521 lines
17 KiB
Plaintext
521 lines
17 KiB
Plaintext
perf-config(1)
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==============
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NAME
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----
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perf-config - Get and set variables in a configuration file.
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SYNOPSIS
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--------
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[verse]
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'perf config' [<file-option>] [section.name[=value] ...]
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or
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'perf config' [<file-option>] -l | --list
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DESCRIPTION
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-----------
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You can manage variables in a configuration file with this command.
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OPTIONS
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-------
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-l::
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--list::
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Show current config variables, name and value, for all sections.
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--user::
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For writing and reading options: write to user
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'$HOME/.perfconfig' file or read it.
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--system::
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For writing and reading options: write to system-wide
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'$(sysconfdir)/perfconfig' or read it.
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CONFIGURATION FILE
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------------------
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The perf configuration file contains many variables to change various
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aspects of each of its tools, including output, disk usage, etc.
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The '$HOME/.perfconfig' file is used to store a per-user configuration.
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The file '$(sysconfdir)/perfconfig' can be used to
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store a system-wide default configuration.
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When reading or writing, the values are read from the system and user
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configuration files by default, and options '--system' and '--user'
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can be used to tell the command to read from or write to only that location.
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Syntax
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~~~~~~
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The file consist of sections. A section starts with its name
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surrounded by square brackets and continues till the next section
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begins. Each variable must be in a section, and have the form
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'name = value', for example:
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[section]
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name1 = value1
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name2 = value2
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Section names are case sensitive and can contain any characters except
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newline (double quote `"` and backslash have to be escaped as `\"` and `\\`,
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respectively). Section headers can't span multiple lines.
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Example
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~~~~~~~
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Given a $HOME/.perfconfig like this:
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#
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# This is the config file, and
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# a '#' and ';' character indicates a comment
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#
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[colors]
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# Color variables
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top = red, default
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medium = green, default
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normal = lightgray, default
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selected = white, lightgray
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jump_arrows = blue, default
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addr = magenta, default
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root = white, blue
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[tui]
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# Defaults if linked with libslang
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report = on
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annotate = on
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top = on
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[buildid]
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# Default, disable using /dev/null
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dir = ~/.debug
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[annotate]
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# Defaults
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hide_src_code = false
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use_offset = true
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jump_arrows = true
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show_nr_jumps = false
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[help]
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# Format can be man, info, web or html
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format = man
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autocorrect = 0
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[ui]
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show-headers = true
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[call-graph]
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# fp (framepointer), dwarf
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record-mode = fp
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print-type = graph
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order = caller
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sort-key = function
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[report]
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# Defaults
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sort_order = comm,dso,symbol
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percent-limit = 0
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queue-size = 0
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children = true
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group = true
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You can hide source code of annotate feature setting the config to false with
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% perf config annotate.hide_src_code=true
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If you want to add or modify several config items, you can do like
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% perf config ui.show-headers=false kmem.default=slab
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To modify the sort order of report functionality in user config file(i.e. `~/.perfconfig`), do
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% perf config --user report sort-order=srcline
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To change colors of selected line to other foreground and background colors
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in system config file (i.e. `$(sysconf)/perfconfig`), do
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% perf config --system colors.selected=yellow,green
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To query the record mode of call graph, do
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% perf config call-graph.record-mode
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If you want to know multiple config key/value pairs, you can do like
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% perf config report.queue-size call-graph.order report.children
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To query the config value of sort order of call graph in user config file (i.e. `~/.perfconfig`), do
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% perf config --user call-graph.sort-order
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To query the config value of buildid directory in system config file (i.e. `$(sysconf)/perfconfig`), do
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% perf config --system buildid.dir
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Variables
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~~~~~~~~~
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colors.*::
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The variables for customizing the colors used in the output for the
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'report', 'top' and 'annotate' in the TUI. They should specify the
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foreground and background colors, separated by a comma, for example:
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medium = green, lightgray
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If you want to use the color configured for you terminal, just leave it
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as 'default', for example:
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medium = default, lightgray
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Available colors:
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red, yellow, green, cyan, gray, black, blue,
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white, default, magenta, lightgray
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colors.top::
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'top' means a overhead percentage which is more than 5%.
