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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>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.