43c4023152
The default is 1 (jump_target):
# perf annotate --ignore-vmlinux --stdio2 _raw_spin_lock_irqsave
Samples: 3K of event 'cycles:ppp', 3000 Hz, Event count (approx.): 2766398574
_raw_spin_lock_irqsave() /proc/kcore
0.26 nop
4.61 push %rbx
19.33 pushfq
7.97 pop %rax
0.32 nop
0.06 mov %rax,%rbx
14.63 cli
0.06 nop
xor %eax,%eax
mov $0x1,%edx
49.94 lock cmpxchg %edx,(%rdi)
0.16 test %eax,%eax
↓ jne 2b
2.66 mov %rbx,%rax
pop %rbx
← retq
2b: mov %eax,%esi
→ callq *ffffffffb30eaed0
mov %rbx,%rax
pop %rbx
← retq
#
But one can ask for showing offsets for call instructions by setting
this:
# perf annotate --ignore-vmlinux --stdio2 _raw_spin_lock_irqsave
Samples: 3K of event 'cycles:ppp', 3000 Hz, Event count (approx.): 2766398574
_raw_spin_lock_irqsave() /proc/kcore
0.26 nop
4.61 push %rbx
19.33 pushfq
7.97 pop %rax
0.32 nop
0.06 mov %rax,%rbx
14.63 cli
0.06 nop
xor %eax,%eax
mov $0x1,%edx
49.94 lock cmpxchg %edx,(%rdi)
0.16 test %eax,%eax
↓ jne 2b
2.66 mov %rbx,%rax
pop %rbx
← retq
2b: mov %eax,%esi
2d: → callq *ffffffffb30eaed0
mov %rbx,%rax
pop %rbx
← retq
#
Or using a big value to ask for all offsets to be shown:
# cat ~/.perfconfig
[annotate]
offset_level = 100
hide_src_code = true
# perf annotate --ignore-vmlinux --stdio2 _raw_spin_lock_irqsave
Samples: 3K of event 'cycles:ppp', 3000 Hz, Event count (approx.): 2766398574
_raw_spin_lock_irqsave() /proc/kcore
0.26 0: nop
4.61 5: push %rbx
19.33 6: pushfq
7.97 7: pop %rax
0.32 8: nop
0.06 d: mov %rax,%rbx
14.63 10: cli
0.06 11: nop
17: xor %eax,%eax
19: mov $0x1,%edx
49.94 1e: lock cmpxchg %edx,(%rdi)
0.16 22: test %eax,%eax
24: ↓ jne 2b
2.66 26: mov %rbx,%rax
29: pop %rbx
2a: ← retq
2b: mov %eax,%esi
2d: → callq *ffffffffb30eaed0
32: mov %rbx,%rax
35: pop %rbx
36: ← retq
#
This also affects the TUI, i.e. the default 'perf annotate' and 'perf
top/report' -> A hotkey -> annotate interfaces, when slang-devel is present
in the build, i.e.:
# perf version --build-options | grep slang
libslang: [ on ] # HAVE_SLANG_SUPPORT
#
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Martin Liška <mliska@suse.cz>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Cc: Thomas Richter <tmricht@linux.vnet.ibm.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-venm6x5zrt40eu8hxdsmqxz6@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
520 lines
17 KiB
Text
520 lines
17 KiB
Text
perf-config(1)
|
|
==============
|
|
|
|
NAME
|
|
----
|
|
perf-config - Get and set variables in a configuration file.
|
|
|
|
SYNOPSIS
|
|
--------
|
|
[verse]
|
|
'perf config' [<file-option>] [section.name[=value] ...]
|
|
or
|
|
'perf config' [<file-option>] -l | --list
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
You can manage variables in a configuration file with this command.
|
|
|
|
OPTIONS
|
|
-------
|
|
|
|
-l::
|
|
--list::
|
|
Show current config variables, name and value, for all sections.
|
|
|
|
--user::
|
|
For writing and reading options: write to user
|
|
'$HOME/.perfconfig' file or read it.
|
|
|
|
--system::
|
|
For writing and reading options: write to system-wide
|
|
'$(sysconfdir)/perfconfig' or read it.
|
|
|
|
CONFIGURATION FILE
|
|
------------------
|
|
|
|
The perf configuration file contains many variables to change various
|
|
aspects of each of its tools, including output, disk usage, etc.
|
|
The '$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.
|
|
|
|
When reading or writing, the values are read from the system and user
|
|
configuration files by default, and options '--system' and '--user'
|
|
can be used to tell the command to read from or write to only that location.
