linux-kernel - Re: [PATCH v2 0/5] perf report: Show inline stack

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Date:   Wed, 7 Dec 2016 11:30:07 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     "Jin, Yao" <yao.jin@...ux.intel.com>
Cc:     jolsa@...nel.org, Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com
Subject: Re: [PATCH v2 0/5] perf report: Show inline stack

Em Wed, Dec 07, 2016 at 01:38:29PM +0800, Jin, Yao escreveu:
> So sorry, please ignore this v2 patch series.
> 
> I missed the Arnaldo other comments which were added in the code.
> 
> I will RESEND v2 patch series later.

No problem, but in the future just bump the version, i.e. ask for me to
disregard v2 and wait for v3 :-)

And thanks a lot for taking the time to address my requests and
suggestions, really appreciated!

- Arnaldo
 
> 
> On 12/7/2016 9:30 PM, Jin Yao wrote:
> > 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(-)
> >