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perf tools: Add dump_stack function 

To help in debugging the tools, provides functionality roughly similar
to the function with the same name in the kernel.

Copied from glibc backtrace function man page.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-6nw2sak21bqy8h1m2syyo816@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2012-08-07 23:32:05 -03:00
parent a7cb8863dd
commit dc4552bf71
2 changed files with 21 additions and 0 deletions
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19
tools/perf/util/util.c
View File

@ -1,6 +1,9 @@
#include "../perf.h" #include "../perf.h"
#include "util.h" #include "util.h"
#include <sys/mman.h> #include <sys/mman.h>
#include <execinfo.h>
#include <stdio.h>
#include <stdlib.h>
/* /*
* XXX We need to find a better place for these things... * XXX We need to find a better place for these things...
@ -158,3 +161,19 @@ size_t hex_width(u64 v)
return n; return n;
} }
/* Obtain a backtrace and print it to stdout. */
void dump_stack(void)
{
void *array[16];
size_t size = backtrace(array, ARRAY_SIZE(array));
char **strings = backtrace_symbols(array, size);
size_t i;
printf("Obtained %zd stack frames.\n", size);
for (i = 0; i < size; i++)
printf("%s\n", strings[i]);
free(strings);
}

2
tools/perf/util/util.h
View File

@ -266,4 +266,6 @@ size_t hex_width(u64 v);
char *rtrim(char *s); char *rtrim(char *s);
void dump_stack(void);
#endif #endif