linux-kernel - Re: [PATCH v4 0/5] perf report: Show inline stack

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Date:   Tue, 14 Mar 2017 09:16:03 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     acme@...nel.org, jolsa@...nel.org
Cc:     Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, milian.wolff@...b.com
Subject: Re: [PATCH v4 0/5] perf report: Show inline stack

Hi,

Any comments for this v4 patch series?

Thanks

Jin Yao


On 3/3/2017 6:43 PM, Jin Yao wrote:
> v4: Remove the options "--inline-line" and "--inline-name". Just use
>      a new option "--inline" to print the inline function information.
>      The policy is if the inline function name can be resolved then
>      print the name in priority. If the name can't be resolved, then
>      print the source line number.
>
>      For example:
>      perf report --stdio --inline
>
>      0.69%     0.00%  inline   ld-2.23.so           [.] dl_main
>             |
>             ---dl_main
>                |
>                 --0.56%--_dl_relocate_object
>                           |
>                           ---_dl_relocate_object (inline)
>                              elf_dynamic_do_Rela (inline)
>    
>      Following 3 patches are updated according to this change.
>      perf report: Show inline stack in browser mode
>      perf report: Show inline stack in stdio mode
>      perf report: Create new inline option
>
>      Followings are not changed.
>      perf report: Find the inline stack for a given address
>      perf report: Refactor common code in srcline.c
>
> v3: Iterate on RIPs of all callchain entries to check if the RIP is in
>      inline functions.
>
>      Reverse the order of the inliner printout if necessary.
>
>      Provide new options "--inline-line" / "--inline-name" to print
>      inline function name or print inline function source line.
>
> 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 -> dso__parse_addr_inlines
>         free_inline_node -> inline_node__delete
>
>      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 new inline option
>    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           | 168 ++++++++++++++++++++--
>   tools/perf/ui/stdio/hist.c               |  76 +++++++++-
>   tools/perf/util/hist.c                   |   5 +
>   tools/perf/util/sort.h                   |   1 +
>   tools/perf/util/srcline.c                | 237 +++++++++++++++++++++++++++----
>   tools/perf/util/symbol-elf.c             |   5 +
>   tools/perf/util/symbol.h                 |   5 +-
>   tools/perf/util/util.h                   |  16 +++
>   10 files changed, 481 insertions(+), 38 deletions(-)
>