[PATCH v2 1/4] perf tools: Add 'perf-config' command

[PATCH v2 1/4] perf tools: Add 'perf-config' command

[Taeung Song]

The perf configuration file contains many variables which can make
the perf command's action more effective.
But looking through state of configuration is difficult and there's no knowing
what kind of other variables except variables in perfconfig.example exist.
So This patch adds 'perf-config' command with '--list' option and a document for it.

    perf config [options]

    display current perf config variables.
    # perf config
    or
    # perf config -l | --list

Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
 tools/perf/Build                            |   1 +
 tools/perf/Documentation/perf-config.txt    | 375 ++++++++++++++++++++++++++++
 tools/perf/Documentation/perfconfig.example |  70 +++++-
 tools/perf/builtin-config.c                 |  75 ++++++
 tools/perf/builtin.h                        |   1 +
 tools/perf/command-list.txt                 |   1 +
 tools/perf/perf.c                           |   1 +
 7 files changed, 512 insertions(+), 12 deletions(-)
 create mode 100644 tools/perf/Documentation/perf-config.txt
 create mode 100644 tools/perf/builtin-config.c

diff --git a/tools/perf/Build b/tools/perf/Build
index b77370e..3c1f437 100644
--- a/tools/perf/Build
+++ b/tools/perf/Build
@@ -1,5 +1,6 @@
 perf-y += builtin-bench.o
 perf-y += builtin-annotate.o
+perf-y += builtin-config.o
 perf-y += builtin-diff.o
 perf-y += builtin-evlist.o
 perf-y += builtin-help.o
diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
new file mode 100644
index 0000000..afda861
--- /dev/null
+++ b/tools/perf/Documentation/perf-config.txt
@@ -0,0 +1,375 @@
+perf-config(1)
+==============
+
+NAME
+----
+perf-config - Get and set variables in a configuration file.
+
+SYNOPSIS
+--------
+[verse]
+'perf config' -l | --list
+
+DESCRIPTION
+-----------
+You can manage variables in a configuration file with this command.
+
+OPTIONS
+-------
+
+-l::
+--list::
+	Show current config variables with key and value into each sections.
+
+CONFIGURATION FILE
+------------------
+
+The Perf configuration file contains many variables which can make
+the perf command's action more effective.
+The '$HOME/.perfconfig' file is used to store a per-user configuration.
+The file '$(sysconfdir)/perfconfig' can be used to
+store a system-wide default configuration.
+
+The variables are divided into sections. In each section, the variables
+can are composed of a key and value.
+
+Syntax
+~~~~~~
+
+The file consists of sections and names. A section begins with
+the name of the section in square brackets and continues until the next
+section begins. Each variable have to belong to some section, which means
+there must be a section header before the first setting of a variable, as below:
+Each variable are in the form 'name = value'.
+
+	[section]
+		name1 = value1
+		name2 = value2
+
+Section names are case sensitive and can contain any characters except
+newline (doublequote `"` and backslash have to be escaped as `\"` and `\\`,
+respectively).  Section headers can't span multiple
+lines.  Variables may belong directly to a section.
+
+Example
+~~~~~~~
+
+Given a $HOME/.perfconfig like this:
+
+#
+# This is the config file, and
+# a '#' and ';' character indicates a comment
+#
+
+[colors]
+	# Color variables
+	top = red, default
+	medium = green, default
+	normal = lightgray, default
+	selected = white, lightgray
+	code = blue, default
+	addr = magenta, default
+	root = white, blue
+
+[tui]
+	# Defaults if linked with libslang
+	report = on
+	annotate = on
+	top = on
+
+[buildid]
+	# Default, disable using /dev/null
+	dir = ~/.debug
+
+[annotate]
+	# Defaults
+	hide_src_code = false
+	use_offset = true
+	jump_arrows = true
+	show_nr_jumps = false
+
+[help]
+	# Format can be man, info, web or html
+	format = man
+	autocorrect = 0
+
+[ui]
+	show-headers= true
+
+[call-graph]
+	# fp (framepointer), dwarf
+	record-mode = fp
+	print-type = graph
+	order = caller
+	sort-key = function
+
+Variables
+~~~~~~~~~
+
+colors.*::
+	Color variables can customize colors of the output which is printed out
+	from ‘report’, ‘top’, ’annotate’ on tui.
+	Color variables are composed of foreground and background
+	and should have two values for them. If you want to keep as colors
+	of your terminal, you should use ‘default’ for the color value.
+	The color names that can be used are:
+	red, green, default, black, blue, white, magenta, lightgray
+
+	colors.top::
+		‘top’ means a overhead percentage which is more than 5%.
+		And values of this variable specify colors of percentage.
+		Basic key values are foreground-color ’red’ and
+		background-color ’default’.
+	colors.medium::
+		‘medium’ means a overhead percentage which has more than 0.5%.
+		Default values are ’green’ and ’default’.
+	colors.normal::
+		‘normal’ means the rest of overhead percentages
