Messages in this thread Patch in this message | | | Subject | [RFC PATCH perf/core 11/13] perf probe: Use cache entry if possible | From | Masami Hiramatsu <> | Date | Mon, 01 Jun 2015 00:11:45 +0900 |
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Before analyzing debuginfo, try to find a corresponding entry from probe cache always. This does not depend on --cache, the --cache enables to store/update cache, but looking up the cache is always enabled.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> --- tools/perf/util/probe-event.c | 58 +++++++++++++++++++++++++++++++++++++++++ tools/perf/util/probe-file.c | 20 +++++++++++++- tools/perf/util/probe-file.h | 5 +++- 3 files changed, 81 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index ea40d1da..00fe6e7 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -2489,6 +2489,59 @@ err_out: bool __weak arch__prefers_symtab(void) { return false; } +static int find_probe_trace_events_from_cache(struct perf_probe_event *pev, + struct probe_trace_event **tevs) +{ + struct probe_cache *cache; + struct probe_cache_entry *entry; + struct probe_trace_event *tev; + struct str_node *node; + int ret, i; + + cache = probe_cache__new(pev->target); + if (!cache) + return 0; + + entry = probe_cache__find(cache, pev); + + if (!entry && !pev->event && + (!pev->point.file && pev->point.function && !pev->point.retprobe && + !pev->point.line && !pev->point.offset && !pev->point.lazy_line)) { + entry = probe_cache__find_by_name(cache, pev->group, + pev->point.function); + } + if (!entry) { + ret = 0; + goto out; + } + + ret = strlist__nr_entries(entry->tevlist); + if (ret > probe_conf.max_probes) { + pr_debug("Too many entries matched in the cache of %s\n", + pev->target ? : "kernel"); + ret = -E2BIG; + goto out; + } + + *tevs = zalloc(ret * sizeof(*tev)); + if (!*tevs) { + ret = -ENOMEM; + goto out; + } + + i = 0; + strlist__for_each(node, entry->tevlist) { + ret = parse_probe_trace_command(node->s, &(*tevs)[i++]); + if (ret < 0) + goto out; + } + ret = i; + +out: + probe_cache__delete(cache); + return ret; +} + static int convert_to_probe_trace_events(struct perf_probe_event *pev, struct probe_trace_event **tevs) { @@ -2503,6 +2556,11 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev, } } + /* At first, we need to lookup cache entry */ + ret = find_probe_trace_events_from_cache(pev, tevs); + if (ret > 0) + return ret; /* Found in probe cache */ + if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) { ret = find_probe_trace_events_from_map(pev, tevs); if (ret > 0) diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c index 572e8c2..984f690 100644 --- a/tools/perf/util/probe-file.c +++ b/tools/perf/util/probe-file.c @@ -481,7 +481,7 @@ static bool streql(const char *a, const char *b) return !strcmp(a, b); } -static struct probe_cache_entry * +struct probe_cache_entry * probe_cache__find(struct probe_cache *pcache, struct perf_probe_event *pev) { struct probe_cache_entry *entry = NULL; @@ -506,6 +506,24 @@ found: return entry; } +struct probe_cache_entry * +probe_cache__find_by_name(struct probe_cache *pcache, + const char *group, const char *event) +{ + struct probe_cache_entry *entry = NULL; + + list_for_each_entry(entry, &pcache->list, list) { + /* Hit if same event name or same command-string */ + if (streql(entry->pev.group, group) && + streql(entry->pev.event, event)) + goto found; + } + entry = NULL; + +found: + return entry; +} + int probe_cache__add_entry(struct probe_cache *pcache, struct perf_probe_event *pev, struct probe_trace_event *tevs, int ntevs) diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h index 7b473b39..833e061 100644 --- a/tools/perf/util/probe-file.h +++ b/tools/perf/util/probe-file.h @@ -34,5 +34,8 @@ int probe_cache__add_entry(struct probe_cache *pcache, struct probe_trace_event *tevs, int ntevs); int probe_cache__commit(struct probe_cache *pcache); void probe_cache__delete(struct probe_cache *pcache); - +struct probe_cache_entry *probe_cache__find(struct probe_cache *pcache, + struct perf_probe_event *pev); +struct probe_cache_entry *probe_cache__find_by_name(struct probe_cache *pcache, + const char *group, const char *event); #endif
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