xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

perf/core: Implement the 'perf_uprobe' PMU

Browse Source 
This patch adds perf_uprobe support with similar pattern as previous
patch (for kprobe).

Two functions, create_local_trace_uprobe() and
destroy_local_trace_uprobe(), are created so a uprobe can be created
and attached to the file descriptor created by perf_event_open().

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Yonghong Song <yhs@fb.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Cc: <daniel@iogearbox.net>
Cc: <davem@davemloft.net>
Cc: <kernel-team@fb.com>
Cc: <rostedt@goodmis.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20171206224518.3598254-7-songliubraving@fb.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Song Liu
2017-12-06 14:45:16 -08:00
committed by Ingo Molnar
parent e12f03d703
commit 33ea4b2427
5 changed files with 186 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
kernel/events/core.c
View File

@@ -7992,7 +7992,7 @@ static struct pmu perf_tracepoint = {
.read = perf_swevent_read,
};
#ifdef CONFIG_KPROBE_EVENTS
#if defined(CONFIG_KPROBE_EVENTS) || defined(CONFIG_UPROBE_EVENTS)
/*
* Flags in config, used by dynamic PMU kprobe and uprobe
* The flags should match following PMU_FORMAT_ATTR().
@@ -8020,7 +8020,9 @@ static const struct attribute_group *probe_attr_groups[] = {
&probe_format_group,
NULL,
};
#endif
#ifdef CONFIG_KPROBE_EVENTS
static int perf_kprobe_event_init(struct perf_event *event);
static struct pmu perf_kprobe = {
.task_ctx_nr = perf_sw_context,
@@ -8057,12 +8059,52 @@ static int perf_kprobe_event_init(struct perf_event *event)
}
#endif /* CONFIG_KPROBE_EVENTS */
#ifdef CONFIG_UPROBE_EVENTS
static int perf_uprobe_event_init(struct perf_event *event);
static struct pmu perf_uprobe = {
.task_ctx_nr = perf_sw_context,
.event_init = perf_uprobe_event_init,
.add = perf_trace_add,
.del = perf_trace_del,
.start = perf_swevent_start,
.stop = perf_swevent_stop,
.read = perf_swevent_read,
.attr_groups = probe_attr_groups,
};
static int perf_uprobe_event_init(struct perf_event *event)
{
int err;
bool is_retprobe;
if (event->attr.type != perf_uprobe.type)
return -ENOENT;
/*
* no branch sampling for probe events
*/
if (has_branch_stack(event))
return -EOPNOTSUPP;
is_retprobe = event->attr.config & PERF_PROBE_CONFIG_IS_RETPROBE;
err = perf_uprobe_init(event, is_retprobe);
if (err)
return err;
event->destroy = perf_uprobe_destroy;
return 0;
}
#endif /* CONFIG_UPROBE_EVENTS */
static inline void perf_tp_register(void)
{
perf_pmu_register(&perf_tracepoint, "tracepoint", PERF_TYPE_TRACEPOINT);
#ifdef CONFIG_KPROBE_EVENTS
perf_pmu_register(&perf_kprobe, "kprobe", -1);
#endif
#ifdef CONFIG_UPROBE_EVENTS
perf_pmu_register(&perf_uprobe, "uprobe", -1);
#endif
}
static void perf_event_free_filter(struct perf_event *event)
@@ -8150,6 +8192,10 @@ static inline bool perf_event_is_tracing(struct perf_event *event)
#ifdef CONFIG_KPROBE_EVENTS
if (event->pmu == &perf_kprobe)
return true;
#endif
#ifdef CONFIG_UPROBE_EVENTS
if (event->pmu == &perf_uprobe)
return true;
#endif
return false;
}