Re: [RFC][PATCH 00/36] objtool: Make recordmcount a subcommand

[Peter Zijlstra]

On Tue, Apr 14, 2020 at 05:47:02PM -0400, Steven Rostedt wrote:
> On Tue, 14 Apr 2020 23:17:54 +0200
> Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> 
> > > Do we want that? Matters how long that takes.  
> > 
> > We do want that, however it is conditional on CONFIG_DEBUG_ENTRY and
> > does some rather specific validation. On a defconfig based kernel it
> > takes ~2.5 seconds, significantly more an an allyesconfig.
> 
> Is that timed on your laptop, or on the monster machine you normally do your
> builds on?
> 
> 2.5 seconds for you may be 2.5 minutes for others! ;-)

Final link pass, and objtool, is single threaded, the ~2.5s were on an
old-ish 2.8GHz part, ie, most laptops are faster today.

The machine has a few more cores than laptops have, so total build time
is still managable, unlike laptops. Also, it being a server part, it
suffers less thermal issues.