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[RFC][PATCH v9 0/3] perf config: Reimplement perf_config() adding perf_config_init() and perf_config_finish()

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  [RFC][PATCH v9 0/3] perf config: Reimplement perf_config() adding perf_config_init() and perf_config_finish() Taeung Song <treeze.taeung@gmail.com> - 2016-06-20 11:40 +0200
    [RFC][PATCH v9 2/3] perf config: Reimplement perf_config() adding perf_config_init() and perf_config_finish() Taeung Song <treeze.taeung@gmail.com> - 2016-06-20 11:40 +0200

#1426415 — [RFC][PATCH v9 0/3] perf config: Reimplement perf_config() adding perf_config_init() and perf_config_finish()

Hello, :)

This patchset is to reimplement perf_config() for efficient config management.

Everytime perf_config() is called, perf_config() always read config files.
(i.e. user config '~/.perfconfig' and system config '$(sysconfdir)/perfconfig')

But we need to use 'struct perf_config_set config_set' variable
that already contains all config key-value pairs
to avoid this repetitive work in perf_config().

In other words, if new perf_config() is called,
only first time 'config_set' is initialized
collecting all configs from config files and it work with perf_config_set__iter().

If we do, 'config_set' can be reused wherever using perf_config()
and a feature of old perf_config() is the same as new perf_config()
work without the repetitive work that read the config files.

IMHO, I think this patchset is needed because not only the repetitive work
should be avoided but also in near future, it would be smooth to manage perf configs.

If you give me any feedback, I'd apprecicated it. :)

Thanks,
Taeung

v9:
- add config_set__for_each macro (Arnaldo)
- the source files that only need config.h don't include cache.h (Arnaldo)
- use 'config_set' as a static variable instead of a global variable. (Namhyung)
- add perf_config_init(), perf_config_finish() and perf_config_refresh() (Namhyung)
- remove [PATCH v8 4/5] perf config: Use zfree() instead of free() at perf_config_set__delete()
- rebased onto current acme/perf/core
- applied ([BUGFIX][PATCH v8 1/5] 826424)

v8:
- handle the error about NULL at perf_config_set__delete()
- bring declarations about config from util/config.h to util/config.h
- reimplement show_config() using perf_config_set__iter() instead of perf_config()
- rebased onto perf-core-for-mingo-20160607
- applied ([PATCH v7 1/7] 25d8f48, [PATCH v7 2/7] 8beeb00)

v7:
- fill a missing crumb that assign NULL to 'set' variable in perf_config_set__new()
  (Arnaldo)
- two patches applied ([PATCH v6 1/9] 78f71c9, [PATCH v6 3/9] 7db91f2)

v6:
- add printing error message when perf_config_set__iter() is failed
- modify commit messages for bugfix 1~3 (PATCH 1/9 ~ 3/9)
  to help reviewers easily understand why them is needed

v5:
- solve the leak when perf_config_set__init() failed (Arnaldo)
  (to clear the problem it is needed to apply the bottom bugfix 1~3 patches)
- bugfix 1) fix the problem of abnormal terminaltion at perf_parse_file() called by perf_config()
- bugfix 2) if failed at collect_config(), finally free a config set
            after it is done instead of freeing the config set in the function
- bugfix 3) handle NULL pointer exception of 'set' at collect_config()

v4:
- Keep perf_config_set__delete() as it is (Arnaldo)
- Remove perf_config_set__check() (Arnaldo)
- Keep the existing code about the config set at cmd_config() (Arnaldo)

v3:
- add freeing config set after sub-command work at run_builtin() (Namhyung)
- remove needless code about the config set at cmd_config()
- add a patch about a global variable 'config_set'

v2:
- split a patch into several patches
- reimplement show_config() using new perf_config()
- modify perf_config_set__delete using global variable 'config_set'
- reset config set when only 'config' sub-commaned work
  because of options for config file location

