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Like in 'perf report', we want to hide empty events in the 'perf annotate'
output. This is consistent when the option is set in perf report.
For example, the following command would use 3 events including dummy.
$ perf mem record -a -- perf test -w noploop
$ perf evlist
cpu/mem-loads,ldlat=30/P
cpu/mem-stores/P
dummy:u
Just using perf annotate with --group will show the all 3 events.
$ perf annotate --group --stdio | head
Percent | Source code & Disassembly of ...
--------------------------------------------------------------
: 0 0xe060 <_dl_relocate_object>:
0.00 0.00 0.00 : e060: pushq %rbp
0.00 0.00 0.00 : e061: movq %rsp, %rbp
0.00 0.00 0.00 : e064: pushq %r15
0.00 0.00 0.00 : e066: movq %rdi, %r15
0.00 0.00 0.00 : e069: pushq %r14
0.00 0.00 0.00 : e06b: pushq %r13
0.00 0.00 0.00 : e06d: movl %edx, %r13d
Now with --skip-empty, it'll hide the last dummy event.
$ perf annotate --group --stdio --skip-empty | head
Percent | Source code & Disassembly of ...
------------------------------------------------------
: 0 0xe060 <_dl_relocate_object>:
0.00 0.00 : e060: pushq %rbp
0.00 0.00 : e061: movq %rsp, %rbp
0.00 0.00 : e064: pushq %r15
0.00 0.00 : e066: movq %rdi, %r15
0.00 0.00 : e069: pushq %r14
0.00 0.00 : e06b: pushq %r13
0.00 0.00 : e06d: movl %edx, %r13d
Committer testing:
root@x1:~# perf evlist
cpu_atom/mem-loads,ldlat=30/P
cpu_atom/mem-stores/P
dummy:u
root@x1:~#
Before:
root@x1:~# perf annotate --group --stdio2 do_lookup_x | head -25
Samples: 20 of events 'cpu_atom/mem-loads,ldlat=30/P, cpu_atom/mem-stores/P, dummy:u', 4000 Hz, Event count (approx.): 769079, [percent: local period]
do_lookup_x() /usr/lib64/ld-linux-x86-64.so.2
Percent 0x9900 <do_lookup_x>:
pushq %rbp
movq %rsp,%rbp
pushq %r15
pushq %r14
pushq %r13
pushq %r12
pushq %rbx
subq $0x88,%rsp
movq %rdi,-0x50(%rbp)
movl 8(%r9),%edi
movq 0x10(%rbp),%r12
movq 0x28(%rbp),%r10
movq %rdx,-0x70(%rbp)
movq %rcx,-0x58(%rbp)
movq %rdi,%r11
0.00 5.73 0.00 movq %r8,-0x68(%rbp)
movq (%r9),%r8
movl %esi,%eax
8.30 0.00 0.00 movl 0x30(%rbp),%r9d
movl %esi,%r15d
shrl $6, %eax
movq %r8,%r13
root@x1:~#
After:
root@x1:~# perf annotate --group --skip-empty --stdio2 do_lookup_x | head -25
Samples: 20 of events 'cpu_atom/mem-loads,ldlat=30/P, cpu_atom/mem-stores/P', 4000 Hz, Event count (approx.): 769079, [percent: local period]
do_lookup_x() /usr/lib64/ld-linux-x86-64.so.2
Percent 0x9900 <do_lookup_x>:
pushq %rbp
movq %rsp,%rbp
pushq %r15
pushq %r14
pushq %r13
pushq %r12
pushq %rbx
subq $0x88,%rsp
movq %rdi,-0x50(%rbp)
movl 8(%r9),%edi
movq 0x10(%rbp),%r12
movq 0x28(%rbp),%r10
movq %rdx,-0x70(%rbp)
movq %rcx,-0x58(%rbp)
movq %rdi,%r11
0.00 5.73 movq %r8,-0x68(%rbp)
movq (%r9),%r8
movl %esi,%eax
8.30 0.00 movl 0x30(%rbp),%r9d
movl %esi,%r15d
shrl $6, %eax
movq %r8,%r13
root@x1:~#
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240803211332.1107222-6-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
175 lines
4.5 KiB
Plaintext
175 lines
4.5 KiB
Plaintext
perf-annotate(1)
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================
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NAME
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----
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perf-annotate - Read perf.data (created by perf record) and display annotated code
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SYNOPSIS
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--------
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[verse]
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'perf annotate' [-i <file> | --input=file] [symbol_name]
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DESCRIPTION
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-----------
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This command reads the input file and displays an annotated version of the
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code. If the object file has debug symbols then the source code will be
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displayed alongside assembly code.
