[PATCH v2 0/5] perf report: Show inline stack

Jin Yao
2016-12-07T05:31:35Z

v2: Thanks so much for Arnaldo's comments!
The modifications are:

1. Divide v1 patch "perf report: Find the inline stack for a
given address" into 2 patches:
a. perf report: Refactor common code in srcline.c
b. perf report: Find the inline stack for a given address

Some function names are changed:
dso_name_get -> dso__name
ilist_apend -> inline_list__append
get_inline_node -> inline__node
free_inline_node -> inline_node__free

2. Since the function name are changed, update following patches
accordingly.
a. perf report: Show inline stack in stdio mode
b. perf report: Show inline stack in browser mode

3. Rebase to latest perf/core branch. This patch is impacted.
a. perf report: Create a new option "--inline"

v1: Initial post

It would be useful for perf to support a mode to query the
inline stack for callgraph addresses. This would simplify
finding the right code in code that does a lot of inlining.

For example, the c code:

static inline void f3(void)
{
int i;
for (i = 0; i < 1000;) {

if(i%2)
i++;
else
i++;
}
printf("hello f3\n"); /* D */
}

/* < CALLCHAIN: f2 <- f1 > */
static inline void f2(void)
{
int i;
for (i = 0; i < 100; i++) {
f3(); /* C */
}
}

/* < CALLCHAIN: f1 <- main > */
static inline void f1(void)
{
int i;
for (i = 0; i < 100; i++) {
f2(); /* B */
}
}

/* < CALLCHAIN: main <- TOP > */
int main()
{
struct timeval tv;
time_t start, end;

gettimeofday(&tv, NULL);
start = end = tv.tv_sec;
while((end - start) < 5) {
f1(); /* A */
gettimeofday(&tv, NULL);
end = tv.tv_sec;
}
return 0;
}

The printed inline stack is:

0.05% test2 test2 [.] main
|
---/home/perf-dev/lck-2867/test/test2.c:27 (inline)
/home/perf-dev/lck-2867/test/test2.c:35 (inline)
/home/perf-dev/lck-2867/test/test2.c:45 (inline)
/home/perf-dev/lck-2867/test/test2.c:61 (inline)

I tag A/B/C/D in above c code to indicate the source line,
actually the inline stack is equal to:

0.05% test2 test2 [.] main
|
---D
C
B
A

Jin Yao (5):
perf report: Refactor common code in srcline.c
perf report: Find the inline stack for a given address
perf report: Create a new option "--inline"
perf report: Show inline stack in stdio mode
perf report: Show inline stack in browser mode

tools/perf/Documentation/perf-report.txt | 4 +
tools/perf/builtin-report.c | 2 +
tools/perf/ui/browsers/hists.c | 98 ++++++++++++++-
tools/perf/ui/stdio/hist.c | 56 ++++++++-
tools/perf/util/hist.c | 5 +
tools/perf/util/sort.h | 1 +
tools/perf/util/srcline.c | 207 ++++++++++++++++++++++++++-----
tools/perf/util/symbol.h | 3 +-
tools/perf/util/util.h | 14 +++
9 files changed, 356 insertions(+), 34 deletions(-)

--
2.7.4