Taeung Song (3):
  perf config: Bring declarations about config from util/cache.h to
    util/config.h
  perf config: Reimplement perf_config() adding perf_config_init() and
    perf_config_finish()
  perf config: Reimplement show_config() using config_set__for_each

 tools/perf/builtin-config.c        | 21 ++++-----
 tools/perf/builtin-help.c          |  2 +-
 tools/perf/builtin-kmem.c          |  2 +-
 tools/perf/builtin-record.c        |  1 +
 tools/perf/builtin-report.c        |  2 +-
 tools/perf/builtin-top.c           |  2 +-
 tools/perf/perf.c                  |  4 +-
 tools/perf/ui/browser.c            |  2 +-
 tools/perf/ui/browsers/annotate.c  |  1 +
 tools/perf/util/alias.c            |  1 +
 tools/perf/util/cache.h            | 12 -----
 tools/perf/util/color.c            |  1 +
 tools/perf/util/config.c           | 92 +++++++++++++++++++-------------------
 tools/perf/util/config.h           | 41 +++++++++++++++++
 tools/perf/util/help-unknown-cmd.c |  1 +
 tools/perf/util/intel-pt.c         |  1 +
 16 files changed, 111 insertions(+), 75 deletions(-)

-- 
2.5.0

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#1426431 — [RFC][PATCH v9 2/3] perf config: Reimplement perf_config() adding perf_config_init() and perf_config_finish()

Many sub-commands use perf_config() so
everytime perf_config() is called, perf_config() always read config files.
(i.e. user config '~/.perfconfig' and system config '$(sysconfdir)/perfconfig')

But we need to use the config set that already contains all config
key-value pairs to avoid this repetitive work reading the config files
in perf_config(). (the config set mean a static variable 'config_set')

In other words, if new perf_config_init() is called,
only first time 'config_set' is initialized collecting all configs from the config files.
And then we could use new perf_config() like old perf_config().
When a sub-command finished, free the config set by perf_config_finish() at run_builtin().

If we do, 'config_set' can be reused wherever perf_config() is called
and a feature of old perf_config() is the same as new perf_config() work
without the repetitive work that read the config files.

In summary, in order to use features about configuration,
we can call the functions from outside as below.

    # initialize a config set
    perf_config_init()

    # configure actual variables from a config set
    perf_config()

    # eliminate allocated config set
    perf_config_finish()

    # destroy existing config set and initialize a new config set.
    perf_config_refresh()

Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
 tools/perf/builtin-config.c |  4 ++
 tools/perf/perf.c           |  2 +
 tools/perf/util/config.c    | 92 +++++++++++++++++++++++----------------------
 tools/perf/util/config.h    | 29 ++++++++++++++
 4 files changed, 82 insertions(+), 45 deletions(-)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index fe1b77f..cfd1036 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -80,6 +80,10 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 	else if (use_user_config)
 		config_exclusive_filename = user_config;
 
+	/*
+	 * At only 'config' sub-command, individually use the config set
+	 * because of reinitializing with options config file location.
+	 */
 	set = perf_config_set__new();
 	if (!set) {
 		ret = -1;
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 35553c7..894bf5d0 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -391,6 +391,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 
 	perf_env__set_cmdline(&perf_env, argc, argv);
 	status = p->fn(argc, argv, prefix);
+	perf_config_finish();
 	exit_browser(status);
 	perf_env__exit(&perf_env);
 	bpf__clear();
@@ -558,6 +559,7 @@ int main(int argc, const char **argv)
 
 	srandom(time(NULL));
 
+	perf_config_init();
 	perf_config(perf_default_config, NULL);
 	set_buildid_dir(NULL);
 
diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index 31e09a4..5b50134 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -26,6 +26,7 @@ static FILE *config_file;
 static const char *config_file_name;
 static int config_linenr;
 static int config_file_eof;
+static struct perf_config_set *config_set;
 
 const char *config_exclusive_filename;
 
