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perf evsel: Skip ignored symbols while printing callchain 

Allows a command to have a symbol_filter controlled by the user to skip
certain functions in a backtrace. One example is to allow the user to
reduce repeating patterns like:

    do_select  core_sys_select  sys_select

to just sys_select when dumping callchains, consuming less real estate
on the screen while still conveying the essential message - the process
is in a select call.

This option is leveraged by the upcoming timehist command.

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1384806771-2945-2-git-send-email-dsahern@gmail.com
[ Checked if al.sym is NULL before touching al.sym->ignored, as noted by Adrian Hunter ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
David Ahern 2013-11-18 13:32:44 -07:00 committed by Arnaldo Carvalho de Melo
parent 6f8d67fa0c
commit d2ff1b1499
1 changed files with 8 additions and 2 deletions
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10
tools/perf/util/session.c
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@ -1522,6 +1522,9 @@ void perf_evsel__print_ip(struct perf_evsel *evsel, union perf_event *event,
if (!node) if (!node)
break; break;
if (node->sym && node->sym->ignore)
goto next;
if (print_ip) if (print_ip)
printf("%c%16" PRIx64, s, node->ip); printf("%c%16" PRIx64, s, node->ip);
@ -1544,12 +1547,15 @@ void perf_evsel__print_ip(struct perf_evsel *evsel, union perf_event *event,
if (!print_oneline) if (!print_oneline)
printf("\n"); printf("\n");
callchain_cursor_advance(&callchain_cursor);
stack_depth--; stack_depth--;
next:
callchain_cursor_advance(&callchain_cursor);
} }
} else { } else {
if (al.sym && al.sym->ignore)
return;
if (print_ip) if (print_ip)
printf("%16" PRIx64, sample->ip); printf("%16" PRIx64, sample->ip);