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perf symbols: Avoid unnecessary symbol loading when dso list is specified 

We were performing the full thread__find_addr_location
operation, i.e. resolving to a map/dso _and_ loading its symbols
when we can optimize it by first calling thread__find_addr_map
to find just the map/dso, check if it is one that we are
interested in (passed via --dsos/-d in 'perf annotate', 'perf
report', etc) and if not avoid loading the symtab.

Nice speedup when we know which DSO we're interested in.

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: <1269459619-982-2-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo 2010-03-24 16:40:15 -03:00 committed by Ingo Molnar
parent 53c5401957
commit 96415e4d3f
1 changed files with 22 additions and 14 deletions
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36
tools/perf/util/event.c
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@ -513,24 +513,32 @@ int event__preprocess_sample(const event_t *self, struct perf_session *session,
dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
thread__find_addr_location(thread, session, cpumode, MAP__FUNCTION,
self->ip.ip, al, filter);
thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
self->ip.ip, al);
dump_printf(" ...... dso: %s\n",
al->map ? al->map->dso->long_name :
al->level == 'H' ? "[hypervisor]" : "<not found>");
/*
* We have to do this here as we may have a dso with no symbol hit that
* has a name longer than the ones with symbols sampled.
*/
if (al->map && !sort_dso.elide && !al->map->dso->slen_calculated)
dso__calc_col_width(al->map->dso);
al->sym = NULL;
if (symbol_conf.dso_list &&
(!al->map || !al->map->dso ||
!(strlist__has_entry(symbol_conf.dso_list, al->map->dso->short_name) ||
(al->map->dso->short_name != al->map->dso->long_name &&
strlist__has_entry(symbol_conf.dso_list, al->map->dso->long_name)))))
goto out_filtered;
if (al->map) {
if (symbol_conf.dso_list &&
(!al->map || !al->map->dso ||
!(strlist__has_entry(symbol_conf.dso_list,
al->map->dso->short_name) ||
(al->map->dso->short_name != al->map->dso->long_name &&
strlist__has_entry(symbol_conf.dso_list,
al->map->dso->long_name)))))
goto out_filtered;
/*
* We have to do this here as we may have a dso with no symbol
* hit that has a name longer than the ones with symbols
* sampled.
*/
if (!sort_dso.elide && !al->map->dso->slen_calculated)
dso__calc_col_width(al->map->dso);
al->sym = map__find_symbol(al->map, al->addr, filter);
}
if (symbol_conf.sym_list && al->sym &&
!strlist__has_entry(symbol_conf.sym_list, al->sym->name))