Re: [PATCH v5 1/2] perf parse: Refactor struct perf_evsel_config_term

From: Mathieu Poirier
Date: Mon Jan 13 2020 - 12:04:29 EST

On Mon, 13 Jan 2020 at 08:18, Leo Yan <leo.yan@xxxxxxxxxx> wrote:
>
> The struct perf_evsel_config_term::val is a union which contains
> fields 'callgraph', 'drv_cfg' and 'branch' as string pointers. This
> leads to the complex code logic for handling every type's string
> separately, and it's hard to release string as a general way.
>
> This patch refactors the structure to add a common field 'str' in the
> 'val' union as string pointer and remove the other three fields
> 'callgraph', 'drv_cfg' and 'branch'. Without passing field name, the
> patch simplifies the string handling with macro ADD_CONFIG_TERM_STR()
> for string pointer assignment.
>
> Signed-off-by: Leo Yan <leo.yan@xxxxxxxxxx>
> ---
> tools/perf/arch/arm/util/cs-etm.c | 2 +-
> tools/perf/util/evsel.c | 6 ++--
> tools/perf/util/evsel_config.h | 4 +--
> tools/perf/util/parse-events.c | 53 ++++++++++++++++++-------------
> 4 files changed, 36 insertions(+), 29 deletions(-)
>
> diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
> index ede040cf82ad..2898cfdf8fe1 100644
> --- a/tools/perf/arch/arm/util/cs-etm.c
> +++ b/tools/perf/arch/arm/util/cs-etm.c
> @@ -226,7 +226,7 @@ static int cs_etm_set_sink_attr(struct perf_pmu *pmu,
> if (term->type != PERF_EVSEL__CONFIG_TERM_DRV_CFG)
> continue;
>
> - sink = term->val.drv_cfg;
> + sink = term->val.str;
> snprintf(path, PATH_MAX, "sinks/%s", sink);
>
> ret = perf_pmu__scan_file(pmu, path, "%x", &hash);
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index a69e64236120..549abd43816f 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -808,12 +808,12 @@ static void apply_config_terms(struct evsel *evsel,
> perf_evsel__reset_sample_bit(evsel, TIME);
> break;
> case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
> - callgraph_buf = term->val.callgraph;
> + callgraph_buf = term->val.str;
> break;
> case PERF_EVSEL__CONFIG_TERM_BRANCH:
> - if (term->val.branch && strcmp(term->val.branch, "no")) {
> + if (term->val.str && strcmp(term->val.str, "no")) {
> perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
> - parse_branch_str(term->val.branch,
> + parse_branch_str(term->val.str,
> &attr->branch_sample_type);
> } else
> perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
> diff --git a/tools/perf/util/evsel_config.h b/tools/perf/util/evsel_config.h
> index 1f8d2fe0b66e..b4a65201e4f7 100644
> --- a/tools/perf/util/evsel_config.h
> +++ b/tools/perf/util/evsel_config.h
> @@ -36,18 +36,16 @@ struct perf_evsel_config_term {
> u64 period;
> u64 freq;
> bool time;
> - char *callgraph;
> - char *drv_cfg;
> u64 stack_user;
> int max_stack;
> bool inherit;
> bool overwrite;
> - char *branch;
> unsigned long max_events;
> bool percore;
> bool aux_output;
> u32 aux_sample_size;
> u64 cfg_chg;
> + char *str;
> } val;
> bool weak;
> };
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index ed7c008b9c8b..64b394519a4c 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -1219,8 +1219,7 @@ static int config_attr(struct perf_event_attr *attr,
> static int get_config_terms(struct list_head *head_config,
> struct list_head *head_terms __maybe_unused)
> {
> -#define ADD_CONFIG_TERM(__type, __name, __val) \
> -do { \
> +#define ADD_CONFIG_TERM(__type) \
> struct perf_evsel_config_term *__t; \
> \
> __t = zalloc(sizeof(*__t)); \
> @@ -1229,9 +1228,19 @@ do { \
> \
> INIT_LIST_HEAD(&__t->list); \
> __t->type = PERF_EVSEL__CONFIG_TERM_ ## __type; \
> - __t->val.__name = __val; \
> __t->weak = term->weak; \
> - list_add_tail(&__t->list, head_terms); \
> + list_add_tail(&__t->list, head_terms)
> +
