linux-kernel - Re: [PATCH 11/21] trace: Use -mcount-record for dynamic ftrace

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Date:   Thu, 30 Nov 2017 19:22:33 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        samitolvanen@...gle.com, alxmtvv@...il.com,
        linux-kbuild@...r.kernel.org, yamada.masahiro@...ionext.com,
        akpm@...ux-foundation.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 11/21] trace: Use -mcount-record for dynamic ftrace

On Mon, 27 Nov 2017 13:34:13 -0800
Andi Kleen <andi@...stfloor.org> wrote:

> From: Andi Kleen <ak@...ux.intel.com>
> 
> gcc 5 supports a new -mcount-record option to generate ftrace
> tables directly. This avoids the need to run record_mcount
> manually.
> 
> Use this option when available.
> 
> So far doesn't use -mcount-nop, which also exists now.
> 
> This is needed to make ftrace work with LTO because the
> normal record-mcount script doesn't run over the link
> time output.
> 
> It should also improve build times slightly in the general
> case.
> 
> Cc: rostedt@...dmis.org
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---

Hi Andi,

Thanks for sending this. I'm currently trying to catch up on all the
changes that need to get into 4.15 and will be doing a bit of
traveling.

I plan on looking at this in a week or two, and add it to the 4.16
queue.

-- Steve