linux-kernel - Re: [PATCH] perf report: Set PERF_SAMPLE_DATA

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Date:   Wed, 13 Apr 2022 17:16:04 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     German Gomez <german.gomez@....com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        James Clark <james.clark@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf report: Set PERF_SAMPLE_DATA_SRC bit for Arm SPE
 event

On Wed, Apr 13, 2022 at 10:14:00AM +0100, German Gomez wrote:
> 
> On 13/04/2022 09:49, Leo Yan wrote:
> > On Wed, Apr 13, 2022 at 09:15:40AM +0100, German Gomez wrote:
> >
> > [...]
> >
> >>>  	if (sort__mode == SORT_MODE__MEMORY) {
> >>> +		/*
> >>> +		 * FIXUP: prior to kernel 5.18, Arm SPE missed to set
> >>> +		 * PERF_SAMPLE_DATA_SRC bit in sample type.  For backward
> >>> +		 * compatibility, set the bit if it's an old perf data file.
> >>> +		 */
> >>> +		evlist__for_each_entry(session->evlist, evsel) {
> >>> +			if (strstr(evsel->name, "arm_spe_") &&
> >> This didn't work for me when the file recorded "-e arm_spe//" instead of
> >> "-e arm_spe_0//". Could you remove the trailing _? With that:
> > Sure, will change to "arm_spe".  Just curious, if there any local
> > change at your side so we have the different event name?
> 
> No local changes. I've always used "arm_spe//" and it always defaults to
> "arm_spe_0//". But it's still stored as the former in the data file. I
> haven't checked where this default happens though. Isn't it the same for
> you?

Yeah, this is same with me.  Thanks for explanation.

Leo