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And values of this variable specify percentage colors.
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Basic key values are foreground-color 'red' and
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background-color 'default'.
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colors.medium::
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'medium' means a overhead percentage which has more than 0.5%.
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Default values are 'green' and 'default'.
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colors.normal::
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'normal' means the rest of overhead percentages
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except 'top', 'medium', 'selected'.
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Default values are 'lightgray' and 'default'.
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colors.selected::
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This selects the colors for the current entry in a list of entries
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from sub-commands (top, report, annotate).
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Default values are 'black' and 'lightgray'.
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colors.jump_arrows::
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Colors for jump arrows on assembly code listings
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such as 'jns', 'jmp', 'jane', etc.
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Default values are 'blue', 'default'.
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colors.addr::
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This selects colors for addresses from 'annotate'.
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Default values are 'magenta', 'default'.
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colors.root::
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Colors for headers in the output of a sub-commands (top, report).
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Default values are 'white', 'blue'.
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tui.*, gtk.*::
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Subcommands that can be configured here are 'top', 'report' and 'annotate'.
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These values are booleans, for example:
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[tui]
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top = true
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will make the TUI be the default for the 'top' subcommand. Those will be
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available if the required libs were detected at tool build time.
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buildid.*::
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buildid.dir::
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Each executable and shared library in modern distributions comes with a
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content based identifier that, if available, will be inserted in a
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'perf.data' file header to, at analysis time find what is needed to do
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symbol resolution, code annotation, etc.
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The recording tools also stores a hard link or copy in a per-user
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directory, $HOME/.debug/, of binaries, shared libraries, /proc/kallsyms
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and /proc/kcore files to be used at analysis time.
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The buildid.dir variable can be used to either change this directory
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cache location, or to disable it altogether. If you want to disable it,
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set buildid.dir to /dev/null. The default is $HOME/.debug
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annotate.*::
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These options work only for TUI.
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These are in control of addresses, jump function, source code
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in lines of assembly code from a specific program.
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annotate.hide_src_code::
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If a program which is analyzed has source code,
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this option lets 'annotate' print a list of assembly code with the source code.
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For example, let's see a part of a program. There're four lines.
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If this option is 'true', they can be printed
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without source code from a program as below.
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│ push %rbp
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│ mov %rsp,%rbp
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│ sub $0x10,%rsp
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│ mov (%rdi),%rdx
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But if this option is 'false', source code of the part
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can be also printed as below. Default is 'false'.
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│ struct rb_node *rb_next(const struct rb_node *node)
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│ {
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│ push %rbp
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│ mov %rsp,%rbp
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│ sub $0x10,%rsp
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│ struct rb_node *parent;
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│
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│ if (RB_EMPTY_NODE(node))
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│ mov (%rdi),%rdx
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│ return n;
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annotate.use_offset::
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Basing on a first address of a loaded function, offset can be used.
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Instead of using original addresses of assembly code,
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addresses subtracted from a base address can be printed.
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Let's illustrate an example.
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If a base address is 0XFFFFFFFF81624d50 as below,
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ffffffff81624d50 <load0>
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an address on assembly code has a specific absolute address as below
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ffffffff816250b8:│ mov 0x8(%r14),%rdi
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but if use_offset is 'true', an address subtracted from a base address is printed.
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Default is true. This option is only applied to TUI.
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368:│ mov 0x8(%r14),%rdi
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annotate.jump_arrows::
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There can be jump instruction among assembly code.
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Depending on a boolean value of jump_arrows,
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arrows can be printed or not which represent
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where do the instruction jump into as below.
