linux-kernel - Re: [PATCH 0/4] Fix ebizzy performance regression due to X86 TLB range flush v2

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Message-ID: <20131218102412.GC20360@gmail.com>
Date:	Wed, 18 Dec 2013 11:24:12 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alex Shi <alex.shi@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	H Peter Anvin <hpa@...or.com>, Linux-X86 <x86@...nel.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 0/4] Fix ebizzy performance regression due to X86 TLB
 range flush v2


* Mel Gorman <mgorman@...e.de> wrote:

> > Thanks again for going through all this. Tracking multi-commit 
> > performance regressions across 1.5 years worth of commits is 
> > generally very hard. Does your testing effort comes from 
> > enterprise Linux QA testing, or did you ran into this problem 
> > accidentally?
> 
> It does not come from enterprise Linux QA testing but it's motivated 
> by it. I want to catch as many "obvious" performance bugs before 
> they do as it saves time and stress in the long run. To assist that, 
> I setup continual performance regression testing and ebizzy was 
> included in the first report I opened. [...]

Neat!

> [...]  It makes me worry what the rest of the reports contain.

It will be full with reports of phenomenal speedups!

Thanks,

	Ingo
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