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] riscv: Add support for libdw
Date: Mon, 29 Apr 2019 16:45:00 +0800	[thread overview]
Message-ID: <20190429084441.GC22718@vmh-VirtualBox> (raw)
In-Reply-To: <mhng-a74d03ae-cfb4-4e42-8950-f90816975291@palmer-si-x1e>

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 

WARNING: multiple messages have this Message-ID (diff)
From: Mao Han <han_mao@c-sky.com>
To: Palmer Dabbelt <palmer@sifive.com>
Cc: linux-riscv@lists.infradead.org, guoren@kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] riscv: Add support for libdw
Date: Mon, 29 Apr 2019 16:45:00 +0800	[thread overview]
Message-ID: <20190429084441.GC22718@vmh-VirtualBox> (raw)
In-Reply-To: <mhng-a74d03ae-cfb4-4e42-8950-f90816975291@palmer-si-x1e>

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 

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

  reply	other threads:[~2019-04-29  8:45 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-11  7:53 [PATCH 0/3] riscv: Add perf callchain support Mao Han
2019-04-11  7:53 ` [PATCH 1/3] " Mao Han
2019-04-11 14:24   ` Christoph Hellwig
2019-04-25 21:11   ` Palmer Dabbelt
2019-04-29  8:39     ` Mao Han
2019-04-29  8:39       ` Mao Han
2019-04-11  7:53 ` [PATCH 2/3] riscv: Add support for perf registers sampling Mao Han
2019-04-25 21:11   ` Palmer Dabbelt
2019-04-29  8:42     ` Mao Han
2019-04-29  8:42       ` Mao Han
2019-04-11  7:53 ` [PATCH 3/3] riscv: Add support for libdw Mao Han
2019-04-25 21:11   ` Palmer Dabbelt
2019-04-29  8:45     ` Mao Han [this message]
2019-04-29  8:45       ` Mao Han
2019-04-11 14:14 ` [PATCH 0/3] riscv: Add perf callchain support Christoph Hellwig
2019-04-12  9:38   ` [PATCH 2/3] riscv: Add support for perf registers sampling Mao Han
2019-04-13  8:01     ` Christoph Hellwig

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190429084441.GC22718@vmh-VirtualBox \
    --to=han_mao@c-sky.com \
    --cc=guoren@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-riscv@lists.infradead.org \
    --cc=palmer@sifive.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.