Re: [PATCH v0 3/5] perf: Introduce instruction trace filtering

[Peter Zijlstra <peterz@infradead.org>]

On Fri, Dec 11, 2015 at 03:36:36PM +0200, Alexander Shishkin wrote:

> The pmu driver interface basically adds an extra callback to the
> pmu driver structure, which validates the filter configuration proposed
> by the user against what the hardware is actually capable of doing
> and translates it into something that pmu::start can program into
> hardware.

> @@ -388,12 +393,38 @@ struct pmu {
>  	void (*free_aux)		(void *aux); /* optional */
>  
>  	/*
> +	 * Validate instruction tracing filters: make sure hw supports the
> +	 * requested configuration and number of filters.
> +	 *
> +	 * Configure instruction tracing filters: translate hw-agnostic filter
> +	 * into hardware configuration in event::hw::itrace_filters
> +	 */
> +	int (*itrace_filter_setup)	(struct perf_event *event); /* optional */
> +
> +	/*
>  	 * Filter events for PMU-specific reasons.
>  	 */
>  	int (*filter_match)		(struct perf_event *event); /* optional */
>  };

Any reason you cannot use pmu::filter_match ?