linux-kernel - Re: [PATCH v4 2/4] perf arm-spe: Use SPE data source for neoverse cores

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Date:   Sat, 26 Mar 2022 11:04:58 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Ali Saidi <alisaidi@...zon.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, german.gomez@....com,
        benh@...nel.crashing.org, Nick.Forrington@....com,
        alexander.shishkin@...ux.intel.com, andrew.kilroy@....com,
        james.clark@....com, john.garry@...wei.com, jolsa@...nel.org,
        kjain@...ux.ibm.com, lihuafei1@...wei.com, mark.rutland@....com,
        mathieu.poirier@...aro.org, mingo@...hat.com, namhyung@...nel.org,
        peterz@...radead.org, will@...nel.org
Subject: Re: [PATCH v4 2/4] perf arm-spe: Use SPE data source for neoverse
 cores

Em Sat, Mar 26, 2022 at 09:56:53PM +0800, Leo Yan escreveu:
> On Sat, Mar 26, 2022 at 10:52:01AM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Sat, Mar 26, 2022 at 09:47:54PM +0800, Leo Yan escreveu:
> > > On Thu, Mar 24, 2022 at 06:33:21PM +0000, Ali Saidi wrote:
> > > > +static void arm_spe__synth_data_source_neoverse(const struct arm_spe_record *record,
> > > > +						union perf_mem_data_src *data_src)
> > > >  {
> > > > -	union perf_mem_data_src	data_src = { 0 };
> > > > +	/*
> > > > +	 * Even though four levels of cache hierarchy are possible, no known
> > > > +	 * production Neoverse systems currently include more than three levels
> > > > +	 * so for the time being we assume three exist. If a production system
> > > > +	 * is built with four the this function would have to be changed to
> > > > +	 * detect the number of levels for reporting.
> > > > +	 */

> > > > -	if (record->op == ARM_SPE_LD)
> > > > -		data_src.mem_op = PERF_MEM_OP_LOAD;
> > > > -	else
> > > > -		data_src.mem_op = PERF_MEM_OP_STORE;

> > > Firstly, apologize that I didn't give clear idea when Ali sent patch sets
> > > v2 and v3.

> > Ok, removing this as well.

> > Thanks for reviewing.

> Thanks a lot, Arnaldo.  Yeah, it's good to give a bit more time to
> dismiss the concerns in this patch.

Sure, at least it was build tested on many distros/cross compilers and
this part is ok 8-)
 
> Sorry again for the inconvenience.

np.

- Arnaldo