+		except ‘top’, ‘medium’, ‘selected’.
+		Default values are ’lightgray’ and ’default’.
+	colors.selected::
+		This selects the colors for the current entry in a list of entries
+		from sub-commands (top,report,annotate).
+		Default values are ’white’ and ’lightgray’.
+	colors.code::
+		Colors for arrows and lines in jumps on  assembly code listings
+		such as ‘jns’,’jmp’,’jane’,etc. Default values are ‘blue’, ‘default’.
+	colors.addr::
+		This selects colors for addresses from ’annotate’.
+		Default values are ‘magenta’, ‘default’.
+	colors.root::
+		Colors for headers in the output of a sub-command ‘top’.
+		Default values are ‘white’, ‘blue’.
+
+tui.*::
+	A boolean value that controls launching TUI browser for each subcommand.
+	By default, TUI is enabled if perf detects the required library during build
+	and this config option can control it.  Available subcommands are 'top',
+	'report' and 'annotate'.
+
+gtk.*::
+	A boolean value that controls launching GTK+2 GUI browser for
+	each subcommand.  By default, TUI is enabled if perf detects the
+	required library during build and this config option can control it.
+	Available subcommands are 'top', 'report' and 'annotate'.
+
+buildid.*::
+	buildid.dir::
+		Each executable or shared library built with each program is assigned
+		a unique identification as build-id. The option means a path where
+		build-id information can be saved.
+		The default is $HOME/.debug
+
+annotate.*::
+	There’re options which work with a ’annotate’ sub-command.
+	This options is in control of addresses, jump function, source code
+	in lines of assembly code from a specific program.
+
+	annotate.hide_src_code::
+		If a program which is analyzed has source code of itself,
+		this option let ‘annotate’ print a list of assembly code with the source code.
+		For example, let’s see a part of a program. There’re four lines.
+		If this option is ‘false’, they can be printed
+		without source code from a program as below.
+
+		│        push   %rbp
+		│        mov    %rsp,%rbp
+		│        sub    $0x10,%rsp
+		│        mov    (%rdi),%rdx
+
+		But if this option is ‘true’, source code of the part
+		can be also printed as below.
+
+		│      struct rb_node *rb_next(const struct rb_node *node)
+		│      {
+		│        push   %rbp
+		│        mov    %rsp,%rbp
+		│        sub    $0x10,%rsp
+		│              struct rb_node *parent;
+		│
+		│              if (RB_EMPTY_NODE(node))
+		│        mov    (%rdi),%rdx
+		│              return n;
+
+        annotate.use_offset::
+		Basing on a first address of a loaded function, offset can be used.
+		Instead of using original addresses of assembly code,
+		addresses subtracted from a base address can be printed.
+		Let’s illustrate a example.
+		If a base address is 0XFFFFFFFF81624d50 as below,
+
+		ffffffff81624d50 <load0>
+
+		a address on assembly code has a specific absolute address as below
+
+		ffffffff816250b8:│  mov    0x8(%r14),%rdi
+
+		but if use_offset is ’true’, a address subtracted from a base address is printed.
+		The default is true.
+
+		             368:│  mov    0x8(%r14),%rdi
+
+	annotate.jump_arrows::
+		There’re jump instruction among assembly code.
+		Depending on a boolean value of jump_arrows,
+		arrows can be printed or not which represent
+		where do the instruction jump into as below.
+
+		│     ┌──jmp    1333
+		│     │  xchg   %ax,%ax
+		│1330:│  mov    %r15,%r10
+		│1333:└─→cmp    %r15,%r14
+
+		If jump_arrow is ‘false’, the arrows isn’t printed as below.
+
+		│      ↓ jmp    1333
+		│        xchg   %ax,%ax
+		│1330:   mov    %r15,%r10
+		│1333:   cmp    %r15,%r14
+
+        annotate.show_nr_jumps::
+		Let’s see a part of assembly code.
+
+		│1382:   movb   $0x1,-0x270(%rbp)
+
+		If use this, the number of branches branching to that address can be printed as below.
+
+		│1 1382:   movb   $0x1,-0x270(%rbp)
+
+help.*::
+	help.format:: = man
+		A format of manual page can be ‘man’, ‘info’, ‘web’ or ‘html’.
+		’man’ is default.
+	help.autocorrect:: = 0
+		Automatically correct and execute mistyped commands after
+		waiting for the given number of deciseconds (0.1 sec).
+		Let's see a example. If a mistyped sub-command is executed like 'perf mistyped-command'
+		and this option is 0, the output is as below.
+
+		perf: 'mistyped-command' is not a perf-command. See 'perf --help’.
+
+		Or if this option is more than 1, the output can be such as.
+
+		WARNING: You called a perf program named 'mistyped-command', which does not exist.
+		Continuing under the assumption that you meant 'with-kcore'
+		in 0.1 seconds automatically...
+		Usage: perf-with-kcore <perf sub-command> <perf.data directory> [<sub-command options> [ -- <workload>]]
+		<perf sub-command> can be record, script, report or inject
+		    or: perf-with-kcore fix_buildid_cache_permissions
+
+hist.*::
+	hist.percentage::
+		This option control a way to calcurate overhead of filtered entries -