@@ -478,51 +479,6 @@ static int perf_config_global(void)
 	return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
 }
 
-int perf_config(config_fn_t fn, void *data)
-{
-	int ret = -1;
-	const char *home = NULL;
-
-	/* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
-	if (config_exclusive_filename)
-		return perf_config_from_file(fn, config_exclusive_filename, data);
-	if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
-		if (perf_config_from_file(fn, perf_etc_perfconfig(), data) < 0)
-			goto out;
-	}
-
-	home = getenv("HOME");
-	if (perf_config_global() && home) {
-		char *user_config = strdup(mkpath("%s/.perfconfig", home));
-		struct stat st;
-
-		if (user_config == NULL) {
-			warning("Not enough memory to process %s/.perfconfig, "
-				"ignoring it.", home);
-			goto out;
-		}
-
-		if (stat(user_config, &st) < 0)
-			goto out_free;
-
-		if (st.st_uid && (st.st_uid != geteuid())) {
-			warning("File %s not owned by current user or root, "
-				"ignoring it.", user_config);
-			goto out_free;
-		}
-
-		if (!st.st_size)
-			goto out_free;
-
-		ret = perf_config_from_file(fn, user_config, data);
-
-out_free:
-		free(user_config);
-	}
-out:
-	return ret;
-}
-
 static struct perf_config_section *find_section(struct list_head *sections,
 						const char *section_name)
 {
@@ -706,6 +662,52 @@ struct perf_config_set *perf_config_set__new(void)
 	return set;
 }
 
+int perf_config(config_fn_t fn, void *data)
+{
+	int ret = 0;
+	char key[BUFSIZ];
+	struct perf_config_section *section;
+	struct perf_config_item *item;
+
+	if (config_set == NULL)
+		return -1;
+
+	config_set__for_each(config_set, section, item) {
+		char *value = item->value;
+
+		if (value) {
+			scnprintf(key, sizeof(key), "%s.%s",
+				  section->name, item->name);
+			ret = fn(key, value, data);
+			if (ret < 0) {
+				pr_err("Error: wrong config key-value pair %s=%s\n",
+				       key, value);
+				break;
+			}
+		}
+	}
+
+	return ret;
+}
+
+void perf_config_init(void)
+{
+	if (config_set == NULL)
+		config_set = perf_config_set__new();
+}
+
+void perf_config_finish(void)
+{
+	perf_config_set__delete(config_set);
+	config_set = NULL;
+}
+
+void perf_config_refresh(void)
+{
+	perf_config_finish();
+	perf_config_init();
+}
+
 static void perf_config_item__delete(struct perf_config_item *item)
 {
 	zfree(&item->name);
diff --git a/tools/perf/util/config.h b/tools/perf/util/config.h
index 35ccddb..e540201 100644
--- a/tools/perf/util/config.h
+++ b/tools/perf/util/config.h
@@ -34,5 +34,34 @@ 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);
+void perf_config_init(void);
+void perf_config_finish(void);
+void perf_config_refresh(void);
+
+/**
+ * config_sections__for_each - iterate thru all the sections
+ * @list: list_head instance to iterate
+ * @section: struct perf_config_section iterator
+ */
+#define config_sections__for_each(list, section)	\
+        list_for_each_entry(section, list, node)
+
+/**
+ * config_items__for_each - iterate thru all the items
+ * @list: list_head instance to iterate
+ * @item: struct perf_config_item iterator
+ */
+#define config_items__for_each(list, item)	\
+        list_for_each_entry(item, list, node)
+
+/**
+ * config_set__for_each - iterate thru all the config section-item pairs
+ * @set: evlist instance to iterate
+ * @section: struct perf_config_section iterator
+ * @item: struct perf_config_item iterator
+ */
+#define config_set__for_each(set, section, item)			\
+	config_sections__for_each(&set->sections, section)		\
+	config_items__for_each(&section->items, item)
 
 #endif /* __PERF_CONFIG_H */
-- 
2.5.0

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