'list-all' option is to display both current config variables
and all possible config variables with default values.
The syntax examples are like below

    perf config [<file-option>] [options]

    display all perf config with default values.
    # perf config -a | --list-all

Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Jiri Olsa <jo...@kernel.org>
Signed-off-by: Taeung Song <treeze.tae...@gmail.com>
---
 tools/perf/Documentation/perf-config.txt |   6 +
 tools/perf/builtin-config.c              | 231 ++++++++++++++++++++++++++++++-
 2 files changed, 235 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-config.txt 
b/tools/perf/Documentation/perf-config.txt
index 15949e2..d9fb8c3 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -9,6 +9,8 @@ SYNOPSIS
 --------
 [verse]
 'perf config' [<file-option>] -l | --list
+or
+'perf config' [<file-option>] -a | --list-all
 
 DESCRIPTION
 -----------
@@ -29,6 +31,10 @@ OPTIONS
        For writing and reading options: write to system-wide
        '$(sysconfdir)/perfconfig' or read it.
 
+-a::
+--list-all::
+       Show current and all possible config variables with default values.
+
 CONFIGURATION FILE
 ------------------
 
diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index c43234e..8a63119 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -21,17 +21,160 @@ static const char * const config_usage[] = {
 };
 
 enum actions {
-       ACTION_LIST = 1
+       ACTION_LIST = 1,
+       ACTION_LIST_ALL
 } actions;
 
 static struct option config_options[] = {
        OPT_SET_UINT('l', "list", &actions,
                     "show current config variables", ACTION_LIST),
+       OPT_SET_UINT('a', "list-all", &actions,
+                    "show current and all possible config"
+                    " variables with default values", ACTION_LIST_ALL),
        OPT_BOOLEAN(0, "system", &use_system_config, "use system config file"),
        OPT_BOOLEAN(0, "user", &use_user_config, "use user config file"),
        OPT_END()
 };
 