+		that means the value of this option is effective only if there's a
+		filter (by comm, dso or symbol name).  Suppose a following example:
+
+		       Overhead  Symbols
+		       ........  .......
+		        33.33%     foo
+		        33.33%     bar
+		        33.33%     baz
+
+	       This is an original overhead and we'll filter out the first 'foo'
+	       entry.  The value of 'relative' would increase the overhead of 'bar'
+	       and 'baz' to 50.00% for each, while 'absolute' would show their
+	       current overhead (33.33%).
+
+ui.*::
+	ui.show-headers::
+		There’re columns as header ‘Overhead’, ‘Children’, ‘Shared Object’, ‘Symbol’, ’self’.
+		If this option is false, they are hiden.
+
+call-graph.*::
+	When sub-commands ‘top’ and ‘report’ work with -g/—-children
+	there’re options in control of call-graph.
+
+	call-graph.record-mode::
+		The record-mode can be ‘fp’ (frame pointer) and ‘dwarf’.
+		The value of 'dwarf' is effective only if perf detect needed library
+		(libunwind or a recent version of libdw).  Also it doesn't *require*
+		the dump-size option since it can use the default value of 8192 if
+		missing.
+
+	call-graph.dump-size::
+		The size of stack to dump in order to do post-unwinding.  Default is 8192 (byte).
+		When using dwarf into record-mode this option should have a value.
+
+	call-graph.print-type::
+		The print-types can be graph (graph absolute), fractal (graph relative), flat.
+		This option controls a way to show overhead for each callchain entry.
+		Suppose a following example.
+
+		Overhead  Symbols
+		........  .......
+		  40.00%  foo
+		      |
+		      --- foo
+		      |
+		      |--50.00%-- bar
+		      |           main
+		      |
+		      --50.00%-- baz
+		                 main
+
+		This output is a default format which is 'fractal'.  The 'foo' came
+		from 'bar' and 'baz' exactly half and half so 'fractal' shows 50.00%
+		for each (meaning that it assumes 100% total overhead of 'foo').
+
+		The 'graph' uses absolute overhead value of 'foo' as total so each of
+		'bar' and 'baz' callchain will have 20.00% of overhead.
+
+	call-graph.order::
+		This option controls print order of callchains.  The default is
+		'callee' which means callee is printed at top and then followed by its
+		caller and so on.  The 'caller' prints it in reverse order.
+
+	call-graph.sort-key::
+		The callchains are merged if they contain same information.
+		The sort-key option determines a way to compare the callchains.
+		A value of 'sort-key' can be 'function' or 'address’.
+		The default is ‘function’.
+
+	call-graph.threshold::
+		When there're many callchains it'd print tons of lines.  So perf omits
+		small callchains under a certain overhead (threshold) and this option
+		control the threashold.  Default is 0.5 (%).
+
+	call-graph.print-limit::
+		This is another way to control the number of callchains printed for a
+		single entry.  Default is 0 which means no limitation.
+
+report.*::
+	report.percent-limit::
+		This one is mostly same as call-graph.threshold but works for
+		histogram entries.  Entries have overhead lower than this percentage
+		will not be printed.  Default is 0.
+		If percent-limit is 70, the output which has percentages of
+		each overhead above 70% can be printed.
+
+	report.queue-size::
+		option to setup the maximum allocation size for session's
+		ordered events queue, if not set there's no default limit.
+
+	report.children::
+		The children means that functions called from another function.
+		If the option is true, accumulate callchain of children and show total overhead.
+		Please refer to the perf-report manual.
+
+top.*::
+	top.children::
+		This option means same as report.children.
+		So it is true, the output of ‘top’ is rearranged by each overhead into children group.
+
+man.*::
+	man.viewer::
+		This option can assign a manual tool with which a subcommand 'help' work.
+		it can used as 'man', 'woman', 'konqueror'. Default value is 'man'.
+
+pager.*::
+	pager.<subcommand>::
+		When a subcommand work as stdio instead of TUI, use pager with it.
+		Default value is 'true'.
+
+SEE ALSO
+--------
+linkperf:perf[1], linkperf:perf-report[1]
diff --git a/tools/perf/Documentation/perfconfig.example b/tools/perf/Documentation/perfconfig.example
index 767ea24..be820b7 100644
--- a/tools/perf/Documentation/perfconfig.example
+++ b/tools/perf/Documentation/perfconfig.example
@@ -1,29 +1,75 @@
 [colors]
-
-	# These were the old defaults
-	top = red, lightgray
-	medium = green, lightgray
-	normal = black, lightgray
-	selected = lightgray, magenta
-	code = blue, lightgray
-	addr = magenta, lightgray
+	# There are types of colors which are red,
+	# green, default, black, blue,
+	# white, magenta, lightgray
+	# The default is like below
+	top = red, default
+	medium = green, default
+	normal = lightgray, default
+	selected = white, lightgray
+	code = blue, default
+	addr = magenta, default
+	root = white, blue
 
