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

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Message-ID: <20180501144248.1fb71b20@gandalf.local.home>
Date:   Tue, 1 May 2018 14:42:48 -0400
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 Thu, 30 Nov 2017 19:22:33 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> 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.
>

Looks like it I forgot to add it to the queue (actually, I remember
having issues with that queue and restarted it), and this was dropped.

Adding it this time for 4.18

Sorry about that. :-/

-- Steve