+enum config_idx {
+       CONFIG_COLORS_TOP,
+       CONFIG_COLORS_MEDIUM,
+       CONFIG_COLORS_NORMAL,
+       CONFIG_COLORS_SELECTED,
+       CONFIG_COLORS_JUMP_ARROWS,
+       CONFIG_COLORS_ADDR,
+       CONFIG_COLORS_ROOT,
+       CONFIG_TUI_REPORT,
+       CONFIG_TUI_ANNOTATE,
+       CONFIG_TUI_TOP,
+       CONFIG_BUILDID_DIR,
+       CONFIG_ANNOTATE_HIDE_SRC_CODE,
+       CONFIG_ANNOTATE_USE_OFFSET,
+       CONFIG_ANNOTATE_JUMP_ARROWS,
+       CONFIG_ANNOTATE_SHOW_NR_JUMPS,
+       CONFIG_ANNOTATE_SHOW_LINENR,
+       CONFIG_ANNOTATE_SHOW_TOTAL_PERIOD,
+       CONFIG_GTK_ANNOTATE,
+       CONFIG_GTK_REPORT,
+       CONFIG_GTK_TOP,
+       CONFIG_PAGER_CMD,
+       CONFIG_PAGER_REPORT,
+       CONFIG_PAGER_ANNOTATE,
+       CONFIG_PAGER_TOP,
+       CONFIG_PAGER_DIFF,
+       CONFIG_HELP_FORMAT,
+       CONFIG_HELP_AUTOCORRECT,
+       CONFIG_HIST_PERCENTAGE,
+       CONFIG_UI_SHOW_HEADERS,
+       CONFIG_CALL_GRAPH_RECORD_MODE,
+       CONFIG_CALL_GRAPH_DUMP_SIZE,
+       CONFIG_CALL_GRAPH_PRINT_TYPE,
+       CONFIG_CALL_GRAPH_ORDER,
+       CONFIG_CALL_GRAPH_SORT_KEY,
+       CONFIG_CALL_GRAPH_THRESHOLD,
+       CONFIG_CALL_GRAPH_PRINT_LIMIT,
+       CONFIG_REPORT_GROUP,
+       CONFIG_REPORT_CHILDREN,
+       CONFIG_REPORT_PERCENT_LIMIT,
+       CONFIG_REPORT_QUEUE_SIZE,
+       CONFIG_TOP_CHILDREN,
+       CONFIG_MAN_VIEWER,
+       CONFIG_KMEM_DEFAULT,
+};
+
+enum config_type {
+       CONFIG_TYPE_BOOL,
+       CONFIG_TYPE_INT,
+       CONFIG_TYPE_LONG,
+       CONFIG_TYPE_U64,
+       CONFIG_TYPE_FLOAT,
+       CONFIG_TYPE_DOUBLE,
+       CONFIG_TYPE_STRING,
+       /* special type */
+       CONFIG_END
+};
+
+struct config_item {
+       const char *section;
+       const char *name;
+       union {
+               bool b;
+               int i;
+               u32 l;
+               u64 ll;
+               float f;
+               double d;
+               const char *s;
+       } value;
+       enum config_type type;
+};
+
+#define CONF_VAR(_sec, _name, _field, _val, _type) \
+       { .section = _sec, .name = _name, .value._field = _val, .type = _type }
+
+#define CONF_BOOL_VAR(_idx, _sec, _name, _val) \
+       [CONFIG_##_idx] = CONF_VAR(_sec, _name, b, _val, CONFIG_TYPE_BOOL)
+#define CONF_INT_VAR(_idx, _sec, _name, _val) \
+       [CONFIG_##_idx] = CONF_VAR(_sec, _name, i, _val, CONFIG_TYPE_INT)
+#define CONF_LONG_VAR(_idx, _sec, _name, _val) \
+       [CONFIG_##_idx] = CONF_VAR(_sec, _name, l, _val, CONFIG_TYPE_LONG)
+#define CONF_U64_VAR(_idx, _sec, _name, _val) \
+       [CONFIG_##_idx] = CONF_VAR(_sec, _name, ll, _val, CONFIG_TYPE_U64)
+#define CONF_FLOAT_VAR(_idx, _sec, _name, _val) \
+       [CONFIG_##_idx] = CONF_VAR(_sec, _name, f, _val, CONFIG_TYPE_FLOAT)
+#define CONF_DOUBLE_VAR(_idx, _sec, _name, _val) \
+       [CONFIG_##_idx] = CONF_VAR(_sec, _name, d, _val, CONFIG_TYPE_DOUBLE)
+#define CONF_STR_VAR(_idx, _sec, _name, _val) \
+       [CONFIG_##_idx] = CONF_VAR(_sec, _name, s, _val, CONFIG_TYPE_STRING)
+#define CONF_END() { .type = CONFIG_END }
+
+struct config_item default_configs[] = {
+       CONF_STR_VAR(COLORS_TOP, "colors", "top", "red, default"),
+       CONF_STR_VAR(COLORS_MEDIUM, "colors", "medium", "green, default"),
+       CONF_STR_VAR(COLORS_NORMAL, "colors", "normal", "lightgray, default"),
+       CONF_STR_VAR(COLORS_SELECTED, "colors", "selected", "white, lightgray"),
+       CONF_STR_VAR(COLORS_JUMP_ARROWS, "colors", "jump_arrows", "blue, 
default"),
+       CONF_STR_VAR(COLORS_ADDR, "colors", "addr", "magenta, default"),
+       CONF_STR_VAR(COLORS_ROOT, "colors", "root", "white, blue"),
+       CONF_BOOL_VAR(TUI_REPORT, "tui", "report", true),
+       CONF_BOOL_VAR(TUI_ANNOTATE, "tui", "annotate", true),
+       CONF_BOOL_VAR(TUI_TOP, "tui", "top", true),
+       CONF_STR_VAR(BUILDID_DIR, "buildid", "dir", "~/.debug"),
+       CONF_BOOL_VAR(ANNOTATE_HIDE_SRC_CODE, "annotate", "hide_src_code", 
false),
+       CONF_BOOL_VAR(ANNOTATE_USE_OFFSET, "annotate", "use_offset", true),
+       CONF_BOOL_VAR(ANNOTATE_JUMP_ARROWS, "annotate", "jump_arrows", true),
+       CONF_BOOL_VAR(ANNOTATE_SHOW_NR_JUMPS, "annotate", "show_nr_jumps", 
false),
+       CONF_BOOL_VAR(ANNOTATE_SHOW_LINENR, "annotate", "show_linenr", false),
+       CONF_BOOL_VAR(ANNOTATE_SHOW_TOTAL_PERIOD, "annotate", 
"show_total_period", false),
+       CONF_BOOL_VAR(GTK_ANNOTATE, "gtk", "annotate", false),
+       CONF_BOOL_VAR(GTK_REPORT, "gtk", "report", false),
+       CONF_BOOL_VAR(GTK_TOP, "gtk", "top", false),
+       CONF_BOOL_VAR(PAGER_CMD, "pager", "cmd", true),
+       CONF_BOOL_VAR(PAGER_REPORT, "pager", "report", true),
+       CONF_BOOL_VAR(PAGER_ANNOTATE, "pager", "annotate", true),
+       CONF_BOOL_VAR(PAGER_TOP, "pager", "top", true),
+       CONF_BOOL_VAR(PAGER_DIFF, "pager", "diff", true),
+       CONF_STR_VAR(HELP_FORMAT, "help", "format", "man"),
+       CONF_INT_VAR(HELP_AUTOCORRECT, "help", "autocorrect", 0),
+       CONF_STR_VAR(HIST_PERCENTAGE, "hist", "percentage", "absolute"),
+       CONF_BOOL_VAR(UI_SHOW_HEADERS, "ui", "show-headers", true),
+       CONF_STR_VAR(CALL_GRAPH_RECORD_MODE, "call-graph", "record-mode", "fp"),
+       CONF_LONG_VAR(CALL_GRAPH_DUMP_SIZE, "call-graph", "dump-size", 8192),
+       CONF_STR_VAR(CALL_GRAPH_PRINT_TYPE, "call-graph", "print-type", 
"graph"),
+       CONF_STR_VAR(CALL_GRAPH_ORDER, "call-graph", "order", "callee"),
+       CONF_STR_VAR(CALL_GRAPH_SORT_KEY, "call-graph", "sort-key", "function"),
+       CONF_DOUBLE_VAR(CALL_GRAPH_THRESHOLD, "call-graph", "threshold", 0.5),
+       CONF_LONG_VAR(CALL_GRAPH_PRINT_LIMIT, "call-graph", "print-limit", 0),
+       CONF_BOOL_VAR(REPORT_GROUP, "report", "group", true),
+       CONF_BOOL_VAR(REPORT_CHILDREN, "report", "children", true),
+       CONF_FLOAT_VAR(REPORT_PERCENT_LIMIT, "report", "percent-limit", 0),
+       CONF_U64_VAR(REPORT_QUEUE_SIZE, "report", "queue-size", 0),
+       CONF_BOOL_VAR(TOP_CHILDREN, "top", "children", true),
+       CONF_STR_VAR(MAN_VIEWER, "man", "viewer", "man"),
+       CONF_STR_VAR(KMEM_DEFAULT, "kmem", "default", "slab"),
+       CONF_END()
+};
+
 static struct config_section *find_section(struct list_head *sections,
                                           const char *section_name)
 {
@@ -112,6 +255,78 @@ static int add_element(struct list_head *head,
        return 0;
 }
 