|
|
|
|
Syntax
|
|
~~~~~~
|
|
|
|
The file consist of sections. A section starts with its name
|
|
surrounded by square brackets and continues till the next section
|
|
begins. Each variable must be in a section, and have the form
|
|
'name = value', for example:
|
|
|
|
[section]
|
|
name1 = value1
|
|
name2 = value2
|
|
|
|
Section names are case sensitive and can contain any characters except
|
|
newline (double quote `"` and backslash have to be escaped as `\"` and `\\`,
|
|
respectively). Section headers can't span multiple lines.
|
|
|
|
Example
|
|
~~~~~~~
|
|
|
|
Given a $HOME/.perfconfig like this:
|
|
|
|
#
|
|
# This is the config file, and
|
|
# a '#' and ';' character indicates a comment
|
|
#
|
|
|
|
[colors]
|
|
# Color variables
|
|
top = red, default
|
|
medium = green, default
|
|
normal = lightgray, default
|
|
selected = white, lightgray
|
|
jump_arrows = blue, default
|
|
addr = magenta, default
|
|
root = white, blue
|
|
|
|
[tui]
|
|
# Defaults if linked with libslang
|
|
report = on
|
|
annotate = on
|
|
top = on
|
|
|
|
[buildid]
|
|
# Default, disable using /dev/null
|
|
dir = ~/.debug
|
|
|
|
[annotate]
|
|
# Defaults
|
|
hide_src_code = false
|
|
use_offset = true
|
|
jump_arrows = true
|
|
show_nr_jumps = false
|
|
|
|
[help]
|
|
# Format can be man, info, web or html
|
|
format = man
|
|
autocorrect = 0
|
|
|
|
[ui]
|
|
show-headers = true
|
|
|
|
[call-graph]
|
|
# fp (framepointer), dwarf
|
|
record-mode = fp
|
|
print-type = graph
|
|
order = caller
|
|
sort-key = function
|
|
|
|
[report]
|
|
# Defaults
|
|
sort-order = comm,dso,symbol
|
|
percent-limit = 0
|
|
queue-size = 0
|
|
children = true
|
|
group = true
|
|
|
|
You can hide source code of annotate feature setting the config to false with
|
|
|
|
% perf config annotate.hide_src_code=true
|
|
|
|
If you want to add or modify several config items, you can do like
|
|
|
|
% perf config ui.show-headers=false kmem.default=slab
|
|
|
|
To modify the sort order of report functionality in user config file(i.e. `~/.perfconfig`), do
|
|
|
|
% perf config --user report sort-order=srcline
|
|
|
|
To change colors of selected line to other foreground and background colors
|
|
in system config file (i.e. `$(sysconf)/perfconfig`), do
|
|
|
|
% perf config --system colors.selected=yellow,green
|
|
|
|
To query the record mode of call graph, do
|
|
|
|
% perf config call-graph.record-mode
|
|
|
|
If you want to know multiple config key/value pairs, you can do like
|
|
|
|
% perf config report.queue-size call-graph.order report.children
|
|
|
|
To query the config value of sort order of call graph in user config file (i.e. `~/.perfconfig`), do
|
|
|
|
% perf config --user call-graph.sort-order
|
|
|
|
To query the config value of buildid directory in system config file (i.e. `$(sysconf)/perfconfig`), do
|
|
|
|
% perf config --system buildid.dir
|
|
|
|
Variables
|
|
~~~~~~~~~
|
|
|
|
colors.*::
|
|
The variables for customizing the colors used in the output for the
|
|
'report', 'top' and 'annotate' in the TUI. They should specify the
|
|
foreground and background colors, separated by a comma, for example:
|
|
|
|
medium = green, lightgray
|
|
|
|
If you want to use the color configured for you terminal, just leave it
|
|
as 'default', for example:
|
|
|
|
medium = default, lightgray
|
|
|
|
Available colors:
|
|
red, yellow, green, cyan, gray, black, blue,
|
|
white, default, magenta, lightgray
|
|
|
|
colors.top::
|
|
'top' means a overhead percentage which is more than 5%.
|
|
And values of this variable specify percentage colors.
|
|
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 'black' and 'lightgray'.
|
|
colors.jump_arrows::
|
|
Colors for jump arrows 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-commands (top, report).
|
|
Default values are 'white', 'blue'.
|
|
|
|
tui.*, gtk.*::
|
|
Subcommands that can be configured here are 'top', 'report' and 'annotate'.
