linux-kernel - Re: [PATCH 04/15] perf, x86: Use context switch callback to flush LBR stack

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Message-ID: <20131217161022.GA13205@gmail.com>
Date:	Tue, 17 Dec 2013 17:10:22 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	eranian@...gle.com, andi@...stfloor.org,
	Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH 04/15] perf, x86: Use context switch callback to flush
 LBR stack

* Yan, Zheng <zheng.z.yan@...el.com> wrote:

> From: "Yan, Zheng" <zheng.z.yan@...el.com>
> 
> Enable pmu context switch callback if LBR is used. Use the callback
> to flush LBR stack when process is scheduled in.
> 
> Signed-off-by: Yan, Zheng <zheng.z.yan@...el.com>

I see several fundamental problems with your series:

1)

Minimal changelogs like the ones in this series are completely 
unacceptable! You seem to be copying the changelog style of Andi 
Kleen: written to inform as little as possible.

Don't do that if you want your patches to get anywhere, instead adapt 
the akpm style:

 "Please update the changelog to describe the current behavior.

  Please also describe why you think that behavior should be changed.
  ie: what's the reason for this patch.
 "

2)

Also, there are frequent typos.

3)

Plus you didn't Cc: other perf maintainers like myself or Arnaldo.

4)

How can users actually make use of the changes you are doing? Cite 
actual perf analysis usecases in the 0/15 description and describe how 
your patches improve/enable all that.

Please fix all those problems and resend.

Thanks,

	Ingo
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