 [tui]
-
 	# Defaults if linked with libslang
 	report = on
 	annotate = on
 	top = on
 
 [buildid]
-
 	# Default, disable using /dev/null
-	dir = /root/.debug
+	dir = ~/.debug
 
 [annotate]
-
 	# Defaults
 	hide_src_code = false
 	use_offset = true
 	jump_arrows = true
 	show_nr_jumps = false
+
+[gtk]
+	report = off
+	annotate = off
+	#top = off
+
+[pager]
+	# That a 'cmd' is true mean to use "pager or less"
+	cmd = true
+	report = false
+	diff = true
+
+[help]
+	# Format can be man, info, web or html
+	format = man
+	autocorrect = 0
+
+[hist]
+	# a value of 'percentage' can be 'relative' or 'absolute'
+	percentage = absolute
+
+[ui]
+	show-headers= true
+
+[call-graph]
+	# fp (framepointer), dwarf
+	record-mode = fp
+
+	# graph (graph absolute), flat, fractal (graph relative)
+	print-type = fractal
+
+	# caller, callee
+	order = caller
+
+	# function, address
+	sort-key = function
+
+[report]
+	percent-limit = 1
+	children = false
+
+[top]
+	children = true
+
+[man]
+	viewer = man
diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
new file mode 100644
index 0000000..e7784ed
--- /dev/null
+++ b/tools/perf/builtin-config.c
@@ -0,0 +1,75 @@
+/*
+ * builtin-config.c
+ *
+ * Copyright (C) 2015, Taeung Song <treeze.taeung@gmail.com>
+ *
+ */
+#include "builtin.h"
+
+#include "perf.h"
+
+#include "util/cache.h"
+#include "util/parse-options.h"
+#include "util/util.h"
+#include "util/debug.h"
+
+static int actions;
+
+static const char * const config_usage[] = {
+	"perf config [options]",
+	NULL
+};
+
+#define ACTION_LIST (1<<0)
+
+static const struct option config_options[] = {
+	OPT_GROUP("Action"),
+	OPT_BIT('l', "list", &actions, "show current config variables", ACTION_LIST),
+	OPT_END()
+};
+
+static int show_config(const char *key, const char *value,
+		       void *cb __maybe_unused)
+{
+	if (value)
+		printf("%s=%s\n", key, value);
+	else
+		printf("%s\n", key);
+
+	return 0;
+}
+
+int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
+{
+	int ret = 0;
+	int origin_argc = argc - 1;
+	bool has_option;
+
+	argc = parse_options(argc, argv, config_options, config_usage,
+			     PARSE_OPT_STOP_AT_NON_OPTION);
+	if (origin_argc > argc)
+		has_option = true;
+	else
+		has_option = false;
+
+	switch (actions) {
+	case ACTION_LIST:
+		if (argc == 0)
+			ret = perf_config(show_config, NULL);
+		else
+			goto out_err;
+		goto out;
+	default:
+		if (!has_option && argc == 0) {
+			ret = perf_config(show_config, NULL);
+			goto out;
+		} else
+			goto out_err;
+	}
+
+out_err:
+	pr_warning("Error: Unknown argument.\n");
+	usage_with_options(config_usage, config_options);
+out:
+	return ret;
+}
diff --git a/tools/perf/builtin.h b/tools/perf/builtin.h
index 3688ad2..3f871b5 100644
--- a/tools/perf/builtin.h
+++ b/tools/perf/builtin.h
@@ -17,6 +17,7 @@ extern int cmd_annotate(int argc, const char **argv, const char *prefix);
 extern int cmd_bench(int argc, const char **argv, const char *prefix);
 extern int cmd_buildid_cache(int argc, const char **argv, const char *prefix);
 extern int cmd_buildid_list(int argc, const char **argv, const char *prefix);
+extern int cmd_config(int argc, const char **argv, const char *prefix);
 extern int cmd_diff(int argc, const char **argv, const char *prefix);
 extern int cmd_evlist(int argc, const char **argv, const char *prefix);
 extern int cmd_help(int argc, const char **argv, const char *prefix);
diff --git a/tools/perf/command-list.txt b/tools/perf/command-list.txt
index 00fcaf8..acc3ea7 100644
--- a/tools/perf/command-list.txt
+++ b/tools/perf/command-list.txt
@@ -9,6 +9,7 @@ perf-buildid-cache		mainporcelain common
 perf-buildid-list		mainporcelain common
 perf-data			mainporcelain common
 perf-diff			mainporcelain common
+perf-config			mainporcelain common
 perf-evlist			mainporcelain common
 perf-inject			mainporcelain common
 perf-kmem			mainporcelain common
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index b857fcb..604fa4a 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -37,6 +37,7 @@ struct cmd_struct {
 static struct cmd_struct commands[] = {
 	{ "buildid-cache", cmd_buildid_cache, 0 },
 	{ "buildid-list", cmd_buildid_list, 0 },
+	{ "config",	cmd_config,	0 },
 	{ "diff",	cmd_diff,	0 },
 	{ "evlist",	cmd_evlist,	0 },
 	{ "help",	cmd_help,	0 },
-- 
1.9.1

[PATCH v2 2/4] perf tools: Add functions which can get or set perf config variables.

[Taeung Song]

This patch consists of functions
which can get, set specific config variables.
For the syntax examples,

   perf config [options] [section.name[=value] ...]

   display key-value pairs of specific config variables
   # perf config report.queue-size report.children

   set specific config variables
   # perf config report.queue-size=100M report.children=true

Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
 tools/perf/Documentation/perf-config.txt |   2 +
 tools/perf/builtin-config.c              | 543 ++++++++++++++++++++++++++++++-
 tools/perf/util/cache.h                  |  17 +
 tools/perf/util/config.c                 |  30 +-
 4 files changed, 587 insertions(+), 5 deletions(-)

diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index afda861..f3dae23 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -8,6 +8,8 @@ perf-config - Get and set variables in a configuration file.
 SYNOPSIS
 --------
 [verse]
+'perf config' [section.name[=value] ...]
+or
 'perf config' -l | --list
 
 DESCRIPTION
diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index e7784ed..175b125 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -16,7 +16,7 @@
 static int actions;
 
 static const char * const config_usage[] = {
-	"perf config [options]",
+	"perf config [options] [section.name[=value] ...]",
 	NULL
 };
 
@@ -28,6 +28,346 @@ static const struct option config_options[] = {
 	OPT_END()
 };
 
