linux-kernel - Re: [PATCH 2/3] perf arm-spe: Save context ID in record

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Message-ID: <20211106134725.GI477387@leoy-ThinkPad-X240s>
Date:   Sat, 6 Nov 2021 21:47:25 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     German Gomez <german.gomez@....com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org, James Clark <james.clark@....com>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/3] perf arm-spe: Save context ID in record

On Tue, Nov 02, 2021 at 06:07:38PM +0000, German Gomez wrote:
> This patch is to save context ID in record, this will be used to set TID
> for samples.
> 
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> Signed-off-by: James Clark <james.clark@....com>
> Signed-off-by: German Gomez <german.gomez@....com>
> ---
>  tools/perf/util/arm-spe-decoder/arm-spe-decoder.c | 2 ++
>  tools/perf/util/arm-spe-decoder/arm-spe-decoder.h | 1 +
>  2 files changed, 3 insertions(+)
> 
> diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c b/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
> index 32fe41835..1b58859d2 100644
> --- a/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
> +++ b/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
> @@ -151,6 +151,7 @@ static int arm_spe_read_record(struct arm_spe_decoder *decoder)
>  	u64 payload, ip;
>  
>  	memset(&decoder->record, 0x0, sizeof(decoder->record));
> +	decoder->record.context_id = -1;

Since 'context_id' is type u64, here it's good to assign '(u64)-1'.

>  	while (1) {
>  		err = arm_spe_get_next_packet(decoder);
> @@ -180,6 +181,7 @@ static int arm_spe_read_record(struct arm_spe_decoder *decoder)
>  		case ARM_SPE_COUNTER:
>  			break;
>  		case ARM_SPE_CONTEXT:
> +			decoder->record.context_id = payload;
>  			break;
>  		case ARM_SPE_OP_TYPE:
>  			if (idx == SPE_OP_PKT_HDR_CLASS_LD_ST_ATOMIC) {
> diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-decoder.h b/tools/perf/util/arm-spe-decoder/arm-spe-decoder.h
> index 59bdb7309..46a8556a9 100644
> --- a/tools/perf/util/arm-spe-decoder/arm-spe-decoder.h
> +++ b/tools/perf/util/arm-spe-decoder/arm-spe-decoder.h
> @@ -38,6 +38,7 @@ struct arm_spe_record {
>  	u64 timestamp;
>  	u64 virt_addr;
>  	u64 phys_addr;
> +	u64 context_id;
>  };
>  
>  struct arm_spe_insn;
> -- 
> 2.25.1
>