Re: [PATCH 11/19] perf metric: Compute referenced metrics

kajoljain
2020-07-26T09:19:18Z

On 7/19/20 11:43 PM, Jiri Olsa wrote:
> Adding computation (expr__parse call) of referenced metric at
> the point when it needs to be resolved during the parent metric
> computation.
>
> Once the inner metric is computed, the result is stored and
> used if there's another usage of that metric.
>
> Acked-by: Ian Rogers <irogers@google.com>
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>

Reviewed-By : Kajol Jain<kjain@linux.ibm.com>

Thanks,
Kajol Jain
> ---
> tools/perf/util/expr.c | 31 +++++++++++++++++++++++++++++++
> tools/perf/util/expr.h | 3 +++
> tools/perf/util/expr.y | 4 ++--
> 3 files changed, 36 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
> index d3997c2b4a90..a346ca590513 100644
> --- a/tools/perf/util/expr.c
> +++ b/tools/perf/util/expr.c
> @@ -112,6 +112,7 @@ int expr__add_ref(struct expr_parse_ctx *ctx, struct metric_ref *ref)
> */
> data_ptr->ref.metric_name = ref->metric_name;
> data_ptr->ref.metric_expr = ref->metric_expr;
> + data_ptr->ref.counted = false;
> data_ptr->is_ref = true;
>
> ret = hashmap__set(&ctx->ids, name, data_ptr,
> @@ -133,6 +134,34 @@ int expr__get_id(struct expr_parse_ctx *ctx, const char *id,
> return hashmap__find(&ctx->ids, id, (void **)data) ? 0 : -1;
> }
>
> +int expr__resolve_id(struct expr_parse_ctx *ctx, const char *id,
> + struct expr_id_data **datap)
> +{
> + struct expr_id_data *data;
> +
> + if (expr__get_id(ctx, id, datap) || !*datap) {
> + pr_debug("%s not found\n", id);
> + return -1;
> + }
> +
> + data = *datap;
> +
> + pr_debug2("lookup: is_ref %d, counted %d, val %f: %s\n",
> + data->is_ref, data->ref.counted, data->val, id);
> +
> + if (data->is_ref && !data->ref.counted) {
> + data->ref.counted = true;
> + pr_debug("processing metric: %s ENTRY\n", id);
> + if (expr__parse(&data->val, ctx, data->ref.metric_expr, 1)) {
> + pr_debug("%s failed to count\n", id);
> + return -1;
> + }
> + pr_debug("processing metric: %s EXIT: %f\n", id, data->val);
> + }
> +
> + return 0;
> +}
> +
> void expr__del_id(struct expr_parse_ctx *ctx, const char *id)
> {
> struct expr_id_data *old_val = NULL;
> @@ -173,6 +202,8 @@ __expr__parse(double *val, struct expr_parse_ctx *ctx, const char *expr,
> void *scanner;
> int ret;
>
> + pr_debug2("parsing metric: %s\n", expr);
> +
> ret = expr_lex_init_extra(&scanner_ctx, &scanner);
> if (ret)
> return ret;
> diff --git a/tools/perf/util/expr.h b/tools/perf/util/expr.h
> index 81d04ff7f857..9ed208d93418 100644
> --- a/tools/perf/util/expr.h
> +++ b/tools/perf/util/expr.h
> @@ -23,6 +23,7 @@ struct expr_id_data {
> struct {
> const char *metric_name;
> const char *metric_expr;
> + bool counted;
> } ref;
> };
>
> @@ -42,6 +43,8 @@ int expr__add_id_val(struct expr_parse_ctx *ctx, const char *id, double val);
> int expr__add_ref(struct expr_parse_ctx *ctx, struct metric_ref *ref);
> int expr__get_id(struct expr_parse_ctx *ctx, const char *id,
> struct expr_id_data **data);
> +int expr__resolve_id(struct expr_parse_ctx *ctx, const char *id,
> + struct expr_id_data **datap);
> int expr__parse(double *final_val, struct expr_parse_ctx *ctx,
> const char *expr, int runtime);
> int expr__find_other(const char *expr, const char *one,
> diff --git a/tools/perf/util/expr.y b/tools/perf/util/expr.y
> index 0d4f5d324be7..d34b370391c6 100644
> --- a/tools/perf/util/expr.y
> +++ b/tools/perf/util/expr.y
> @@ -88,11 +88,11 @@ expr: NUMBER
> | ID {
> struct expr_id_data *data;
>
> - if (expr__get_id(ctx, $1, &data) || !data) {
> - pr_debug("%s not found\n", $1);
> + if (expr__resolve_id(ctx, $1, &data)) {
> free($1);
> YYABORT;
> }
> +
> $$ = data->val;
> free($1);
> }
>