linux-kernel - Re: [PATCH v8 08/12] perf: Add perf_event

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Message-ID: <4d5bf14a-0465-47b2-88c3-1bf85b008707@linaro.org>
Date: Thu, 25 Sep 2025 14:36:30 +0100
From: James Clark <james.clark@...aro.org>
To: Will Deacon <will@...nel.org>, Peter Zijlstra <peterz@...radead.org>,
 Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: 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, Ingo Molnar <mingo@...hat.com>,
 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 <leo.yan@....com>,
 Anshuman Khandual <anshuman.khandual@....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>, Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH v8 08/12] perf: Add perf_event_attr::config4



On 01/09/2025 1:40 pm, 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>
> Reviewed-by: Ian Rogers <irogers@...gle.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 */
>   };
>   
>   /*
> 


Hi Peter,

Did you get a chance to look at this? Patches 1-7 have been taken, just 
waiting on an ack to take this config4 change before taking the 
remaining ones.

Thanks
James