|
|
These values are booleans, for example:
|
|
|
|
[tui]
|
|
top = true
|
|
|
|
will make the TUI be the default for the 'top' subcommand. Those will be
|
|
available if the required libs were detected at tool build time.
|
|
|
|
buildid.*::
|
|
buildid.dir::
|
|
Each executable and shared library in modern distributions comes with a
|
|
content based identifier that, if available, will be inserted in a
|
|
'perf.data' file header to, at analysis time find what is needed to do
|
|
symbol resolution, code annotation, etc.
|
|
|
|
The recording tools also stores a hard link or copy in a per-user
|
|
directory, $HOME/.debug/, of binaries, shared libraries, /proc/kallsyms
|
|
and /proc/kcore files to be used at analysis time.
|
|
|
|
The buildid.dir variable can be used to either change this directory
|
|
cache location, or to disable it altogether. If you want to disable it,
|
|
set buildid.dir to /dev/null. The default is $HOME/.debug
|
|
|
|
annotate.*::
|
|
These options work only for TUI.
|
|
These are 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,
|
|
this option lets '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 'true', 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 'false', source code of the part
|
|
can be also printed as below. Default is 'false'.
|
|
|
|
│ 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 an example.
|
|
If a base address is 0XFFFFFFFF81624d50 as below,
|
|
|
|
ffffffff81624d50 <load0>
|
|
|
|
an address on assembly code has a specific absolute address as below
|
|
|
|
ffffffff816250b8:│ mov 0x8(%r14),%rdi
|
|
|
|
but if use_offset is 'true', an address subtracted from a base address is printed.
|
|
Default is true. This option is only applied to TUI.
|
|
|
|
368:│ mov 0x8(%r14),%rdi
|
|
|
|
annotate.jump_arrows::
|
|
There can be 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.
|
|
Default is 'false'.
|
|
|
|
│ ↓ jmp 1333
|
|
│ xchg %ax,%ax
|
|
│1330: mov %r15,%r10
|
|
│1333: cmp %r15,%r14
|
|
|
|
annotate.show_linenr::
|
|
When showing source code if this option is 'true',
|
|
line numbers are printed as below.
|
|
|
|
│1628 if (type & PERF_SAMPLE_IDENTIFIER) {
|
|
│ ↓ jne 508
|
|
│1628 data->id = *array;
|
|
│1629 array++;
|
|
│1630 }
|
|
|
|
However if this option is 'false', they aren't printed as below.
|
|
Default is 'false'.
|
|
|
|
│ if (type & PERF_SAMPLE_IDENTIFIER) {
|
|
│ ↓ jne 508
|
|
│ data->id = *array;
|
|
│ array++;
|
|
│ }
|
|
|
|
annotate.show_nr_jumps::
|
|
Let's see a part of assembly code.
|
|
|
|
│1382: movb $0x1,-0x270(%rbp)
|
|
|
|
If use this, the number of branches jumping to that address can be printed as below.
|
|
Default is 'false'.
|
|
|
|
│1 1382: movb $0x1,-0x270(%rbp)
|
|
|
|
annotate.show_total_period::
|
|
To compare two records on an instruction base, with this option
|
|
provided, display total number of samples that belong to a line
|
|
in assembly code. If this option is 'true', total periods are printed
|
|
instead of percent values as below.
|
|
|
|
302 │ mov %eax,%eax
|
|
|
|
But if this option is 'false', percent values for overhead are printed i.e.
|
|
Default is 'false'.
|
|
|
|
99.93 │ mov %eax,%eax
|
|
|
|
annotate.offset_level::
|
|
Default is '1', meaning just jump targets will have offsets show right beside
|
|
the instruction. When set to '2' 'call' instructions will also have its offsets
|
|
shown, 3 or higher will show offsets for all instructions.
|
|
|
|
hist.*::
|
|
hist.percentage::
|
|
This option control the way to calculate 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::
|
|
This option controls display of column headers (like 'Overhead' and 'Symbol')
|
|
in 'report' and 'top'. If this option is false, they are hidden.
|
|
This option is only applied to TUI.
|
|
|
|
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), 'dwarf' and 'lbr'.
|
|
The value of 'dwarf' is effective only if perf detect needed library
|
|
(libunwind or a recent version of libdw).
|
|
'lbr' only work for cpus that support it.
|
|
|
|
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, the default size will be used if omitted.
|
|
|
|
call-graph.print-type::
|
|
The print-types can be graph (graph absolute), fractal (graph relative),
|
|
flat and folded. 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 'fractal' format. 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.