+/* section names */
+#define COLORS "colors"
+#define TUI "tui"
+#define BUILDID "buildid"
+#define ANNOTATE "annotate"
+#define GTK "gtk"
+#define PAGER "pager"
+#define HELP "help"
+#define HIST "hist"
+#define UI "ui"
+#define CALL_GRAPH "call-graph"
+#define REPORT "report"
+#define TOP "top"
+#define MAN "man"
+
+/* config variable types */
+#define TYPE_INT "int"
+#define TYPE_LONG "long"
+#define TYPE_DIRNAME "dirname"
+#define TYPE_BOOL "bool"
+#define TYPE_ON_OFF "on_off"
+
+static struct default_configset {
+	const char *section_name;
+	const char *name, *value, *type;
+
+} default_configsets[] = {
+	{
+		.section_name = COLORS,
+		.name = "top",
+		.value = "red, default",
+		.type = NULL,
+	},
+	{
+		.section_name = COLORS,
+		.name = "medium",
+		.value = "green, default",
+		.type = NULL,
+	},
+	{
+		.section_name = COLORS,
+		.name = "normal",
+		.value = "lightgray, default",
+		.type = NULL,
+	},
+	{
+		.section_name = COLORS,
+		.name = "selected",
+		.value = "white, lightgray",
+		.type = NULL,
+	},
+	{
+		.section_name = COLORS,
+		.name = "code",
+		.value = "blue, default",
+		.type = NULL,
+	},
+	{
+		.section_name = COLORS,
+		.name = "addr",
+		.value = "magenta, default",
+		.type = NULL,
+	},
+	{
+		.section_name = COLORS,
+		.name = "root",
+		.value = "white, blue",
+		.type = NULL,
+	},
+	{
+		.section_name = TUI,
+		.name = "report",
+		.value = "on",
+		.type = TYPE_ON_OFF,
+	},
+	{
+		.section_name = TUI,
+		.name = "annotate",
+		.value = "on",
+		.type = TYPE_ON_OFF,
+	},
+	{
+		.section_name = TUI,
+		.name = "top",
+		.value = "on",
+		.type = TYPE_ON_OFF,
+	},
+	{
+		.section_name = BUILDID,
+		.name = "dir",
+		.value = "~/.debug",
+		.type = TYPE_DIRNAME,
+	},
+	{
+		.section_name = ANNOTATE,
+		.name = "hide_src_code",
+		.value = "false",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = ANNOTATE,
+		.name = "use_offset",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = ANNOTATE,
+		.name = "jump_arrows",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = ANNOTATE,
+		.name = "show_nr_jumps",
+		.value = "false",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = GTK,
+		.name = "annotate",
+		.value = "off",
+		.type = TYPE_ON_OFF,
+	},
+	{
+		.section_name = GTK,
+		.name = "report",
+		.value = "off",
+		.type = TYPE_ON_OFF,
+	},
+	{
+		.section_name = GTK,
+		.name = "top",
+		.value = "off",
+		.type = TYPE_ON_OFF,
+	},
+	{
+		.section_name = PAGER,
+		.name = "cmd",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = PAGER,
+		.name = "report",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = PAGER,
+		.name = "annotate",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = PAGER,
+		.name = "record",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = PAGER,
+		.name = "top",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = PAGER,
+		.name = "diff",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = HELP,
+		.name = "format",
+		.value = "man",
+		.type = NULL,
+	},
+	{
+		.section_name = HELP,
+		.name = "autocorrect",
+		.value = "0",
+		.type = NULL,
+	},
+	{
+		.section_name = HIST,
+		.name = "percentage",
+		.value = "absolute",
+		.type = NULL,
+	},
+	{
+		.section_name = UI,
+		.name = "show-headers",
+		.value = "true",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = CALL_GRAPH,
+		.name = "record-mode",
+		.value = "fp",
+	},
+	{
+		.section_name = CALL_GRAPH,
+		.name = "dump-size",
+		.value = "8192",
+		.type = TYPE_INT,
+	},
+	{
+		.section_name = CALL_GRAPH,
+		.name = "print-type",
+		.value = "fractal",
+		.type = NULL,
+	},
+	{
+		.section_name = CALL_GRAPH,
+		.name = "order",
+		.value = "caller",
+		.type = NULL,
+	},
+	{
+		.section_name = CALL_GRAPH,
+		.name = "sort-key",
+		.value = "function",
+		.type = NULL,
+	},
+	{
+		.section_name = CALL_GRAPH,
+		.name = "threshold",
+		.value = "0.5",
+		.type = TYPE_LONG,
+	},
+	{
+		.section_name = CALL_GRAPH,
+		.name = "print-limit",
+		.value = "0",
+		.type = TYPE_INT,
+	},
+	{
+		.section_name = REPORT,
+		.name = "children",
+		.value = "false",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = REPORT,
+		.name = "percent-limit",
+		.value = "0",
+		.type = TYPE_INT,
+	},
+	{
+		.section_name = REPORT,
+		.name = "queue-size",
+		.value = "0",
+		.type = TYPE_INT,
+	},
+	{
+		.section_name = TOP,
+		.name = "children",
+		.value = "false",
+		.type = TYPE_BOOL,
+	},
+	{
+		.section_name = MAN,
+		.name = "viewer",
+		.value = "man",
+		.type = NULL,
+	},
+	{
+		.section_name = NULL,
+		.name = NULL,
+		.value = NULL,
+		.type = NULL,
+	},
+};
+
+static struct config_section *find_section(const char *section_name)
+{
+	struct config_section *section_node;
+
+	list_for_each_entry(section_node, &sections, list)
+		if (!strcmp(section_node->name, section_name))
+			return section_node;
+
+	return NULL;
+}
+
+static struct config_element *find_element(const char *name,
+					   struct config_section *section_node)
+{
+	struct config_element *element_node;
+
+	list_for_each_entry(element_node, &section_node->element_head, list)
+		if (!strcmp(element_node->name, name))
+			return element_node;
+
+	return NULL;
+}
+
+static struct config_section *init_section(const char *section_name)
+{
+	struct config_section *section_node;
+
+	section_node = zalloc(sizeof(*section_node));
+	if (!section_node)
+		return NULL;
+
+	INIT_LIST_HEAD(&section_node->element_head);
+	section_node->name = strdup(section_name);
+	if (!section_node->name) {
+		pr_err("%s: strdup failed\n", __func__);
+		free(section_node);
+		return NULL;
+	}
+
+	return section_node;
+}
+
+static int add_element(struct list_head *head,
+			      const char *name, const char *value)
+{
+	struct config_element *element_node;
+
+	element_node = zalloc(sizeof(*element_node));
+	element_node->name = strdup(name);
+	if (!element_node->name) {
+		pr_err("%s: strdup failed\n", __func__);
+		goto out_free;
+	}
+	if (value)
+		element_node->value = (char *)value;
+	else
+		element_node->value = NULL;
+
+	list_add_tail(&element_node->list, head);
+	return 0;
+
+out_free:
+	free(element_node);
+	return -1;
+}
+
 static int show_config(const char *key, const char *value,
 		       void *cb __maybe_unused)
 {
@@ -39,10 +379,193 @@ static int show_config(const char *key, const char *value,
 	return 0;
 }
 
