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

[Steven Rostedt]

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

> From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> 
> 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@xxxxxxxxxxx
> Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> ---

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