linux-kernel - RE: [PATCH v2 3/3] perf vendor events: Add Fujitsu A64FX V1.2 pmu event

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Date:   Fri, 22 Jan 2021 08:37:11 +0000
From:   "nakamura.shun@...itsu.com" <nakamura.shun@...itsu.com>
To:     'John Garry' <john.garry@...wei.com>
CC:     "will@...nel.org" <will@...nel.org>,
        "mathieu.poirier@...aro.org" <mathieu.poirier@...aro.org>,
        "leo.yan@...aro.org" <leo.yan@...aro.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 3/3] perf vendor events: Add Fujitsu A64FX V1.2 pmu
 event

Hi John

> I think that we need to the same here as the IMPDEF recommended events - add a
> common JSON to reduce the duplication.
> 
> I had done work on this for current CPUs, but never got it finished. Let me check
> the status.

If you let me know the result, I will resend the patch according to the policy.

Best Regards

> -----Original Message-----
> From: John Garry <john.garry@...wei.com>
> Sent: Friday, January 22, 2021 2:41 AM
> To: Nakamura, Shunsuke/中村 俊介 <nakamura.shun@...itsu.com>
> Cc: will@...nel.org; mathieu.poirier@...aro.org; leo.yan@...aro.org;
> linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v2 3/3] perf vendor events: Add Fujitsu A64FX V1.2 pmu
> event
> 
> On 21/01/2021 10:54, Shunsuke Nakamura wrote:
> > +  {
> > +    "PublicDescription": "This event counts each correction to the predicted
> program flow that occurs because of a misprediction from, or no prediction from,
> the branch prediction resources and that relates to instructions that the branch
> prediction resources are capable of predicting.",
> > +    "EventCode": "0x10",
> > +    "EventName": "BR_MIS_PRED",
> 
> I think that we need to the same here as the IMPDEF recommended events - add a
> common JSON to reduce the duplication.
> 
> I had done work on this for current CPUs, but never got it finished. Let me check
> the status.
> 
> Cheers,
> John
> 
> Ps, arm have put JSONs here for their cores:
> 
> https://github.com/ARM-software/data/tree/master/pmu
> 
> But unfortunately the schema does not suit perf.
> 
> I raised an issue, but no response.
> 
> I'm just wondering if you hand copied the JSON data.
> 
> 
> > +    "BriefDescription": "This event counts each correction to the predicted
> program flow that occurs because of a misprediction from, or no prediction from,
> the branch prediction resources and that relates to instructions that the branch
> prediction resources are capable of predicting."
> > +  },