+static void find_config(struct config_section **section_node,
+			struct config_element **element_node,
+			const char *section_name, const char *name)
+{
+	*section_node = find_section(section_name);
+
+	if (*section_node != NULL)
+		*element_node = find_element(name, *section_node);
+	else
+		*element_node = NULL;
+}
+
+static int show_spec_config(const char *section_name, const char *name,
+			    char *value __maybe_unused)
+{
+	int i;
+	struct config_section *section_node = NULL;
+	struct config_element *element_node = NULL;
+	char key[BUFSIZ];
+
+	find_config(&section_node, &element_node, section_name, name);
+
+	if (section_node && element_node) {
+		scnprintf(key, sizeof(key), "%s.%s",
+			  section_node->name, element_node->name);
+		return show_config(key, element_node->value, NULL);
+	}
+
+	for (i = 0; default_configsets[i].section_name != NULL; i++) {
+		if (!strcmp(default_configsets[i].section_name, section_name)
+		    && !strcmp(default_configsets[i].name, name)) {
+			printf("%s.%s=%s\n", default_configsets[i].section_name,
+			       default_configsets[i].name, default_configsets[i].value);
+			return 0;
+		}
+	}
+
+	pr_err("Error: Failed to find the variable.\n");
+
+	return 0;
+}
+
+static char *normalize_value(const char *section_name, const char *name, const char *value)
+{
+	int i;
+	char key[BUFSIZ];
+	char *normalized;
+
+	scnprintf(key, sizeof(key), "%s.%s", section_name, name);
+	for (i = 0; default_configsets[i].section_name != NULL; i++) {
+		if (!strcmp(default_configsets[i].section_name, section_name)
+		    && !strcmp(default_configsets[i].name, name)) {
+			normalized = zalloc(BUFSIZ);
+			if (!default_configsets[i].type)
+				scnprintf(normalized, BUFSIZ, "%s", value);
+			else if (!strcmp(default_configsets[i].type, TYPE_BOOL))
+				scnprintf(normalized, BUFSIZ, "%s",
+					  perf_config_bool(key, value) ? "true" : "false");
+			else if (!strcmp(default_configsets[i].type, TYPE_ON_OFF))
+				scnprintf(normalized, BUFSIZ, "%s",
+					  perf_config_bool(key, value) ? "on" : "off");
+			else if (!strcmp(default_configsets[i].type, TYPE_INT))
+				scnprintf(normalized, BUFSIZ, "%d",
+					  perf_config_int(key, value));
+			else if (!strcmp(default_configsets[i].type, TYPE_LONG))
+				scnprintf(normalized, BUFSIZ, "%"PRId64,
+					  perf_config_u64(key, value));
+			else if (!strcmp(default_configsets[i].type, TYPE_DIRNAME))
+				scnprintf(normalized, BUFSIZ, "%s",
+					  perf_config_dirname(key, value));
+			return normalized;
+		}
+	}
+
+	normalized = strdup(value);
+	if (!normalized) {
+		pr_err("%s: strdup failed\n", __func__);
+		return NULL;
+	}
+
+	return normalized;
+}
+
+static int set_config(const char *section_name, const char *name, char *value)
+{
+	struct config_section *section_node = NULL;
+	struct config_element *element_node = NULL;
+
+	find_config(&section_node, &element_node, section_name, name);
+	if (value != NULL) {
+		value = normalize_value(section_name, name, value);
+
+		/* if there isn't existent section, add a new section */
+		if (!section_node) {
+			section_node = init_section(section_name);
+			if (!section_node)
+				return -1;
+			list_add_tail(&section_node->list, &sections);
+		}
+		/* if nothing to replace, add a new element which contains key-value pair. */
+		if (!element_node) {
+			add_element(&section_node->element_head, name, value);
+		} else {
+			if (!element_node->value)
+				free(element_node->value);
+			element_node->value = value;
+		}
+	}
+	return perf_configset_write_in_full();
+}
+
+static int collect_current_config(const char *var, const char *value,
+			  void *cb __maybe_unused)
+{
+	struct config_section *section_node;
+	char *key = strdup(var);
+	char *section_name, *name;
+
+	if (!key) {
+		pr_err("%s: strdup failed\n", __func__);
+		return -1;
+	}
+	section_name = strsep(&key, ".");
+	name = strsep(&key, ".");
+
+	section_node = find_section(section_name);
+	if (!section_node) {
+		section_node = init_section(section_name);
+		if (!section_node)
+			return -1;
+		list_add_tail(&section_node->list, &sections);
+	}
+
+	return add_element(&section_node->element_head, name,
+			   normalize_value(section_name, name, value));
+}
+
+static int perf_configset_with_option(configset_fn_t fn, const char *var, char *value)
+{
+	char *section_name;
+	char *name;
+	const char *last_dot;
+	char *key = strdup(var);
+
+	if (!key) {
+		pr_err("%s: strdup failed\n", __func__);
+		return -1;
+	}
+	last_dot = strchr(key, '.');
+	/*
+	 * Since "key" actually contains the section name and the real
+	 * key name separated by a dot, we have to know where the dot is.
+	 */
+	if (last_dot == NULL || last_dot == key) {
+		pr_err("The config variable does not contain a section: %s\n", key);
+		return -1;
+	}
+	if (!last_dot[1]) {
+		pr_err("The config varible does not contain variable name: %s\n", key);
+		return -1;
+	}
+
+	section_name = strsep(&key, ".");
+	name = strsep(&key, ".");
+
+	if (!value) {
+		/* do nothing */
+	} else if (!strcmp(value, "=")) {
+		pr_err("The config variable does not contain a value: %s.%s\n",
+		       section_name, name);
+		return -1;
+	} else {
+		value++;
+		name = strsep(&name, "=");
+	}
+
+	return fn(section_name, name, value);
+
+	pr_err("invalid key: %s\n", var);
+	return -1;
+}
+
 int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 {
-	int ret = 0;
+	int i, ret = 0;
 	int origin_argc = argc - 1;
+	char *value;
 	bool has_option;
 
