Re: [PATCH v6 7/7] tr2: dump names if config exist in multiple scopes

> When we specify GIT_TRACE2_CONFIG_PARAMS or trace2.configparams,
> trace2 will prints "interesting" config values to log. Sometimes,
> when a config set in multiple scope files, the following output
> looks like (the irrelevant fields are omitted here as "..."):
> 
> ...| def_param    |  ...  | core.multipackindex:false
> ...| def_param    |  ...  | core.multipackindex:false
> ...| def_param    |  ...  | core.multipackindex:false
> 
> As the log shows, even each config in different scope is dumped, but
> we don't know which scope it comes from. Therefore, it's better to
> add the scope names as well to make them be more recognizable. For
> example, when execute:
> 
>      $ GIT_TRACE2_PERF=1 \
>      > GIT_TRACE2_CONFIG_PARAMS=core.multipackIndex \
>      > git rev-list --test-bitmap HEAD"
> 
> The following is the ouput (the irrelevant fields are omitted here
> as "..."):
> 
> Format normal:
> ... git.c:461 ... def_param scope:system core.multipackindex=false
> ... git.c:461 ... def_param scope:global core.multipackindex=false
> ... git.c:461 ... def_param scope:local core.multipackindex=false
> 
> Format perf:
> 
> ... | def_param    | ... | scope:system | core.multipackindex:false
> ... | def_param    | ... | scope:global | core.multipackindex:false
> ... | def_param    | ... | scope:local  | core.multipackindex:false
> 
> Format event:
> 
> {"event":"def_param", ... ,"scope":"system","param":"core.multipackindex","value":"false"}
> {"event":"def_param", ... ,"scope":"global","param":"core.multipackindex","value":"false"}
> {"event":"def_param", ... ,"scope":"local","param":"core.multipackindex","value":"false"}
> 
> Signed-off-by: Teng Long <dyroneteng@gmail.com>
> ---
>   trace2/tr2_tgt_event.c  | 3 +++
>   trace2/tr2_tgt_normal.c | 5 ++++-
>   trace2/tr2_tgt_perf.c   | 9 +++++++--
>   3 files changed, 14 insertions(+), 3 deletions(-)
> 
> diff --git a/trace2/tr2_tgt_event.c b/trace2/tr2_tgt_event.c
> index c5c8cfbbaa..37a3163be1 100644
> --- a/trace2/tr2_tgt_event.c
> +++ b/trace2/tr2_tgt_event.c
> @@ -479,9 +479,12 @@ static void fn_param_fl(const char *file, int line, const char *param,
>   {
>   	const char *event_name = "def_param";
>   	struct json_writer jw = JSON_WRITER_INIT;
> +	enum config_scope scope = current_config_scope();
> +	const char *scope_name = config_scope_name(scope);
>   
>   	jw_object_begin(&jw, 0);
>   	event_fmt_prepare(event_name, file, line, NULL, &jw);
> +	jw_object_string(&jw, "scope", scope_name);
>   	jw_object_string(&jw, "param", param);
>   	jw_object_string(&jw, "value", value);
>   	jw_end(&jw);
> diff --git a/trace2/tr2_tgt_normal.c b/trace2/tr2_tgt_normal.c
> index c42fbade7f..69f8033077 100644
> --- a/trace2/tr2_tgt_normal.c
> +++ b/trace2/tr2_tgt_normal.c
> @@ -298,8 +298,11 @@ static void fn_param_fl(const char *file, int line, const char *param,
>   			const char *value)
>   {
>   	struct strbuf buf_payload = STRBUF_INIT;
> +	enum config_scope scope = current_config_scope();
> +	const char *scope_name = config_scope_name(scope);
>   
> -	strbuf_addf(&buf_payload, "def_param %s=%s", param, value);
> +	strbuf_addf(&buf_payload, "def_param scope:%s %s=%s", scope_name, param,
> +		    value);
>   	normal_io_write_fl(file, line, &buf_payload);
>   	strbuf_release(&buf_payload);
>   }
> diff --git a/trace2/tr2_tgt_perf.c b/trace2/tr2_tgt_perf.c
> index a1eff8bea3..8cb792488c 100644
> --- a/trace2/tr2_tgt_perf.c
> +++ b/trace2/tr2_tgt_perf.c
> @@ -441,12 +441,17 @@ static void fn_param_fl(const char *file, int line, const char *param,
>   {
>   	const char *event_name = "def_param";
>   	struct strbuf buf_payload = STRBUF_INIT;
> +	struct strbuf scope_payload = STRBUF_INIT;
> +	enum config_scope scope = current_config_scope();
> +	const char *scope_name = config_scope_name(scope);
>   
>   	strbuf_addf(&buf_payload, "%s:%s", param, value);
> +	strbuf_addf(&scope_payload, "%s:%s", "scope", scope_name);
>   
> -	perf_io_write_fl(file, line, event_name, NULL, NULL, NULL, NULL,
> -			 &buf_payload);
> +	perf_io_write_fl(file, line, event_name, NULL, NULL, NULL,
> +			 scope_payload.buf, &buf_payload);
>   	strbuf_release(&buf_payload);
> +	strbuf_release(&scope_payload);
>   }
>   
>   static void fn_repo_fl(const char *file, int line,
>