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SubjectRe: [PATCH 1/2] perf tools: Add 'perf-config' command
Em Thu, Apr 09, 2015 at 11:26:30PM +0900, Taeung Song escreveu:
> The perf configuration file contain 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 '--all' option and a document for it.

Thanks for doing this! Now we need to read it thru, but having more
documentation like this is really nice!

- Arnaldo

> Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
> ---
> tools/perf/Build | 1 +
> tools/perf/Documentation/perf-config.txt | 433 ++++++++++++++++++++++++++++
> tools/perf/Documentation/perfconfig.example | 65 ++++-
> tools/perf/builtin-config.c | 68 +++++
> tools/perf/builtin.h | 1 +
> tools/perf/command-list.txt | 1 +
> tools/perf/perf.c | 1 +
> 7 files changed, 559 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..b251702
> --- /dev/null
> +++ b/tools/perf/Documentation/perf-config.txt
> @@ -0,0 +1,433 @@
> +perf-config(1)
> +==============
> +
> +NAME
> +----
> +perf-config - Get and set variables in configuration file.
> +
> +SYNOPSIS
> +--------
> +[verse]
> +'perf config' -a | --all
> +
> +DESCRIPTION
> +-----------
> +You can manage variables in configuration file with this command.
> +
> +OPTIONS
> +-------
> +
> +-a::
> +--all::
> + Show all 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::
> +
> +pager.*::
> + pager.report::
> + pager
> +
> +SEE ALSO
> +--------
> +linkperf:perf[1]
> diff --git a/tools/perf/Documentation/perfconfig.example b/tools/perf/Documentation/perfconfig.example
> index 767ea24..853aa20 100644
> --- a/tools/perf/Documentation/perfconfig.example
> +++ b/tools/perf/Documentation/perfconfig.example
> @@ -1,29 +1,72 @@
> [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
> diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
> new file mode 100644
> index 0000000..32f8ae6
> --- /dev/null
> +++ b/tools/perf/builtin-config.c
> @@ -0,0 +1,68 @@
> +/*
> + * 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 all_action;
> +} params;
> +
> +static const char * const config_usage[] = {
> + "perf config [options]",
> + NULL
> +};
> +static const struct option config_options[] = {
> + OPT_GROUP("Action"),
> + OPT_BOOLEAN('a', "all", &params.all_action, "print all configurations"),
> + OPT_END()
> +};
> +
> +static void check_argc(int argc, int limit)
> +{
> + if (argc >= limit && argc <= limit)
> + return;
> + error("wrong number of arguments");
> + usage_with_options(config_usage, config_options);
> +}
> +
> +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 (argc > 0) {
> + if (strcmp(argv[0], "-") == 0) {
> + pr_warning(" Error: '-' is not supported.\n");
> + usage_with_options(config_usage, config_options);
> + }
> + }
> +
> + if (argc == 0 || params.all_action) {
> + check_argc(argc, 0);
> + ret = perf_config(show_config, NULL);
> + }
> +
> + 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


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