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perf report: Support data type profiling

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Enable type annotation when the 'type' sort key is used.

It shows type of variables the samples access at the moment.  Users can
see which types are accessed frequently.

  $ perf report -s dso,type --stdio
  ...
  # Overhead  Shared Object      Data Type
  # ........  .................  .........
  #
      35.47%  [kernel.kallsyms]  (unknown)
       1.62%  [kernel.kallsyms]  struct sched_entry
       1.23%  [kernel.kallsyms]  struct cfs_rq
       0.83%  [kernel.kallsyms]  struct task_struct
       0.34%  [kernel.kallsyms]  struct list_head
       0.30%  [kernel.kallsyms]  struct mem_cgroup
  ...

Committer testing:

With the perf.data file collected in the previous cset:

  # perf report --stdio -s type
  # To display the perf.data header info, please use --header/--header-only options.
  #
  #
  # Total Lost Samples: 0
  #
  # Samples: 4  of event 'cpu_atom/mem-loads,ldlat=30/P'
  # Event count (approx.): 7
  #
  # Overhead  Data Type
  # ........  .........
  #
      42.86%  struct list_head
      42.86%  (unknown)
      14.29%  char

  #
  # (Tip: To record callchains for each sample: perf record -g)
  #
  # perf report --stdio -s dso,type
  # To display the perf.data header info, please use --header/--header-only options.
  #
  #
  # Total Lost Samples: 0
  #
  # Samples: 4  of event 'cpu_atom/mem-loads,ldlat=30/P'
  # Event count (approx.): 7
  #
  # Overhead  Shared Object         Data Type
  # ........  ....................  .........
  #
      42.86%  [kernel.kallsyms]     struct list_head
      28.57%  libc.so.6             (unknown)
      14.29%  [kernel.kallsyms]     char
      14.29%  ld-linux-x86-64.so.2  (unknown)

  #
  # (Tip: Save output of perf stat using: perf stat record <target workload>)
  #
  #

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: linux-toolchains@vger.kernel.org
Cc: linux-trace-devel@vger.kernel.org
Link: https://lore.kernel.org/r/20231213001323.718046-10-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2023-12-12 16:13:15 -08:00 committed by Arnaldo Carvalho de Melo
parent 2f2c41bdd8
commit 81e57deec3
1 changed files with 13 additions and 2 deletions
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15
tools/perf/builtin-report.c
View file

@ -96,6 +96,7 @@ struct report {
bool stitch_lbr;
bool disable_order;
bool skip_empty;
bool data_type;
int max_stack;
struct perf_read_values show_threads_values;
const char *pretty_printing_style;
@ -170,7 +171,7 @@ static int hist_iter__report_callback(struct hist_entry_iter *iter,
struct mem_info *mi;
struct branch_info *bi;
if (!ui__has_annotation() && !rep->symbol_ipc)
if (!ui__has_annotation() && !rep->symbol_ipc && !rep->data_type)
return 0;
if (sort__mode == SORT_MODE__BRANCH) {
@ -1639,6 +1640,16 @@ int cmd_report(int argc, const char **argv)
sort_order = NULL;
}
if (sort_order && strstr(sort_order, "type")) {
report.data_type = true;
annotate_opts.annotate_src = false;
#ifndef HAVE_DWARF_GETLOCATIONS_SUPPORT
pr_err("Error: Data type profiling is disabled due to missing DWARF support\n");
goto error;
#endif
}
if (strcmp(input_name, "-") != 0)
setup_browser(true);
else
@ -1697,7 +1708,7 @@ int cmd_report(int argc, const char **argv)
* so don't allocate extra space that won't be used in the stdio
* implementation.
*/
if (ui__has_annotation() || report.symbol_ipc ||
if (ui__has_annotation() || report.symbol_ipc || report.data_type ||
report.total_cycles_mode) {
ret = symbol__annotation_init();
if (ret < 0)