linux-kernel - Re: [PATCH v3 1/8] perf bpf-filter: Make filters map a single entry hashmap

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Message-ID: <ZqFgnwK5ZSjmEAQj@google.com>
Date: Wed, 24 Jul 2024 13:14:23 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Ian Rogers <irogers@...gle.com>, Kan Liang <kan.liang@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org, KP Singh <kpsingh@...nel.org>,
	Song Liu <song@...nel.org>, bpf@...r.kernel.org,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v3 1/8] perf bpf-filter: Make filters map a single entry
 hashmap

On Wed, Jul 24, 2024 at 03:55:15PM -0300, Arnaldo Carvalho de Melo wrote:
> On Wed, Jul 03, 2024 at 03:30:28PM -0700, Namhyung Kim wrote:
> > And the value is now an array.  This is to support multiple filter
> > entries in the map later.
>  
> > No functional changes intended.
> 
> > +++ b/tools/perf/util/bpf-filter.c
> > @@ -93,71 +93,102 @@ static int check_sample_flags(struct evsel *evsel, struct perf_bpf_filter_expr *
> >  
> >  int perf_bpf_filter__prepare(struct evsel *evsel)
> >  {
> > -	int i, x, y, fd;
> > +	int i, x, y, fd, ret;
> >  	struct sample_filter_bpf *skel;
> >  	struct bpf_program *prog;
> >  	struct bpf_link *link;
> >  	struct perf_bpf_filter_expr *expr;
> > +	struct perf_bpf_filter_entry *entry;
> > +
> > +	entry = calloc(MAX_FILTERS, sizeof(*entry));
> > +	if (entry == NULL)
> > +		return -1;
> 
> I'm changing this to -ENOMEM since you use errno values in the other
> failure cases, ok?

Sure thing!

Thanks,
Namhyung

> 
> This:
> 
> diff --git a/tools/perf/util/bpf-filter.c b/tools/perf/util/bpf-filter.c
> index 2510832d83f95e03..e98bacf41a248ced 100644
> --- a/tools/perf/util/bpf-filter.c
> +++ b/tools/perf/util/bpf-filter.c
> @@ -102,7 +102,7 @@ int perf_bpf_filter__prepare(struct evsel *evsel)
>  
>  	entry = calloc(MAX_FILTERS, sizeof(*entry));
>  	if (entry == NULL)
> -		return -1;
> +		return -ENOMEM;
>  
>  	skel = sample_filter_bpf__open_and_load();
>  	if (!skel) {