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

Taeung Song
2015-04-27T06:34:53Z

The perf configuration file contains many variables which can make
the perf command's action more effective and more skilful.
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.

Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
tools/perf/Build | 1 +
tools/perf/Documentation/perf-config.txt | 436 ++++++++++++++++++++++++++++
tools/perf/Documentation/perfconfig.example | 68 ++++-
tools/perf/builtin-config.c | 56 ++++
tools/perf/builtin.h | 1 +
tools/perf/command-list.txt | 1 +
tools/perf/perf.c | 1 +
7 files changed, 553 insertions(+), 11 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..489c2c6
--- /dev/null
+++ b/tools/perf/Documentation/perf-config.txt
@@ -0,0 +1,436 @@
+perf-config(1)
+==============
+
+NAME
+----
+perf-config - Get and set variables in configuration file.
+
+SYNOPSIS
+--------
+[verse]
+'perf config' -l | --list
+
+DESCRIPTION
+-----------
+You can manage variables in 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 contain many variables which can make
+the perf command's action more effective, more skilful.
+The '$HOME/.perfconfig' file is used to store a per-user configuration.
+The file 'etc/perfconfig' or '$(sysconfdir)/perfconfig' can be used to
+store a system-wide default configuration.
+
+The variables are divided into sections. In each sections, the variables
+can contain a key and values.
+
+Syntax
+~~~~~~
+
+The file consists of sections and subkeys. 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 'subkey = value'.
+
+ [section]
+ subkey1 = value1
+ subkey2 = value2
+
+Subsection names are case sensitive and can contain any characters except
+newline (doublequote `"` and backslash have to be escaped as `\"` and `\\`,
+respectively). Section headers cannot span multiple
+lines. Variables may belong directly to a section or to a given subsection.
+
+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 = /root/.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 appoint colors of the output which is printed out
+ from ‘report’, ‘top’,’annotate’ on tui.
+ Color variables is composed of foreground and background
+ and should have two values for them. If you want to set as colors
+ of your terminal, you should use ‘default’ for color value.
+ The kind of color which can be used as below.
+ red, green, default, black, blue, white, magenta, lightgray
+
+ colors.top::
+ ‘top’ means a overhead percentage which has more than 5%.
+ And values of it’s 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 rest of overhead percentages
+ except ‘top’, ‘medium’, ‘selected’.
+ Default values are ’lightgray’ and ’default’.
+ colors.selected::
+ This appoint colors for forcussed one of the output list
+ from sub-commands (top,report,annotate).
+ Default values are ’white’ and ’lightgray’.
+ colors.code::
+ Colors for a arrow and lines on jumping by assembly code
+ such as ‘jns’,’jmp’,’jane’,etc. Default values are ‘blue’, ‘default’.
+ colors.addr::
+ This appoint colors for addresses from a sub-command ’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 a needed 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 a
+ needed 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.
+ For example, there’re three functions like below.
+
+ void foo(void) {
+ /* do something */
+ }
+
+ void bar(void) {
+ /* do something */
+ foo();
+ }
+
+ int main(void) {
+ bar()
+ return 0;
+ }
+
+ Defaultly the output of sub-commands such as ’top’, ‘report’ and ‘annotate’
+ depend on a sort of overhead into each functions as below.
+
+ Overhead Symbol
+ ........ .....................
+ 60.00% foo
+ |
+ --- foo
+ bar
+ main
+ __libc_start_main
+
+ 40.00% bar
+ |
+ --- bar
+ main
+ __libc_start_main
+
+ But if this option is true, the sort is changed into a sort of
+ overhead into each children group of each function reciting all functions
+ from a first parent function till a last child function like below.
+ And it requires -g/--call-graph option enabled
+
+ Children Self Symbol
+ ........ ........ ....................
+ 100.00% 0.00% __libc_start_main
+ |
+ --- __libc_start_main
+
+ 100.00% 0.00% main
+ |
+ --- main
+ __libc_start_main
+
+ 100.00% 40.00% bar
+ |
+ --- bar
+ main
+ __libc_start_main
+
+ 60.00% 60.00% foo
+ |
+ --- foo
+ bar
+ main
+ __libc_start_main
+
+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]
diff --git a/tools/perf/Documentation/perfconfig.example b/tools/perf/Documentation/perfconfig.example
index 767ea24..5d093a9 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

[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..9e4ba72
--- /dev/null
+++ b/tools/perf/builtin-config.c
@@ -0,0 +1,56 @@
+/*
+ * 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 struct {
+ bool list_action;
+} params;
+
+static const char * const config_usage[] = {
+ "perf config [options]",
+ NULL
+};
+static const struct option config_options[] = {
+ OPT_GROUP("Action"),
+ OPT_BOOLEAN('l', "list", &params.list_action, "show current config variables"),
+ 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;
+
+ argc = parse_options(argc, argv, config_options, config_usage,
+ PARSE_OPT_STOP_AT_NON_OPTION);
+
+ if (params.list_action && argc == 0)
+ ret = perf_config(show_config, NULL);
+ else {
+ pr_warning("Error: Unknown argument.\n");
+ usage_with_options(config_usage, config_options);
+ }
+
+ 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