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perf top: Exit if specified --vmlinux can't be used

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As we do lazy loading of symtabs we only will know if the
specified vmlinux file is invalid when we actually have a hit in
kernel space and then try to load it. So if we get kernel hits
and there are _no_ symbols in the DSO backing the kernel map,
bail out.

Reported-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1264633557-17597-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo 2010-01-27 21:05:49 -02:00 committed by Ingo Molnar
parent 75c9f3284a
commit 72b8fa1730
1 changed files with 23 additions and 1 deletions
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24
tools/perf/builtin-top.c
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@ -951,9 +951,31 @@ static void event__process_sample(const event_t *self,
}
if (event__preprocess_sample(self, session, &al, symbol_filter) < 0 ||
al.sym == NULL || al.filtered)
al.filtered)
return;
if (al.sym == NULL) {
/*
* As we do lazy loading of symtabs we only will know if the
* specified vmlinux file is invalid when we actually have a
* hit in kernel space and then try to load it. So if we get
* here and there are _no_ symbols in the DSO backing the
* kernel map, bail out.
*
* We may never get here, for instance, if we use -K/
* --hide-kernel-symbols, even if the user specifies an
* invalid --vmlinux ;-)
*/
if (al.map == session->vmlinux_maps[MAP__FUNCTION] &&
RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
pr_err("The %s file can't be used\n",
symbol_conf.vmlinux_name);
exit(1);
}
return;
}
syme = symbol__priv(al.sym);
if (!syme->skip) {
syme->count[counter]++;