 	argc = parse_options(argc, argv, config_options, config_usage,
@@ -52,6 +575,9 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 	else
 		has_option = false;
 
+	INIT_LIST_HEAD(&sections);
+	perf_config(collect_current_config, NULL);
+
 	switch (actions) {
 	case ACTION_LIST:
 		if (argc == 0)
@@ -63,6 +589,19 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 		if (!has_option && argc == 0) {
 			ret = perf_config(show_config, NULL);
 			goto out;
+		} else if (argc > 0) {
+			for (i = 0; argv[i]; i++) {
+				value = strchr(argv[i], '=');
+				if (value == NULL)
+					ret = perf_configset_with_option(show_spec_config,
+									 argv[i], value);
+				else
+					ret = perf_configset_with_option(set_config,
+									 argv[i], value);
+				if (ret < 0)
+					break;
+			}
+			goto out;
 		} else
 			goto out_err;
 	}
diff --git a/tools/perf/util/cache.h b/tools/perf/util/cache.h
index c861373..36d7839 100644
--- a/tools/perf/util/cache.h
+++ b/tools/perf/util/cache.h
@@ -1,6 +1,7 @@
 #ifndef __PERF_CACHE_H
 #define __PERF_CACHE_H
 
+#include <linux/list.h>
 #include <stdbool.h>
 #include "util.h"
 #include "strbuf.h"
@@ -19,6 +20,22 @@
 #define PERF_DEBUGFS_ENVIRONMENT "PERF_DEBUGFS_DIR"
 #define PERF_TRACEFS_ENVIRONMENT "PERF_TRACEFS_DIR"
 
+struct config_element {
+	char *name;
+	char *value;
+	struct list_head list;
+};
+
+struct config_section {
+	char *name;
+	struct list_head element_head;
+	struct list_head list;
+};
+
+struct list_head sections;
+
+typedef int (*configset_fn_t)(const char *, const char *, char*);
+extern int perf_configset_write_in_full(void);
 typedef int (*config_fn_t)(const char *, const char *, void *);
 extern int perf_default_config(const char *, const char *, void *);
 extern int perf_config(config_fn_t fn, void *);
diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index e18f653..b6c0d2c 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -21,7 +21,7 @@
 char buildid_dir[MAXPATHLEN]; /* root dir for buildid, binary cache */
 
 static FILE *config_file;
-static const char *config_file_name;
+static char *config_file_name;
 static int config_linenr;
 static int config_file_eof;
 
@@ -420,12 +420,11 @@ static int perf_config_from_file(config_fn_t fn, const char *filename, void *dat
 	ret = -1;
 	if (f) {
 		config_file = f;
-		config_file_name = filename;
+		config_file_name = strdup(filename);
 		config_linenr = 1;
 		config_file_eof = 0;
 		ret = perf_parse_file(fn, data);
 		fclose(f);
-		config_file_name = NULL;
 	}
 	return ret;
 }
@@ -502,6 +501,31 @@ out:
 	return ret;
 }
 
+int perf_configset_write_in_full(void)
+{
+	struct config_section *section_node;
+	struct config_element *element_node;
+	const char *first_line = "# this file is auto-generated.";
+	FILE *fp = fopen(config_file_name, "w");
+
+	if (!fp)
+		return -1;
+
+	fprintf(fp, "%s\n", first_line);
+	/* overwrite configvariables */
+	list_for_each_entry(section_node, &sections, list) {
+		fprintf(fp, "[%s]\n", section_node->name);
+		list_for_each_entry(element_node, &section_node->element_head, list) {
+			if (element_node->value)
+				fprintf(fp, "\t%s = %s\n",
+					element_node->name, element_node->value);
+		}
+	}
+	fclose(fp);
+
+	return 0;
+}
+
 /*
  * Call this to report error for your variable that should not
  * get a boolean value (i.e. "[my] var" means "true").
-- 
1.9.1

[PATCH v2 3/4] perf tools: Add a option 'list-all' to perf-config.

[Taeung Song]

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

    perf config [options]

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

Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
 tools/perf/Documentation/perf-config.txt |  6 ++++
 tools/perf/builtin-config.c              | 48 ++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index f3dae23..e33e481 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -11,6 +11,8 @@ SYNOPSIS
 'perf config' [section.name[=value] ...]
 or
 'perf config' -l | --list
+or
+'perf config' -a | --list-all
 
 DESCRIPTION
 -----------
@@ -23,6 +25,10 @@ OPTIONS
 --list::
 	Show current config variables with key and value into each sections.
 
