[tip:perf/core] perf tools: add NO_BACKTRACE for application self-debugging

From: tip-bot for Irina Tirdea
Date: Sat Sep 08 2012 - 07:48:35 EST


Commit-ID: c9f08bee50c71b06685ccff8110e56a7c05662b7
Gitweb: http://git.kernel.org/tip/c9f08bee50c71b06685ccff8110e56a7c05662b7
Author: Irina Tirdea <irina.tirdea@xxxxxxxxx>
AuthorDate: Sat, 8 Sep 2012 03:43:23 +0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 7 Sep 2012 22:12:30 -0300

perf tools: add NO_BACKTRACE for application self-debugging

perf has support for self-debugging by defining dump_stack function.
This function uses backtrace and backtrace_symbols functions defined as
GNU extensions.

In Android, bionic does not offer support for these functions and
compilation will fail with the following error:

target C: libperf <= tools/perf/util/util.c
tools/perf/util/util.c:4:22: fatal error: execinfo.h: No such file or directory
compilation terminated.

Add a compile-time option (NO_BACKTRACE) to enable or disable
self-debugging functionality in perf. This can also help in debugging
since it offers the possibility to turn on/off printing the backtrace.

Signed-off-by: Irina Tirdea <irina.tirdea@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung.kim@xxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1347065004-15306-12-git-send-email-irina.tirdea@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/Makefile | 8 ++++++++
tools/perf/config/feature-tests.mak | 14 ++++++++++++++
tools/perf/util/util.c | 6 ++++++
3 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index afd5075..3eda492 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -755,6 +755,14 @@ else
endif
endif

+ifdef NO_BACKTRACE
+ BASIC_CFLAGS += -DNO_BACKTRACE
+else
+ ifneq ($(call try-cc,$(SOURCE_BACKTRACE),),y)
+ BASIC_CFLAGS += -DNO_BACKTRACE
+ endif
+endif
+
ifdef ASCIIDOC8
export ASCIIDOC8
endif
diff --git a/tools/perf/config/feature-tests.mak b/tools/perf/config/feature-tests.mak
index 2f1156a..116690a 100644
--- a/tools/perf/config/feature-tests.mak
+++ b/tools/perf/config/feature-tests.mak
@@ -179,3 +179,17 @@ int main(void)
}
endef
endif
+
+ifndef NO_BACKTRACE
+define SOURCE_BACKTRACE
+#include <execinfo.h>
+#include <stdio.h>
+
+int main(void)
+{
+ backtrace(NULL, 0);
+ backtrace_symbols(NULL, 0);
+ return 0;
+}
+endef
+endif
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 1b8775c..2055cf3 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -1,7 +1,9 @@
#include "../perf.h"
#include "util.h"
#include <sys/mman.h>
+#ifndef NO_BACKTRACE
#include <execinfo.h>
+#endif
#include <stdio.h>
#include <stdlib.h>

@@ -163,6 +165,7 @@ size_t hex_width(u64 v)
}

/* Obtain a backtrace and print it to stdout. */
+#ifndef NO_BACKTRACE
void dump_stack(void)
{
void *array[16];
@@ -177,3 +180,6 @@ void dump_stack(void)

free(strings);
}
+#else
+void dump_stack(void) {}
+#endif
--
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