+static char *get_value(struct config_item *config)
+{
+       int ret = 0;
+       char *value;
+
+       if (config->type == CONFIG_TYPE_BOOL)
+               ret = asprintf(&value, "%s",
+                              config->value.b ? "true" : "false");
+       else if (config->type == CONFIG_TYPE_INT)
+               ret = asprintf(&value, "%d", config->value.i);
+       else if (config->type == CONFIG_TYPE_LONG)
+               ret = asprintf(&value, "%u", config->value.l);
+       else if (config->type == CONFIG_TYPE_U64)
+               ret = asprintf(&value, "%"PRId64, config->value.ll);
+       else if (config->type == CONFIG_TYPE_FLOAT)
+               ret = asprintf(&value, "%f", config->value.f);
+       else if (config->type == CONFIG_TYPE_DOUBLE)
+               ret = asprintf(&value, "%f", config->value.d);
+       else
+               ret = asprintf(&value, "%s", config->value.s);
+
+       if (ret < 0)
+               return NULL;
+
+       return value;
+}
+
+static int show_all_config(struct list_head *sections)
+{
+       int i;
+       bool has_config;
+       struct config_section *section;
+       struct config_element *element;
+
+       for (i = 0; default_configs[i].type != CONFIG_END; i++) {
+               struct config_item *config = &default_configs[i];
+
+               find_config(sections, &section, &element,
+                           config->section, config->name);
+
+               if (!element) {
+                       char *value = get_value(config);
+
+                       printf("%s.%s=%s\n", config->section, config->name, 
value);
+                       free(value);
+               } else
+                       printf("%s.%s=%s\n", section->name,
+                              element->name, element->value);
+       }
+
+       /* Print config variables the default configsets haven't */
+       list_for_each_entry(section, sections, list) {
+               list_for_each_entry(element, &section->element_head, list) {
+                       has_config = false;
+                       for (i = 0; default_configs[i].type != CONFIG_END; i++) 
{
+                               struct config_item *config = 
&default_configs[i];
+
+                               if (!strcmp(config->section, section->name) &&
+                                   !strcmp(config->name, element->name)) {
+                                       has_config = true;
+                                       break;
+                               }
+                       }
+                       if (!has_config)
+                               printf("%s.%s=%s\n", section->name,
+                                      element->name, element->value);
+               }
+       }
+
+       return 0;
+}
+
 static int collect_current_config(const char *var, const char *value,
                                  void *spec_sections)
 {
@@ -184,6 +399,9 @@ int cmd_config(int argc, const char **argv, const char 
*prefix __maybe_unused)
        struct list_head sections;
        char *user_config = mkpath("%s/.perfconfig", getenv("HOME"));
 
+       set_option_flag(config_options, 'l', "list", PARSE_OPT_EXCLUSIVE);
+       set_option_flag(config_options, 'a', "list-all", PARSE_OPT_EXCLUSIVE);
+
        argc = parse_options(argc, argv, config_options, config_usage,
                             PARSE_OPT_STOP_AT_NON_OPTION);
 
@@ -204,10 +422,19 @@ int cmd_config(int argc, const char **argv, const char 
*prefix __maybe_unused)
        perf_config(collect_current_config, &sections);
 
        switch (actions) {
+       case ACTION_LIST_ALL:
+               if (argc == 0) {
+                       ret = show_all_config(&sections);
+                       break;
+               }
+               /* fall through */
        case ACTION_LIST:
                if (argc) {
                        pr_err("Error: takes no arguments\n");
-                       parse_options_usage(config_usage, config_options, "l", 
1);
+                       if (actions == ACTION_LIST_ALL)
+                               parse_options_usage(config_usage, 
config_options, "a", 1);
+                       else
+                               parse_options_usage(config_usage, 
config_options, "l", 1);
                } else {
                        ret = show_config(&sections);
                        if (ret < 0) {
-- 
2.5.0

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