linux-kernel - Re: [GIT PULL] perf fixes

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Date:	Thu, 12 Sep 2013 22:10:54 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] perf fixes


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Thu, Sep 12, 2013 at 11:03 AM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> >
> > When I compiled "perf" at the same time as doing a big kernel compile,
> > the kernel compile failed
> 
> Oops. That may actually have been me being a bit *too* eager with a 
> "make allmodconfig" build. I can't reproduce it, and I'm starting to 
> suspect that I instead had two kernel compiles going, not one kernel 
> compile and a tools/perf/ compile.

Btw., building perf in parallel to an ongoing kernel compile is something 
I do almost daily, and I never saw problems due to that. A perf build is 
not supposed to cause any side effect on the kernel build and vice versa.

So in general it should just work.

>   "Yo Dawg, I heard you like kernel compiles, so I put a kernel compile 
> in your kernel compile so that you can compile the kernel while you 
> compile the kernel".

Heh, accidental dual kernel builds within the same kernel tree is 
something I have a _lot_ of involuntary experience with, and I usually 
recognize the error message patterns straight away ;-)

As a kernel hacker one learns useful skills all the time!

Thanks,

	Ingo
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