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Subject[tip:perf/urgent] perf annotate: Allow setting the offset level in .perfconfig
Commit-ID:  43c4023152a9c5742948ac919e58ade127fa4e2e
Gitweb: https://git.kernel.org/tip/43c4023152a9c5742948ac919e58ade127fa4e2e
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Thu, 12 Apr 2018 15:23:02 -0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 13 Apr 2018 10:00:05 -0300

perf annotate: Allow setting the offset level in .perfconfig

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>
---
tools/perf/Documentation/perf-config.txt | 5 +++++
tools/perf/util/annotate.c | 15 ++++++++++++---
2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index 5b4fff3adc4b..32f4a898e3f2 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -334,6 +334,11 @@ annotate.*::

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 -
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 5edc565d86c4..536ee148bff8 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -2649,10 +2649,11 @@ int __annotation__scnprintf_samples_period(struct annotation *notes,
*/
static struct annotation_config {
const char *name;
- bool *value;
+ void *value;
} annotation__configs[] = {
ANNOTATION__CFG(hide_src_code),
ANNOTATION__CFG(jump_arrows),
+ ANNOTATION__CFG(offset_level),
ANNOTATION__CFG(show_linenr),
ANNOTATION__CFG(show_nr_jumps),
ANNOTATION__CFG(show_nr_samples),
@@ -2684,8 +2685,16 @@ static int annotation__config(const char *var, const char *value,

if (cfg == NULL)
pr_debug("%s variable unknown, ignoring...", var);
- else
- *cfg->value = perf_config_bool(name, value);
+ else if (strcmp(var, "annotate.offset_level") == 0) {
+ perf_config_int(cfg->value, name, value);
+
+ if (*(int *)cfg->value > ANNOTATION__MAX_OFFSET_LEVEL)
+ *(int *)cfg->value = ANNOTATION__MAX_OFFSET_LEVEL;
+ else if (*(int *)cfg->value < ANNOTATION__MIN_OFFSET_LEVEL)
+ *(int *)cfg->value = ANNOTATION__MIN_OFFSET_LEVEL;
+ } else {
+ *(bool *)cfg->value = perf_config_bool(name, value);
+ }
return 0;
}

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