Hi,
perf-annotate has little bugs so I fix them.
I'd appreciate some feedback on this patchset. :)
Thanks,
Taeung
v2:
- more clearly commit log messages (Arnaldo)
- rebased on current acme/perf/core
Taeung Song (3):
perf annotate: Fix a bug reading link name from a build-id file
perf annotate: Fix a bug of division by zero when calculating percent
perf annotate: Fix missing number of samples
tools/perf/util/annotate.c | 24 +++++++++++++++++++-----
tools/perf/util/annotate.h | 2 +-
2 files changed, 20 insertions(+), 6 deletions(-)
--
2.7.4
If running 'perf annotate --stdio -l --show-total-period',
you can see a problem showing only zero '0' for number of samples.
Before:
$ perf annotate --stdio -l --show-total-period
...
0 : 400816: push %rbp
0 : 400817: mov %rsp,%rbp
0 : 40081a: mov %edi,-0x24(%rbp)
0 : 40081d: mov %rsi,-0x30(%rbp)
0 : 400821: mov -0x24(%rbp),%eax
0 : 400824: mov -0x30(%rbp),%rdx
0 : 400828: mov (%rdx),%esi
0 : 40082a: mov $0x0,%edx
...
The reason is number of samples aren't set
in symbol__get_source_line(). so set it ordinarily.
After:
$ perf annotate --stdio -l --show-total-period
...
3 : 400816: push %rbp
4 : 400817: mov %rsp,%rbp
0 : 40081a: mov %edi,-0x24(%rbp)
0 : 40081d: mov %rsi,-0x30(%rbp)
1 : 400821: mov -0x24(%rbp),%eax
2 : 400824: mov -0x30(%rbp),%rdx
0 : 400828: mov (%rdx),%esi
1 : 40082a: mov $0x0,%edx
...
Cc: Namhyung Kim <[email protected]>
Cc: Jiri Olsa <[email protected]>
Signed-off-by: Taeung Song <[email protected]>
---
tools/perf/util/annotate.c | 6 ++++--
tools/perf/util/annotate.h | 2 +-
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index db3ebf1..23f36cb 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1665,7 +1665,7 @@ static int symbol__get_source_line(struct symbol *sym, struct map *map,
start = map__rip_2objdump(map, sym->start);
for (i = 0; i < len; i++) {
- u64 offset;
+ u64 offset, nr_samples;
double percent_max = 0.0;
src_line->nr_pcnt = nr_pcnt;
@@ -1674,12 +1674,14 @@ static int symbol__get_source_line(struct symbol *sym, struct map *map,
double percent = 0.0;
h = annotation__histogram(notes, evidx + k);
+ nr_samples = h->addr[i];
if (h->sum)
- percent = 100.0 * h->addr[i] / h->sum;
+ percent = 100.0 * nr_samples / h->sum;
if (percent > percent_max)
percent_max = percent;
src_line->samples[k].percent = percent;
+ src_line->samples[k].nr = nr_samples;
}
if (percent_max <= 0.5)
diff --git a/tools/perf/util/annotate.h b/tools/perf/util/annotate.h
index 09776b5..948aa8e 100644
--- a/tools/perf/util/annotate.h
+++ b/tools/perf/util/annotate.h
@@ -98,7 +98,7 @@ struct cyc_hist {
struct source_line_samples {
double percent;
double percent_sum;
- double nr;
+ u64 nr;
};
struct source_line {
--
2.7.4
It is wrong way to read link name from a build-id file.
Because a build-id file is not symbolic link
but build-id directory of it is symbolic link, so fix it.
For example, if build-id file name gotten from
dso__build_id_filename() is as below,
/root/.debug/.build-id/4f/75c7d197c951659d1c1b8b5fd49bcdf8f3f8b1/elf
To correctly read link name of build-id,
use the build-id dir path that is a symbolic link,
instead of the above build-id file name like below.
