Commit c6fc018a authored by Taeung Song's avatar Taeung Song Committed by Arnaldo Carvalho de Melo
Browse files

perf config: Add support setting variables in a config file 



Add setting feature that can add config variables with their values to a
config file (i.e. user or system config file) or modify config key-value
pairs in a config file.  For the syntax examples:

    perf config [<file-option>] [section.name[=value] ...]

e.g. You can set the ui.show-headers to false with

    # perf config ui.show-headers=false

If you want to add or modify several config items, you can do like

    # perf config annotate.show_nr_jumps=false kmem.default=slab

Committer notes:

Testing it:

  $ perf config -l
  top.children=true
  report.children=false
  $
  $ perf config top.children=false
  $ perf config -l
  top.children=false
  report.children=false
  $
  $ perf config kmem.default=slab
  $ perf config -l
  top.children=false
  report.children=false
  kmem.default=slab
  $

Signed-off-by: default avatarTaeung Song <treeze.taeung@gmail.com>
Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Nambong Ha <over3025@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: Wookje Kwon <aweee0@gmail.com>
Link: http://lkml.kernel.org/r/1478241862-31230-5-git-send-email-treeze.taeung@gmail.com


[ Combined patch with docs update with this one ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 36662794

tools/perf/Documentation/perf-config.txt

+18 −1
Original line number Diff line number Diff line
@@ -8,7 +8,7 @@ perf-config - Get and set variables in a configuration file. 
SYNOPSIS

--------

[verse]

'perf config' [<file-option>] [section.name ...]

'perf config' [<file-option>] [section.name[=value] ...]

or

'perf config' [<file-option>] -l | --list
@@ -120,6 +120,23 @@ Given a $HOME/.perfconfig like this: 
		children = true

		group = true



You can hide source code of annotate feature setting the config to false with



	% perf config annotate.hide_src_code=true



If you want to add or modify several config items, you can do like



	% perf config ui.show-headers=false kmem.default=slab



To modify the sort order of report functionality in user config file(i.e. `~/.perfconfig`), do



	% perf config --user report sort-order=srcline



To change colors of selected line to other foreground and background colors

in system config file (i.e. `$(sysconf)/perfconfig`), do



	% perf config --system colors.selected=yellow,green



To query the record mode of call graph, do



	% perf config call-graph.record-mode

tools/perf/builtin-config.c

+62 −6
Original line number Diff line number Diff line
@@ -17,7 +17,7 @@ 
static bool use_system_config, use_user_config;



static const char * const config_usage[] = {

	"perf config [<file-option>] [options] [section.name ...]",

	"perf config [<file-option>] [options] [section.name[=value] ...]",

	NULL

};
@@ -33,6 +33,39 @@ static struct option config_options[] = { 
	OPT_END()

};



static int set_config(struct perf_config_set *set, const char *file_name,

		      const char *var, const char *value)

{

	struct perf_config_section *section = NULL;

	struct perf_config_item *item = NULL;

	const char *first_line = "# this file is auto-generated.";

	FILE *fp;



	if (set == NULL)

		return -1;



	fp = fopen(file_name, "w");

	if (!fp)

		return -1;



	perf_config_set__collect(set, var, value);

	fprintf(fp, "%s\n", first_line);



	/* overwrite configvariables */

	perf_config_items__for_each_entry(&set->sections, section) {

		fprintf(fp, "[%s]\n", section->name);



		perf_config_items__for_each_entry(&section->items, item) {

			if (item->value)

				fprintf(fp, "\t%s = %s\n",

					item->name, item->value);

		}

	}

	fclose(fp);



	return 0;

}



static int show_spec_config(struct perf_config_set *set, const char *var)

{

	struct perf_config_section *section;
@@ -82,7 +115,7 @@ static int show_config(struct perf_config_set *set) 
	return 0;

}



static int parse_config_arg(char *arg, char **var)

static int parse_config_arg(char *arg, char **var, char **value)

{

	const char *last_dot = strchr(arg, '.');
@@ -99,7 +132,21 @@ static int parse_config_arg(char *arg, char **var) 
		return -1;

	}



	*value = strchr(arg, '=');

	if (*value == NULL)

		*var = arg;

	else if (!strcmp(*value, "=")) {

		pr_err("The config variable does not contain a value: %s\n", arg);

		return -1;

	} else {

		*value = *value + 1; /* excluding a first character '=' */

		*var = strsep(&arg, "=");

		if (*var[0] == '\0') {

			pr_err("invalid config variable: %s\n", arg);

			return -1;

		}

	}



	return 0;

}
@@ -153,7 +200,8 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused) 
	default:

		if (argc) {

			for (i = 0; argv[i]; i++) {

				char *var, *arg = strdup(argv[i]);

				char *var, *value;

				char *arg = strdup(argv[i]);



				if (!arg) {

					pr_err("%s: strdup failed\n", __func__);
@@ -161,13 +209,21 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused) 
					break;

				}



				if (parse_config_arg(arg, &var) < 0) {

				if (parse_config_arg(arg, &var, &value) < 0) {

					free(arg);

					ret = -1;

					break;

				}



				if (value == NULL)

					ret = show_spec_config(set, var);

				else {

					const char *config_filename = config_exclusive_filename;



					if (!config_exclusive_filename)

						config_filename = user_config;

					ret = set_config(set, config_filename, var, value);

				}

				free(arg);

			}

		} else

tools/perf/util/config.c

+6 −0
Original line number Diff line number Diff line
@@ -602,6 +602,12 @@ out_free: 
	return -1;

}



int perf_config_set__collect(struct perf_config_set *set,

			     const char *var, const char *value)

{

	return collect_config(var, value, set);

}



static int perf_config_set__init(struct perf_config_set *set)

{

	int ret = -1;

tools/perf/util/config.h

+2 −0
Original line number Diff line number Diff line
@@ -33,6 +33,8 @@ const char *perf_etc_perfconfig(void); 


struct perf_config_set *perf_config_set__new(void);

void perf_config_set__delete(struct perf_config_set *set);

int perf_config_set__collect(struct perf_config_set *set,

			     const char *var, const char *value);

void perf_config__init(void);

void perf_config__exit(void);

void perf_config__refresh(void);

CRA Git | Maintained and supported by SUSTech CRA and CCSE