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perf probe: Add --max-probes option

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Add --max-probes option to change the maximum limit of
findable probe points per event, since inlined function can be
expanded into thousands of probe points. Default value is 128.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Suggested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
LKML-Reference: <20100421195640.24664.62984.stgit@localhost6.localdomain6>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu
2010-04-21 15:56:40 -04:00
committed by Arnaldo Carvalho de Melo
parent 5d1ee0413c
commit ef4a356574
6 changed files with 33 additions and 17 deletions
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17
tools/perf/util/probe-event.c
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@@ -150,7 +150,8 @@ static int convert_to_perf_probe_point(struct kprobe_trace_point *tp,
/* Try to find perf_probe_event with debuginfo */
static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
struct kprobe_trace_event **tevs)
struct kprobe_trace_event **tevs,
int max_tevs)
{
bool need_dwarf = perf_probe_event_need_dwarf(pev);
int fd, ntevs;
@@ -166,7 +167,7 @@ static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
}
/* Searching trace events corresponding to probe event */
ntevs = find_kprobe_trace_events(fd, pev, tevs);
ntevs = find_kprobe_trace_events(fd, pev, tevs, max_tevs);
close(fd);
if (ntevs > 0) { /* Succeeded to find trace events */
@@ -318,7 +319,8 @@ static int convert_to_perf_probe_point(struct kprobe_trace_point *tp,
}
static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
struct kprobe_trace_event **tevs __unused)
struct kprobe_trace_event **tevs __unused,
int max_tevs __unused)
{
if (perf_probe_event_need_dwarf(pev)) {
pr_warning("Debuginfo-analysis is not supported.\n");
@@ -1408,14 +1410,15 @@ static int __add_kprobe_trace_events(struct perf_probe_event *pev,
}
static int convert_to_kprobe_trace_events(struct perf_probe_event *pev,
struct kprobe_trace_event **tevs)
struct kprobe_trace_event **tevs,
int max_tevs)
{
struct symbol *sym;
int ret = 0, i;
struct kprobe_trace_event *tev;
/* Convert perf_probe_event with debuginfo */
ret = try_to_find_kprobe_trace_events(pev, tevs);
ret = try_to_find_kprobe_trace_events(pev, tevs, max_tevs);
if (ret != 0)
return ret;
@@ -1487,7 +1490,7 @@ struct __event_package {
};
int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
bool force_add)
bool force_add, int max_tevs)
{
int i, j, ret;
struct __event_package *pkgs;
@@ -1506,7 +1509,7 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
pkgs[i].pev = &pevs[i];
/* Convert with or without debuginfo */
ret = convert_to_kprobe_trace_events(pkgs[i].pev,
&pkgs[i].tevs);
&pkgs[i].tevs, max_tevs);
if (ret < 0)
goto end;
pkgs[i].ntevs = ret;