/root/.debug/.build-id/4f/75c7d197c951659d1c1b8b5fd49bcdf8f3f8b1
Cc: Namhyung Kim <[email protected]>
Cc: Jiri Olsa <[email protected]>
Signed-off-by: Taeung Song <[email protected]>
---
tools/perf/util/annotate.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 22cd1db..20de715 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1307,6 +1307,7 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil
{
char linkname[PATH_MAX];
char *build_id_filename;
+ char *build_id_path = NULL;
if (dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
!dso__is_kcore(dso))
@@ -1322,8 +1323,14 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil
goto fallback;
}
+ build_id_path = strdup(filename);
+ if (!build_id_path)
+ return -1;
+
+ dirname(build_id_path);
+
if (dso__is_kcore(dso) ||
- readlink(filename, linkname, sizeof(linkname)) < 0 ||
+ readlink(build_id_path, linkname, sizeof(linkname)) < 0 ||
strstr(linkname, DSO__NAME_KALLSYMS) ||
access(filename, R_OK)) {
fallback:
@@ -1335,6 +1342,7 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil
__symbol__join_symfs(filename, filename_size, dso->long_name);
}
+ free(build_id_path);
return 0;
}
--
2.7.4
Currently perf-annotate with --print-line can print
-nan(0x8000000000000) because of division by zero
when calculating percent. The division by zero happen
when a sum of samples is zero in symbol__get_source_line(),
so fix it.
For examples,
After running 'perf record' like below,
$ perf record -e "{cycles,page-faults,branch-misses}" ./a.out
Before:
$ perf annotate --stdio -l
Sorted summary for file /home/taeung/workspace/a.out
----------------------------------------------
32.89 -nan 7.04 a.c:38
25.14 -nan 0.00 a.c:34
16.26 -nan 56.34 a.c:31
15.88 -nan 1.41 a.c:37
5.67 -nan 0.00 a.c:39
1.13 -nan 35.21 a.c:26
0.95 -nan 0.00 a.c:44
0.57 -nan 0.00 a.c:32
Percent | Source code & Disassembly of a.out for cycles (529 samples)
-----------------------------------------------------------------------------------------
:
...
a.c:26 0.57 -nan 4.23 : 40081a: mov %edi,-0x24(%rbp)
a.c:26 0.00 -nan 9.86 : 40081d: mov %rsi,-0x30(%rbp)
...
However, if a sum of samples is zero (e.g. 'page-faults'),
skip calculating percent.
After:
$ perf annotate --stdio -l
Sorted summary for file /home/taeung/workspace/a.out
----------------------------------------------
32.89 0.00 7.04 a.c:38
25.14 0.00 0.00 a.c:34
16.26 0.00 56.34 a.c:31
15.88 0.00 1.41 a.c:37
5.67 0.00 0.00 a.c:39
1.13 0.00 35.21 a.c:26
0.95 0.00 0.00 a.c:44
0.57 0.00 0.00 a.c:32
Percent | Source code & Disassembly of old for cycles (529 samples)
-----------------------------------------------------------------------------------------
:
...
a.c:26 0.57 0.00 4.23 : 40081a: mov %edi,-0x24(%rbp)
a.c:26 0.00 0.00 9.86 : 40081d: mov %rsi,-0x30(%rbp)
...
Cc: Namhyung Kim <[email protected]>
Cc: Jiri Olsa <[email protected]>
Signed-off-by: Taeung Song <[email protected]>
---
tools/perf/util/annotate.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 20de715..db3ebf1 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1671,11 +1671,15 @@ static int symbol__get_source_line(struct symbol *sym, struct map *map,
src_line->nr_pcnt = nr_pcnt;
for (k = 0; k < nr_pcnt; k++) {
+ double percent = 0.0;
+
h = annotation__histogram(notes, evidx + k);
- src_line->samples[k].percent = 100.0 * h->addr[i] / h->sum;
+ if (h->sum)
+ percent = 100.0 * h->addr[i] / h->sum;
- if (src_line->samples[k].percent > percent_max)
- percent_max = src_line->samples[k].percent;
+ if (percent > percent_max)
+ percent_max = percent;
+ src_line->samples[k].percent = percent;
}
if (percent_max <= 0.5)
--
2.7.4