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If there is no debug info in the object, then annotated assembly is displayed.
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OPTIONS
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-------
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-i::
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--input=<file>::
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Input file name. (default: perf.data unless stdin is a fifo)
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-d::
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--dsos=<dso[,dso...]>::
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Only consider symbols in these dsos.
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-s::
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--symbol=<symbol>::
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Symbol to annotate.
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-f::
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--force::
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Don't do ownership validation.
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-v::
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--verbose::
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Be more verbose. (Show symbol address, etc)
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-q::
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--quiet::
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Do not show any warnings or messages. (Suppress -v)
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-n::
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--show-nr-samples::
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Show the number of samples for each symbol
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-D::
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--dump-raw-trace::
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Dump raw trace in ASCII.
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-k::
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--vmlinux=<file>::
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vmlinux pathname.
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--ignore-vmlinux::
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Ignore vmlinux files.
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--itrace::
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Options for decoding instruction tracing data. The options are:
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include::itrace.txt[]
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To disable decoding entirely, use --no-itrace.
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-m::
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--modules::
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Load module symbols. WARNING: use only with -k and LIVE kernel.
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-l::
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--print-line::
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Print matching source lines (may be slow).
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-P::
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--full-paths::
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Don't shorten the displayed pathnames.
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--stdio:: Use the stdio interface.
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--stdio2:: Use the stdio2 interface, non-interactive, uses the TUI formatting.
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--stdio-color=<mode>::
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'always', 'never' or 'auto', allowing configuring color output
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via the command line, in addition to via "color.ui" .perfconfig.
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Use '--stdio-color always' to generate color even when redirecting
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to a pipe or file. Using just '--stdio-color' is equivalent to
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using 'always'.
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--tui:: Use the TUI interface. Use of --tui requires a tty, if one is not
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present, as when piping to other commands, the stdio interface is
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used. This interfaces starts by centering on the line with more
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samples, TAB/UNTAB cycles through the lines with more samples.
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--gtk:: Use the GTK interface.
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-C::
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--cpu=<cpu>:: Only report samples for the list of CPUs provided. Multiple CPUs can
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be provided as a comma-separated list with no space: 0,1. Ranges of
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CPUs are specified with -: 0-2. Default is to report samples on all
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CPUs.
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--asm-raw::
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Show raw instruction encoding of assembly instructions.
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--show-total-period:: Show a column with the sum of periods.
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--source::
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Interleave source code with assembly code. Enabled by default,
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disable with --no-source.
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--symfs=<directory>::
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Look for files with symbols relative to this directory.
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-M::
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--disassembler-style=:: Set disassembler style for objdump.
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--addr2line=<path>::
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Path to addr2line binary.
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--objdump=<path>::
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Path to objdump binary.
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--prefix=PREFIX::
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--prefix-strip=N::
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Remove first N entries from source file path names in executables
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and add PREFIX. This allows to display source code compiled on systems
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with different file system layout.
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--skip-missing::
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Skip symbols that cannot be annotated.
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--group::
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Show event group information together
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--demangle::
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Demangle symbol names to human readable form. It's enabled by default,
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disable with --no-demangle.
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--demangle-kernel::
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Demangle kernel symbol names to human readable form (for C++ kernels).
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--percent-type::
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Set annotation percent type from following choices:
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global-period, local-period, global-hits, local-hits
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The local/global keywords set if the percentage is computed
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in the scope of the function (local) or the whole data (global).
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The period/hits keywords set the base the percentage is computed
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on - the samples period or the number of samples (hits).
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--percent-limit::
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Do not show functions which have an overhead under that percent on
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stdio or stdio2 (Default: 0). Note that this is about selection of
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functions to display, not about lines within the function.
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--data-type[=TYPE_NAME]::
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Display data type annotation instead of code. It infers data type of
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samples (if they are memory accessing instructions) using DWARF debug
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information. It can take an optional argument of data type name. In
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that case it'd show annotation for the type only, otherwise it'd show
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all data types it finds.
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--type-stat::
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Show stats for the data type annotation.
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--skip-empty::
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Do not display empty (or dummy) events.
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SEE ALSO
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--------
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linkperf:perf-record[1], linkperf:perf-report[1]
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