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perf tools: Do not disable source line lookup just because of 1 failure
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>
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@ -451,6 +451,7 @@ struct dso *dso__new(const char *name)
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dso->sorted_by_name = 0;
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dso->has_build_id = 0;
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dso->has_srcline = 1;
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dso->a2l_fails = 1;
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dso->kernel = DSO_TYPE_USER;
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dso->needs_swap = DSO_SWAP__UNSET;
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INIT_LIST_HEAD(&dso->node);
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@ -79,6 +79,7 @@ struct dso {
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struct rb_root cache;
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void *a2l;
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char *symsrc_filename;
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unsigned int a2l_fails;
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enum dso_kernel_type kernel;
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enum dso_swap_type needs_swap;
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enum dso_binary_type symtab_type;
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@ -244,6 +244,12 @@ void dso__free_a2l(struct dso *dso __maybe_unused)
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#endif /* HAVE_LIBBFD_SUPPORT */
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/*
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* Number of addr2line failures (without success) before disabling it for that
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* dso.
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*/
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#define A2L_FAIL_LIMIT 123
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char *get_srcline(struct dso *dso, unsigned long addr)
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{
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char *file = NULL;
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@ -268,15 +274,21 @@ char *get_srcline(struct dso *dso, unsigned long addr)
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if (!addr2line(dso_name, addr, &file, &line, dso))
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goto out;
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if (asprintf(&srcline, "%s:%u", file, line) < 0)
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srcline = SRCLINE_UNKNOWN;
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if (asprintf(&srcline, "%s:%u", file, line) < 0) {
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free(file);
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goto out;
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}
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dso->a2l_fails = 0;
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free(file);
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return srcline;
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out:
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dso->has_srcline = 0;
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dso__free_a2l(dso);
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if (dso->a2l_fails && ++dso->a2l_fails > A2L_FAIL_LIMIT) {
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dso->has_srcline = 0;
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dso__free_a2l(dso);
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}
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return SRCLINE_UNKNOWN;
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}
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