linux-kernel - Re: [PATCH v3 06/10] perf: Add perf_event

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Message-ID: <aHUMmgt2fCSfxy6f@willie-the-truck>
Date: Mon, 14 Jul 2025 14:56:42 +0100
From: Will Deacon <will@...nel.org>
To: James Clark <james.clark@...aro.org>
Cc: Catalin Marinas <catalin.marinas@....com>,
	Mark Rutland <mark.rutland@....com>,
	Jonathan Corbet <corbet@....net>, Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>, leo.yan@....com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org, linux-doc@...r.kernel.org,
	kvmarm@...ts.linux.dev
Subject: Re: [PATCH v3 06/10] perf: Add perf_event_attr::config4

On Thu, Jun 05, 2025 at 11:49:04AM +0100, James Clark wrote:
> Arm FEAT_SPE_FDS adds the ability to filter on the data source of a
> packet using another 64-bits of event filtering control. As the existing
> perf_event_attr::configN fields are all used up for SPE PMU, an
> additional field is needed. Add a new 'config4' field.
> 
> Reviewed-by: Leo Yan <leo.yan@....com>
> Tested-by: Leo Yan <leo.yan@....com>
> Signed-off-by: James Clark <james.clark@...aro.org>
> ---
>  include/uapi/linux/perf_event.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> index 78a362b80027..0d0ed85ad8cb 100644
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -382,6 +382,7 @@ enum perf_event_read_format {
>  #define PERF_ATTR_SIZE_VER6			120	/* Add: aux_sample_size */
>  #define PERF_ATTR_SIZE_VER7			128	/* Add: sig_data */
>  #define PERF_ATTR_SIZE_VER8			136	/* Add: config3 */
> +#define PERF_ATTR_SIZE_VER9			144	/* add: config4 */
>  
>  /*
>   * 'struct perf_event_attr' contains various attributes that define
> @@ -543,6 +544,7 @@ struct perf_event_attr {
>  	__u64	sig_data;
>  
>  	__u64	config3; /* extension of config2 */
> +	__u64	config4; /* extension of config3 */
>  };

Looks straightforward to me, but this will need an Ack from one of the perf
core maintainers.

Will