> +#define ADD_CONFIG_TERM_VAL(__type, __name, __val) \
> +do { \
> + ADD_CONFIG_TERM(__type); \
> + __t->val.__name = __val; \
> +} while (0)
> +
> +#define ADD_CONFIG_TERM_STR(__type, __val) \
> +do { \
> + ADD_CONFIG_TERM(__type); \
> + __t->val.str = __val; \
> } while (0)
>
> struct parse_events_term *term;
> @@ -1239,53 +1248,53 @@ do { \
> list_for_each_entry(term, head_config, list) {
> switch (term->type_term) {
> case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
> - ADD_CONFIG_TERM(PERIOD, period, term->val.num);
> + ADD_CONFIG_TERM_VAL(PERIOD, period, term->val.num);
> break;
> case PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ:
> - ADD_CONFIG_TERM(FREQ, freq, term->val.num);
> + ADD_CONFIG_TERM_VAL(FREQ, freq, term->val.num);
> break;
> case PARSE_EVENTS__TERM_TYPE_TIME:
> - ADD_CONFIG_TERM(TIME, time, term->val.num);
> + ADD_CONFIG_TERM_VAL(TIME, time, term->val.num);
> break;
> case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
> - ADD_CONFIG_TERM(CALLGRAPH, callgraph, term->val.str);
> + ADD_CONFIG_TERM_STR(CALLGRAPH, term->val.str);
> break;
> case PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE:
> - ADD_CONFIG_TERM(BRANCH, branch, term->val.str);
> + ADD_CONFIG_TERM_STR(BRANCH, term->val.str);
> break;
> case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
> - ADD_CONFIG_TERM(STACK_USER, stack_user, term->val.num);
> + ADD_CONFIG_TERM_VAL(STACK_USER, stack_user, term->val.num);
> break;
> case PARSE_EVENTS__TERM_TYPE_INHERIT:
> - ADD_CONFIG_TERM(INHERIT, inherit, term->val.num ? 1 : 0);
> + ADD_CONFIG_TERM_VAL(INHERIT, inherit, term->val.num ? 1 : 0);
> break;
> case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
> - ADD_CONFIG_TERM(INHERIT, inherit, term->val.num ? 0 : 1);
> + ADD_CONFIG_TERM_VAL(INHERIT, inherit, term->val.num ? 0 : 1);
> break;
> case PARSE_EVENTS__TERM_TYPE_MAX_STACK:
> - ADD_CONFIG_TERM(MAX_STACK, max_stack, term->val.num);
> + ADD_CONFIG_TERM_VAL(MAX_STACK, max_stack, term->val.num);
> break;
> case PARSE_EVENTS__TERM_TYPE_MAX_EVENTS:
> - ADD_CONFIG_TERM(MAX_EVENTS, max_events, term->val.num);
> + ADD_CONFIG_TERM_VAL(MAX_EVENTS, max_events, term->val.num);
> break;
> case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
> - ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 1 : 0);
> + ADD_CONFIG_TERM_VAL(OVERWRITE, overwrite, term->val.num ? 1 : 0);
> break;
> case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
> - ADD_CONFIG_TERM(OVERWRITE, overwrite, term->val.num ? 0 : 1);
> + ADD_CONFIG_TERM_VAL(OVERWRITE, overwrite, term->val.num ? 0 : 1);
> break;
> case PARSE_EVENTS__TERM_TYPE_DRV_CFG:
> - ADD_CONFIG_TERM(DRV_CFG, drv_cfg, term->val.str);
> + ADD_CONFIG_TERM_STR(DRV_CFG, term->val.str);
> break;
> case PARSE_EVENTS__TERM_TYPE_PERCORE:
> - ADD_CONFIG_TERM(PERCORE, percore,
> - term->val.num ? true : false);
> + ADD_CONFIG_TERM_VAL(PERCORE, percore,
> + term->val.num ? true : false);
> break;
> case PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT:
> - ADD_CONFIG_TERM(AUX_OUTPUT, aux_output, term->val.num ? 1 : 0);
> + ADD_CONFIG_TERM_VAL(AUX_OUTPUT, aux_output, term->val.num ? 1 : 0);
> break;
> case PARSE_EVENTS__TERM_TYPE_AUX_SAMPLE_SIZE:
> - ADD_CONFIG_TERM(AUX_SAMPLE_SIZE, aux_sample_size, term->val.num);
> + ADD_CONFIG_TERM_VAL(AUX_SAMPLE_SIZE, aux_sample_size, term->val.num);
> break;
> default:
> break;
> @@ -1322,7 +1331,7 @@ static int get_config_chgs(struct perf_pmu *pmu, struct list_head *head_config,
> }
>
> if (bits)
> - ADD_CONFIG_TERM(CFG_CHG, cfg_chg, bits);
> + ADD_CONFIG_TERM_VAL(CFG_CHG, cfg_chg, bits);
>
> #undef ADD_CONFIG_TERM
> return 0;

There are checkpatch warnings - please address them.

Mathieu

> --
> 2.17.1
>