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perf tools: Do not disable source line lookup just because of 1 failure

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Looking up an ip's source file name and line number does not succeed
always.  Current logic disables the lookup for a dso entirely on any
failure.  Change it so that disabling never happens if there has ever
been a successful lookup for that dso but disable if the first 123
lookups fail.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.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 <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1386055390-13757-8-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2013-12-03 09:23:10 +02:00 committed by Arnaldo Carvalho de Melo
parent 0058aef65e
commit 906049c827
3 changed files with 18 additions and 4 deletions
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1
tools/perf/util/dso.c
View file

@ -451,6 +451,7 @@ struct dso *dso__new(const char *name)
dso->sorted_by_name = 0;
dso->has_build_id = 0;
dso->has_srcline = 1;
dso->a2l_fails = 1;
dso->kernel = DSO_TYPE_USER;
dso->needs_swap = DSO_SWAP__UNSET;
INIT_LIST_HEAD(&dso->node);

1
tools/perf/util/dso.h
View file

@ -79,6 +79,7 @@ struct dso {
struct rb_root cache;
void *a2l;
char *symsrc_filename;
unsigned int a2l_fails;
enum dso_kernel_type kernel;
enum dso_swap_type needs_swap;
enum dso_binary_type symtab_type;

20
tools/perf/util/srcline.c
View file

@ -244,6 +244,12 @@ void dso__free_a2l(struct dso *dso __maybe_unused)
#endif /* HAVE_LIBBFD_SUPPORT */
/*
* Number of addr2line failures (without success) before disabling it for that
* dso.
*/
#define A2L_FAIL_LIMIT 123
char *get_srcline(struct dso *dso, unsigned long addr)
{
char *file = NULL;
@ -268,15 +274,21 @@ char *get_srcline(struct dso *dso, unsigned long addr)
if (!addr2line(dso_name, addr, &file, &line, dso))
goto out;
if (asprintf(&srcline, "%s:%u", file, line) < 0)
srcline = SRCLINE_UNKNOWN;
if (asprintf(&srcline, "%s:%u", file, line) < 0) {
free(file);
goto out;
}
dso->a2l_fails = 0;
free(file);
return srcline;
out:
dso->has_srcline = 0;
dso__free_a2l(dso);
if (dso->a2l_fails && ++dso->a2l_fails > A2L_FAIL_LIMIT) {
dso->has_srcline = 0;
dso__free_a2l(dso);
}
return SRCLINE_UNKNOWN;
}