netdev - Re: [PATCH v5 06/10] perf tools: add destructors for parse event terms

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Date:   Wed, 6 Nov 2019 11:35:49 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, clang-built-linux@...glegroups.com,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v5 06/10] perf tools: add destructors for parse event
 terms

Em Wed, Nov 06, 2019 at 03:24:24PM +0100, Jiri Olsa escreveu:
> On Wed, Oct 30, 2019 at 03:34:44PM -0700, Ian Rogers wrote:
> > If parsing fails then destructors are ran to clean the up the stack.
> > Rename the head union member to make the term and evlist use cases more
> > distinct, this simplifies matching the correct destructor.
> > 
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> 
> Acked-by: Jiri Olsa <jolsa@...nel.org>
> 
> thanks,
> jirka
> > @@ -37,6 +38,25 @@ static struct list_head* alloc_list()
> >  	return list;
> >  }
> >  
> > +static void free_list_evsel(struct list_head* list_evsel)
> > +{
> > +	struct evsel *evsel, *tmp;
> > +
> > +	list_for_each_entry_safe(evsel, tmp, list_evsel, core.node) {
> > +		list_del_init(&evsel->core.node);
> > +		perf_evsel__delete(evsel);
> > +	}
> > +	free(list_evsel);
> > +}

Applying, but later I think we should use something like:

void __perf_evlist__purge(truct list_head *list)
{
	with the above code
}

And:

void perf_evlist__purge(struct perf_evlist *evlist)
{
	__perf_evlist__purge(&evlist->entries);
	evlist->nr_entries = 0;
}

To replace the existing:

static void perf_evlist__purge(struct perf_evlist *evlist)
{
        struct perf_evsel *pos, *n;

        perf_evlist__for_each_entry_safe(evlist, n, pos) {
                list_del_init(&pos->node);
                perf_evsel__delete(pos);
        }

        evlist->nr_entries = 0;
}

Anyway, applied.

- Arnaldo

> > +static void free_term(struct parse_events_term *term)
> > +{
> > +	if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
> > +		free(term->val.str);
> > +	zfree(&term->array.ranges);
> > +	free(term);
> > +}
> > +
> >  static void inc_group_count(struct list_head *list,
> >  		       struct parse_events_state *parse_state)
> >  {
> > @@ -66,6 +86,7 @@ static void inc_group_count(struct list_head *list,
> >  %type <num> PE_VALUE_SYM_TOOL
> >  %type <num> PE_RAW
> >  %type <num> PE_TERM
> > +%type <num> value_sym
> >  %type <str> PE_NAME
> >  %type <str> PE_BPF_OBJECT
> >  %type <str> PE_BPF_SOURCE
> > @@ -76,37 +97,43 @@ static void inc_group_count(struct list_head *list,
> >  %type <str> PE_EVENT_NAME
> >  %type <str> PE_PMU_EVENT_PRE PE_PMU_EVENT_SUF PE_KERNEL_PMU_EVENT
> >  %type <str> PE_DRV_CFG_TERM
> > -%type <num> value_sym
> > -%type <head> event_config
> > -%type <head> opt_event_config
> > -%type <head> opt_pmu_config
> > +%destructor { free ($$); } <str>
> >  %type <term> event_term
> > -%type <head> event_pmu
> > -%type <head> event_legacy_symbol
> > -%type <head> event_legacy_cache
> > -%type <head> event_legacy_mem
> > -%type <head> event_legacy_tracepoint
> > +%destructor { free_term ($$); } <term>
> > +%type <list_terms> event_config
> > +%type <list_terms> opt_event_config
> > +%type <list_terms> opt_pmu_config
> > +%destructor { parse_events_terms__delete ($$); } <list_terms>
> > +%type <list_evsel> event_pmu
> > +%type <list_evsel> event_legacy_symbol
> > +%type <list_evsel> event_legacy_cache
> > +%type <list_evsel> event_legacy_mem
> > +%type <list_evsel> event_legacy_tracepoint
> > +%type <list_evsel> event_legacy_numeric
> > +%type <list_evsel> event_legacy_raw
> > +%type <list_evsel> event_bpf_file
> > +%type <list_evsel> event_def
> > +%type <list_evsel> event_mod
> > +%type <list_evsel> event_name
> > +%type <list_evsel> event
> > +%type <list_evsel> events
> > +%type <list_evsel> group_def
> > +%type <list_evsel> group
> > +%type <list_evsel> groups
> > +%destructor { free_list_evsel ($$); } <list_evsel>
> >  %type <tracepoint_name> tracepoint_name
> > -%type <head> event_legacy_numeric
> > -%type <head> event_legacy_raw
> > -%type <head> event_bpf_file
> > -%type <head> event_def
> > -%type <head> event_mod
> > -%type <head> event_name
> > -%type <head> event
> > -%type <head> events
> > -%type <head> group_def
> > -%type <head> group
> > -%type <head> groups
> > +%destructor { free ($$.sys); free ($$.event); } <tracepoint_name>
> >  %type <array> array
> >  %type <array> array_term
> >  %type <array> array_terms
> > +%destructor { free ($$.ranges); } <array>
> >  
> >  %union
> >  {
> >  	char *str;
> >  	u64 num;
> > -	struct list_head *head;
> > +	struct list_head *list_evsel;
> > +	struct list_head *list_terms;
> >  	struct parse_events_term *term;
> >  	struct tracepoint_name {
> >  		char *sys;
> > -- 
> > 2.24.0.rc1.363.gb1bccd3e3d-goog
> > 

-- 

- Arnaldo