linux-kernel - Re: [PATCH -tip] x86: perf_counter AMD supports performance monitoring for K7

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Date:	Thu, 11 Jun 2009 11:03:58 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] x86: perf_counter AMD supports performance
 monitoring for K7

On Thu, 2009-06-11 at 02:13 +0200, Ingo Molnar wrote:
> * Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:
> 
> > 
> > Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
> > ---
> >  arch/x86/kernel/cpu/perf_counter.c |    4 ++++
> >  1 files changed, 4 insertions(+), 0 deletions(-)
> > 
> > diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
> > index 240ca56..5d56742 100644
> > --- a/arch/x86/kernel/cpu/perf_counter.c
> > +++ b/arch/x86/kernel/cpu/perf_counter.c
> > @@ -1436,6 +1436,10 @@ static int intel_pmu_init(void)
> >  
> >  static int amd_pmu_init(void)
> >  {
> > +	/* performance-monitoring supported from K7 */
> > +	if (boot_cpu_data.x86 < 7)
> > +		return -ENODEV;
> > +
> >  	x86_pmu = amd_pmu;
> >  
> >  	switch (boot_cpu_data.x86) {
> 
> A commit under Linux consists of three parts:
> 
>   1) the title
>   2) the changlog
>   3) the body
> 
> This sloppy patch of yours manages to get _all_ three wrong:
> 
>   - the title is wrong (it is incorrect)
>   - the changelog is wrong (it is missing)
>   - the body is wrong (it is broken - K7 != family 7)
> 

oops, sorry here is updated patch :

[PATCH -tip] x86: perf_counter check AMD performance monitoring support

AMD supports performance monitoring from K7.

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
---
 arch/x86/kernel/cpu/perf_counter.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 57ae1be..719a7d5 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -1452,6 +1452,10 @@ static int intel_pmu_init(void)
 
 static int amd_pmu_init(void)
 {
+	/* performance-monitoring supported from K7 */
+	if (boot_cpu_data.x86 < 6)
+		return -ENODEV;
+
 	x86_pmu = amd_pmu;
 
 	switch (boot_cpu_data.x86) {
-- 
1.6.3.2


> What the heck is going on here?
> 

hmm, I am really surprise how I wrote Signed-off-by line correct, I was
really very upset at that time, and you know the reason, Please help
me ;-)

Thanks,
--
JSR

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