Commit d2ff1b14 authored Nov 18, 2013 by David Ahern Committed by Arnaldo Carvalho de Melo Nov 27, 2013

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>

parent 6f8d67fa

tools/perf/util/session.c

+8 −2

Original line number	Diff line number	Diff line
		@@ -1522,6 +1522,9 @@ void perf_evsel__print_ip(struct perf_evsel evsel, union perf_event event,
		if (!node)
		break;

		if (node->sym && node->sym->ignore)
		goto next;

		if (print_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)
		printf("\n");

		callchain_cursor_advance(&callchain_cursor);

		stack_depth--;
		next:
		callchain_cursor_advance(&callchain_cursor);
		}

		} else {
		if (al.sym && al.sym->ignore)
		return;

		if (print_ip)
		printf("%16" PRIx64, sample->ip);