linux-kernel - Re: [PATCH 3/8] perf record: Add BPF event filter support

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Message-ID: <Y/Sw9Cd5nvf/YKjA@krava>
Date:   Tue, 21 Feb 2023 12:54:28 +0100
From:   Jiri Olsa <olsajiri@...il.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Song Liu <song@...nel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Leo Yan <leo.yan@...aro.org>,
        James Clark <james.clark@....com>, Hao Luo <haoluo@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH 3/8] perf record: Add BPF event filter support

On Sat, Feb 18, 2023 at 10:13:24PM -0800, Namhyung Kim wrote:

SNIP

> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 8374117e66f6..6429915d376d 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -52,6 +52,7 @@
>  #include "util/pmu-hybrid.h"
>  #include "util/evlist-hybrid.h"
>  #include "util/off_cpu.h"
> +#include "util/bpf-filter.h"
>  #include "asm/bug.h"
>  #include "perf.h"
>  #include "cputopo.h"
> @@ -1364,6 +1365,14 @@ static int record__open(struct record *rec)
>  
>  	session->evlist = evlist;
>  	perf_session__set_id_hdr_size(session);
> +
> +	evlist__for_each_entry(evlist, pos) {
> +		if (list_empty(&pos->bpf_filters))
> +			continue;
> +		rc = perf_bpf_filter__prepare(pos);
> +		if (rc)
> +			break;
> +	}

might fit better under evlist__apply_filters ?

jirka

>  out:
>  	return rc;
>  }
> diff --git a/tools/perf/util/bpf_counter.c b/tools/perf/util/bpf_counter.c
> index eeee899fcf34..0414385794ee 100644
> --- a/tools/perf/util/bpf_counter.c
> +++ b/tools/perf/util/bpf_counter.c
> @@ -781,8 +781,7 @@ extern struct bpf_counter_ops bperf_cgrp_ops;
>  
>  static inline bool bpf_counter_skip(struct evsel *evsel)
>  {
> -	return list_empty(&evsel->bpf_counter_list) &&
> -		evsel->follower_skel == NULL;
> +	return evsel->bpf_counter_ops == NULL;
>  }
>  

SNIP