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│ ┌──jmp 1333
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│ │ xchg %ax,%ax
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│1330:│ mov %r15,%r10
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│1333:└─→cmp %r15,%r14
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If jump_arrow is 'false', the arrows isn't printed as below.
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Default is 'false'.
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│ ↓ jmp 1333
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│ xchg %ax,%ax
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│1330: mov %r15,%r10
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│1333: cmp %r15,%r14
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annotate.show_linenr::
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When showing source code if this option is 'true',
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line numbers are printed as below.
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│1628 if (type & PERF_SAMPLE_IDENTIFIER) {
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│ ↓ jne 508
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│1628 data->id = *array;
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│1629 array++;
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│1630 }
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However if this option is 'false', they aren't printed as below.
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Default is 'false'.
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│ if (type & PERF_SAMPLE_IDENTIFIER) {
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│ ↓ jne 508
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│ data->id = *array;
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│ array++;
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│ }
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annotate.show_nr_jumps::
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Let's see a part of assembly code.
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│1382: movb $0x1,-0x270(%rbp)
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If use this, the number of branches jumping to that address can be printed as below.
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Default is 'false'.
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│1 1382: movb $0x1,-0x270(%rbp)
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annotate.show_total_period::
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To compare two records on an instruction base, with this option
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provided, display total number of samples that belong to a line
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in assembly code. If this option is 'true', total periods are printed
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instead of percent values as below.
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302 │ mov %eax,%eax
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But if this option is 'false', percent values for overhead are printed i.e.
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Default is 'false'.
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99.93 │ mov %eax,%eax
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annotate.offset_level::
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Default is '1', meaning just jump targets will have offsets show right beside
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the instruction. When set to '2' 'call' instructions will also have its offsets
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shown, 3 or higher will show offsets for all instructions.
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hist.*::
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hist.percentage::
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This option control the way to calculate overhead of filtered entries -
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that means the value of this option is effective only if there's a
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filter (by comm, dso or symbol name). Suppose a following example:
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Overhead Symbols
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........ .......
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33.33% foo
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33.33% bar
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33.33% baz
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This is an original overhead and we'll filter out the first 'foo'
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entry. The value of 'relative' would increase the overhead of 'bar'
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and 'baz' to 50.00% for each, while 'absolute' would show their
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current overhead (33.33%).
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ui.*::
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ui.show-headers::
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This option controls display of column headers (like 'Overhead' and 'Symbol')
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in 'report' and 'top'. If this option is false, they are hidden.
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This option is only applied to TUI.
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call-graph.*::
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When sub-commands 'top' and 'report' work with -g/—-children
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there're options in control of call-graph.
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call-graph.record-mode::
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The record-mode can be 'fp' (frame pointer), 'dwarf' and 'lbr'.
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The value of 'dwarf' is effective only if perf detect needed library
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(libunwind or a recent version of libdw).
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'lbr' only work for cpus that support it.
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call-graph.dump-size::
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The size of stack to dump in order to do post-unwinding. Default is 8192 (byte).
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When using dwarf into record-mode, the default size will be used if omitted.
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call-graph.print-type::
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The print-types can be graph (graph absolute), fractal (graph relative),
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flat and folded. This option controls a way to show overhead for each callchain
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entry. Suppose a following example.
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Overhead Symbols
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........ .......
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40.00% foo
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---foo
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|--50.00%--bar
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| main
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--50.00%--baz
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main
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This output is a 'fractal' format. The 'foo' came from 'bar' and 'baz' exactly
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half and half so 'fractal' shows 50.00% for each
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(meaning that it assumes 100% total overhead of 'foo').
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The 'graph' uses absolute overhead value of 'foo' as total so each of
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'bar' and 'baz' callchain will have 20.00% of overhead.
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If 'flat' is used, single column and linear exposure of call chains.
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'folded' mean call chains are displayed in a line, separated by semicolons.
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call-graph.order::
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This option controls print order of callchains. The default is
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'callee' which means callee is printed at top and then followed by its
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caller and so on. The 'caller' prints it in reverse order.
