Re: [PATCH v2 02/11] perf tools: Refactor unit and scale function parameters
From: Arnaldo Carvalho de Melo
Date: Wed Oct 01 2014 - 13:09:52 EST
Em Wed, Oct 01, 2014 at 03:36:23PM +0100, Matt Fleming escreveu:
> From: Matt Fleming <matt.fleming@xxxxxxxxx>
>
> Passing pointers to alias modifiers 'unit' and 'scale' isn't very
> future-proof since if we add more modifiers to the list we'll end up
> passing more arguments.
>
> Instead wrap everything up in a struct perf_pmu_info, which can easily
> be expanded when additional alias modifiers are necessary in the future.
>
> Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx>
> ---
>
> Changes in v2:
> - Added Jiri's ACK
This one was applied already, with Jiri's ack.
Its in
https://git.kernel.org/cgit/linux/kernel/git/acme/linux.git/log/?h=perf/core
Will be sent to Ingo in the next pull req I'll make.
- Arnaldo
> tools/perf/util/parse-events.c | 9 ++++-----
> tools/perf/util/pmu.c | 38 +++++++++++++++++++++++---------------
> tools/perf/util/pmu.h | 7 ++++++-
> 3 files changed, 33 insertions(+), 21 deletions(-)
>
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 61be3e695ec2..9522cf22ad81 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -634,10 +634,9 @@ int parse_events_add_pmu(struct list_head *list, int *idx,
> char *name, struct list_head *head_config)
> {
> struct perf_event_attr attr;
> + struct perf_pmu_info info;
> struct perf_pmu *pmu;
> struct perf_evsel *evsel;
> - const char *unit;
> - double scale;
>
> pmu = perf_pmu__find(name);
> if (!pmu)
> @@ -656,7 +655,7 @@ int parse_events_add_pmu(struct list_head *list, int *idx,
> return evsel ? 0 : -ENOMEM;
> }
>
> - if (perf_pmu__check_alias(pmu, head_config, &unit, &scale))
> + if (perf_pmu__check_alias(pmu, head_config, &info))
> return -EINVAL;
>
> /*
> @@ -671,8 +670,8 @@ int parse_events_add_pmu(struct list_head *list, int *idx,
> evsel = __add_event(list, idx, &attr, pmu_event_name(head_config),
> pmu->cpus);
> if (evsel) {
> - evsel->unit = unit;
> - evsel->scale = scale;
> + evsel->unit = info.unit;
> + evsel->scale = info.scale;
> }
>
> return evsel ? 0 : -ENOMEM;
> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> index 22a4ad5a927a..93a41ca96b8e 100644
> --- a/tools/perf/util/pmu.c
> +++ b/tools/perf/util/pmu.c
> @@ -210,6 +210,19 @@ static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FI
> return 0;
> }
>
> +static inline bool pmu_alias_info_file(char *name)
> +{
> + size_t len;
> +
> + len = strlen(name);
> + if (len > 5 && !strcmp(name + len - 5, ".unit"))
> + return true;
> + if (len > 6 && !strcmp(name + len - 6, ".scale"))
> + return true;
> +
> + return false;
> +}
> +
> /*
> * Process all the sysfs attributes located under the directory
> * specified in 'dir' parameter.
> @@ -218,7 +231,6 @@ static int pmu_aliases_parse(char *dir, struct list_head *head)
> {
> struct dirent *evt_ent;
> DIR *event_dir;
> - size_t len;
> int ret = 0;
>
> event_dir = opendir(dir);
> @@ -234,13 +246,9 @@ static int pmu_aliases_parse(char *dir, struct list_head *head)
> continue;
>
> /*
> - * skip .unit and .scale info files
> - * parsed in perf_pmu__new_alias()
> + * skip info files parsed in perf_pmu__new_alias()
> */
> - len = strlen(name);
> - if (len > 5 && !strcmp(name + len - 5, ".unit"))
> - continue;
> - if (len > 6 && !strcmp(name + len - 6, ".scale"))
> + if (pmu_alias_info_file(name))
> continue;
>
> snprintf(path, PATH_MAX, "%s/%s", dir, name);
> @@ -645,7 +653,7 @@ static int check_unit_scale(struct perf_pmu_alias *alias,
> * defined for the alias
> */
> int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
> - const char **unit, double *scale)
> + struct perf_pmu_info *info)
> {
> struct parse_events_term *term, *h;
> struct perf_pmu_alias *alias;
> @@ -655,8 +663,8 @@ int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
> * Mark unit and scale as not set
> * (different from default values, see below)
> */
> - *unit = NULL;
> - *scale = 0.0;
> + info->unit = NULL;
> + info->scale = 0.0;
>
> list_for_each_entry_safe(term, h, head_terms, list) {
> alias = pmu_find_alias(pmu, term);
> @@ -666,7 +674,7 @@ int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
> if (ret)
> return ret;
>
> - ret = check_unit_scale(alias, unit, scale);
> + ret = check_unit_scale(alias, &info->unit, &info->scale);
> if (ret)
> return ret;
>
> @@ -679,11 +687,11 @@ int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
> * set defaults as for evsel
> * unit cannot left to NULL
> */
> - if (*unit == NULL)
> - *unit = "";
> + if (info->unit == NULL)
> + info->unit = "";
>
> - if (*scale == 0.0)
> - *scale = 1.0;
> + if (info->scale == 0.0)
> + info->scale = 1.0;
>
> return 0;
> }
> diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
> index 0f5c0a88fdc8..fe90a012c003 100644
> --- a/tools/perf/util/pmu.h
> +++ b/tools/perf/util/pmu.h
> @@ -25,6 +25,11 @@ struct perf_pmu {
> struct list_head list; /* ELEM */
> };
>
> +struct perf_pmu_info {
> + const char *unit;
> + double scale;
> +};
> +
> struct perf_pmu *perf_pmu__find(const char *name);
> int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
> struct list_head *head_terms);
> @@ -33,7 +38,7 @@ int perf_pmu__config_terms(struct list_head *formats,
> struct list_head *head_terms,
> bool zero);
> int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
> - const char **unit, double *scale);
> + struct perf_pmu_info *info);
> struct list_head *perf_pmu__alias(struct perf_pmu *pmu,
> struct list_head *head_terms);
> int perf_pmu_wrap(void);
> --
> 1.9.3
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