perf report: Support data type profiling

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>

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 178fb602bc982d52183e47d073764bc23a465b08..f2ed2b7e80a32649095f123b63b3ed8ecaf42cc9 100644 (file)
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -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)