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If this option is not set and report.children or top.children is
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set to true (or the equivalent command line option is given),
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the default value of this option is changed to 'caller' for the
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execution of 'perf report' or 'perf top'. Other commands will
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still default to 'callee'.
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call-graph.sort-key::
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The callchains are merged if they contain same information.
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The sort-key option determines a way to compare the callchains.
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A value of 'sort-key' can be 'function' or 'address'.
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The default is 'function'.
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call-graph.threshold::
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When there're many callchains it'd print tons of lines. So perf omits
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small callchains under a certain overhead (threshold) and this option
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control the threshold. Default is 0.5 (%). The overhead is calculated
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by value depends on call-graph.print-type.
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call-graph.print-limit::
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This is a maximum number of lines of callchain printed for a single
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histogram entry. Default is 0 which means no limitation.
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report.*::
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report.sort_order::
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Allows changing the default sort order from "comm,dso,symbol" to
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some other default, for instance "sym,dso" may be more fitting for
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kernel developers.
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report.percent-limit::
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This one is mostly the same as call-graph.threshold but works for
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histogram entries. Entries having an overhead lower than this
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percentage will not be printed. Default is '0'. If percent-limit
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is '10', only entries which have more than 10% of overhead will be
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printed.
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report.queue-size::
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This option sets up the maximum allocation size of the internal
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event queue for ordering events. Default is 0, meaning no limit.
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report.children::
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'Children' means functions called from another function.
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If this option is true, 'perf report' cumulates callchains of children
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and show (accumulated) total overhead as well as 'Self' overhead.
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Please refer to the 'perf report' manual. The default is 'true'.
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report.group::
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This option is to show event group information together.
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Example output with this turned on, notice that there is one column
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per event in the group, ref-cycles and cycles:
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# group: {ref-cycles,cycles}
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# ========
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#
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# Samples: 7K of event 'anon group { ref-cycles, cycles }'
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# Event count (approx.): 6876107743
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#
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# Overhead Command Shared Object Symbol
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# ................ ....... ................. ...................
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#
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99.84% 99.76% noploop noploop [.] main
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0.07% 0.00% noploop ld-2.15.so [.] strcmp
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0.03% 0.00% noploop [kernel.kallsyms] [k] timerqueue_del
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top.*::
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top.children::
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Same as 'report.children'. So if it is enabled, the output of 'top'
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command will have 'Children' overhead column as well as 'Self' overhead
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column by default.
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The default is 'true'.
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man.*::
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man.viewer::
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This option can assign a tool to view manual pages when 'help'
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subcommand was invoked. Supported tools are 'man', 'woman'
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(with emacs client) and 'konqueror'. Default is 'man'.
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New man viewer tool can be also added using 'man.<tool>.cmd'
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or use different path using 'man.<tool>.path' config option.
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pager.*::
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pager.<subcommand>::
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When the subcommand is run on stdio, determine whether it uses
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pager or not based on this value. Default is 'unspecified'.
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kmem.*::
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kmem.default::
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This option decides which allocator is to be analyzed if neither
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'--slab' nor '--page' option is used. Default is 'slab'.
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record.*::
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record.build-id::
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This option can be 'cache', 'no-cache' or 'skip'.
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'cache' is to post-process data and save/update the binaries into
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the build-id cache (in ~/.debug). This is the default.
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But if this option is 'no-cache', it will not update the build-id cache.
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'skip' skips post-processing and does not update the cache.
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diff.*::
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diff.order::
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This option sets the number of columns to sort the result.
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The default is 0, which means sorting by baseline.
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Setting it to 1 will sort the result by delta (or other
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compute method selected).
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diff.compute::
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This options sets the method for computing the diff result.
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Possible values are 'delta', 'delta-abs', 'ratio' and
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'wdiff'. Default is 'delta'.
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SEE ALSO
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--------
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linkperf:perf[1]
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