+-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 175b125..cf7d61d 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -21,10 +21,13 @@ static const char * const config_usage[] = {
 };
 
 #define ACTION_LIST (1<<0)
+#define ACTION_LIST_ALL (1<<1)
 
 static const struct option config_options[] = {
 	OPT_GROUP("Action"),
 	OPT_BIT('l', "list", &actions, "show current config variables", ACTION_LIST),
+	OPT_BIT('a', "list-all", &actions,
+		"show current and all possible config variables with default values", ACTION_LIST_ALL),
 	OPT_END()
 };
 
@@ -516,6 +519,45 @@ static int collect_current_config(const char *var, const char *value,
 			   normalize_value(section_name, name, value));
 }
 
+static int show_all_config(void)
+{
+	int i;
+	bool has_config;
+	struct config_section *section_node;
+	struct config_element *element_node;
+
+	for (i = 0; default_configsets[i].section_name != NULL; i++) {
+		find_config(&section_node, &element_node,
+			    default_configsets[i].section_name, default_configsets[i].name);
+
+		if (!element_node)
+			printf("%s.%s=%s\n", default_configsets[i].section_name,
+			       default_configsets[i].name, default_configsets[i].value);
+		else
+			printf("%s.%s=%s\n", section_node->name,
+			       element_node->name, element_node->value);
+	}
+
+	/* Print config variables the default configsets haven't */
+	list_for_each_entry(section_node, &sections, list) {
+		list_for_each_entry(element_node, &section_node->element_head, list) {
+			has_config = false;
+			for (i = 0; default_configsets[i].section_name != NULL; i++) {
+				if (!strcmp(default_configsets[i].section_name, section_node->name)
+				    && !strcmp(default_configsets[i].name, element_node->name)) {
+					has_config = true;
+					break;
+				}
+			}
+			if (!has_config)
+				printf("%s.%s=%s\n", section_node->name,
+				       element_node->name, element_node->value);
+		}
+	}
+
+	return 0;
+}
+
 static int perf_configset_with_option(configset_fn_t fn, const char *var, char *value)
 {
 	char *section_name;
@@ -585,6 +627,12 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 		else
 			goto out_err;
 		goto out;
+	case ACTION_LIST_ALL:
+		if (argc == 0)
+			ret = show_all_config();
+		else
+			goto out_err;
+		goto out;
 	default:
 		if (!has_option && argc == 0) {
 			ret = perf_config(show_config, NULL);
-- 
1.9.1

[PATCH v2 4/4] perf tools: Add a option 'remove' to perf-config.

[Taeung Song]

A option 'remove' is to remove specific config variables.
For the syntax examples,

    # perf config -r | --remove [section.name ...]

Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
 tools/perf/Documentation/perf-config.txt |  6 ++++++
 tools/perf/builtin-config.c              | 25 ++++++++++++++++++++++++-
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index e33e481..a543e1b 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -13,6 +13,8 @@ or
 'perf config' -l | --list
 or
 'perf config' -a | --list-all
+or
+'perf config' -r | --remove [section.name ...]
 
 DESCRIPTION
 -----------
@@ -29,6 +31,10 @@ OPTIONS
 --list-all::
 	Show current and all possible config variables with default values.
 
+-r::
+--remove::
+	Remove specific config variables.
+
 CONFIGURATION FILE
 ------------------
 
diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index cf7d61d..b7afe6e 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -22,12 +22,14 @@ static const char * const config_usage[] = {
 
 #define ACTION_LIST (1<<0)
 #define ACTION_LIST_ALL (1<<1)
+#define ACTION_REMOVE (1<<2)
 
 static const struct option config_options[] = {
 	OPT_GROUP("Action"),
 	OPT_BIT('l', "list", &actions, "show current config variables", ACTION_LIST),
 	OPT_BIT('a', "list-all", &actions,
 		"show current and all possible config variables with default values", ACTION_LIST_ALL),
+	OPT_BIT('r', "remove", &actions, "remove specific variables: [section.name ...]", ACTION_REMOVE),
 	OPT_END()
 };
 
@@ -471,7 +473,15 @@ static int set_config(const char *section_name, const char *name, char *value)
 	struct config_element *element_node = NULL;
 
 	find_config(&section_node, &element_node, section_name, name);
-	if (value != NULL) {
+	if (!value) {
+		/* value == NULL means remove the variable */
+		if (section_node && element_node) {
+			if (!element_node->value)
+				free(element_node->value);
+			element_node->value = NULL;
+		} else
+			pr_err("Error: Failed to find the variable.\n");
+	} else {
 		value = normalize_value(section_name, name, value);
 
 		/* if there isn't existent section, add a new section */
@@ -490,6 +500,7 @@ static int set_config(const char *section_name, const char *name, char *value)
 			element_node->value = value;
 		}
 	}
+
 	return perf_configset_write_in_full();
 }
 
@@ -633,6 +644,18 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 		else
 			goto out_err;
 		goto out;
+	case ACTION_REMOVE:
+		for (i = 0; argv[i]; i++) {
+			if (value == NULL)
+				ret = perf_configset_with_option(set_config, argv[i], NULL);
+			else {
+				pr_err("invalid key: %s\n", argv[i]);
+				return -1;
+			}
+			if (ret < 0)
+				goto out;
+		}
+		goto out;
 	default:
 		if (!has_option && argc == 0) {
 			ret = perf_config(show_config, NULL);
-- 
1.9.1