|
|
If 'flat' is used, single column and linear exposure of call chains.
|
|
'folded' mean call chains are displayed in a line, separated by semicolons.
|
|
|
|
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.
|
|
|
|
If this option is not set and report.children or top.children is
|
|
set to true (or the equivalent command line option is given),
|
|
the default value of this option is changed to 'caller' for the
|
|
execution of 'perf report' or 'perf top'. Other commands will
|
|
still default to 'callee'.
|
|
|
|
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 threshold. Default is 0.5 (%). The overhead is calculated
|
|
by value depends on call-graph.print-type.
|
|
|
|
call-graph.print-limit::
|
|
This is a maximum number of lines of callchain printed for a single
|
|
histogram entry. Default is 0 which means no limitation.
|
|
|
|
report.*::
|
|
report.sort_order::
|
|
Allows changing the default sort order from "comm,dso,symbol" to
|
|
some other default, for instance "sym,dso" may be more fitting for
|
|
kernel developers.
|
|
report.percent-limit::
|
|
This one is mostly the same as call-graph.threshold but works for
|
|
histogram entries. Entries having an overhead lower than this
|
|
percentage will not be printed. Default is '0'. If percent-limit
|
|
is '10', only entries which have more than 10% of overhead will be
|
|
printed.
|
|
|
|
report.queue-size::
|
|
This option sets up the maximum allocation size of the internal
|
|
event queue for ordering events. Default is 0, meaning no limit.
|
|
|
|
report.children::
|
|
'Children' means functions called from another function.
|
|
If this option is true, 'perf report' cumulates callchains of children
|
|
and show (accumulated) total overhead as well as 'Self' overhead.
|
|
Please refer to the 'perf report' manual. The default is 'true'.
|
|
|
|
report.group::
|
|
This option is to show event group information together.
|
|
Example output with this turned on, notice that there is one column
|
|
per event in the group, ref-cycles and cycles:
|
|
|
|
# group: {ref-cycles,cycles}
|
|
# ========
|
|
#
|
|
# Samples: 7K of event 'anon group { ref-cycles, cycles }'
|
|
# Event count (approx.): 6876107743
|
|
#
|
|
# Overhead Command Shared Object Symbol
|
|
# ................ ....... ................. ...................
|
|
#
|
|
99.84% 99.76% noploop noploop [.] main
|
|
0.07% 0.00% noploop ld-2.15.so [.] strcmp
|
|
0.03% 0.00% noploop [kernel.kallsyms] [k] timerqueue_del
|
|
|
|
top.*::
|
|
top.children::
|
|
Same as 'report.children'. So if it is enabled, the output of 'top'
|
|
command will have 'Children' overhead column as well as 'Self' overhead
|
|
column by default.
|
|
The default is 'true'.
|
|
|
|
man.*::
|
|
man.viewer::
|
|
This option can assign a tool to view manual pages when 'help'
|
|
subcommand was invoked. Supported tools are 'man', 'woman'
|
|
(with emacs client) and 'konqueror'. Default is 'man'.
|
|
|
|
New man viewer tool can be also added using 'man.<tool>.cmd'
|
|
or use different path using 'man.<tool>.path' config option.
|
|
|
|
pager.*::
|
|
pager.<subcommand>::
|
|
When the subcommand is run on stdio, determine whether it uses
|
|
pager or not based on this value. Default is 'unspecified'.
|
|
|
|
kmem.*::
|
|
kmem.default::
|
|
This option decides which allocator is to be analyzed if neither
|
|
'--slab' nor '--page' option is used. Default is 'slab'.
|
|
|
|
record.*::
|
|
record.build-id::
|
|
This option can be 'cache', 'no-cache' or 'skip'.
|
|
'cache' is to post-process data and save/update the binaries into
|
|
the build-id cache (in ~/.debug). This is the default.
|
|
But if this option is 'no-cache', it will not update the build-id cache.
|
|
'skip' skips post-processing and does not update the cache.
|
|
|
|
diff.*::
|
|
diff.order::
|
|
This option sets the number of columns to sort the result.
|
|
The default is 0, which means sorting by baseline.
|
|
Setting it to 1 will sort the result by delta (or other
|
|
compute method selected).
|
|
|
|
diff.compute::
|
|
This options sets the method for computing the diff result.
|
|
Possible values are 'delta', 'delta-abs', 'ratio' and
|
|
'wdiff'. Default is 'delta'.
|
|
|
|
SEE ALSO
|
|
--------
|
|
linkperf:perf[1]
|