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trace_uprobe: support reference counter in fd-based uprobe

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This patch enables uprobes with reference counter in fd-based uprobe.
Highest 32 bits of perf_event_attr.config is used to stored offset
of the reference count (semaphore).

Format information in /sys/bus/event_source/devices/uprobe/format/ is
updated to reflect this new feature.

Link: http://lkml.kernel.org/r/20181002053636.1896903-1-songliubraving@fb.com

Cc: Oleg Nesterov <oleg@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-and-tested-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Song Liu
2018-10-01 22:36:36 -07:00
committed by Steven Rostedt (VMware)
parent 5a5e3d3cea
commit a6ca88b241
5 changed files with 50 additions and 16 deletions
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7
kernel/trace/trace_event_perf.c
View File

@@ -290,7 +290,8 @@ void perf_kprobe_destroy(struct perf_event *p_event)
#endif /* CONFIG_KPROBE_EVENTS */
#ifdef CONFIG_UPROBE_EVENTS
int perf_uprobe_init(struct perf_event *p_event, bool is_retprobe)
int perf_uprobe_init(struct perf_event *p_event,
unsigned long ref_ctr_offset, bool is_retprobe)
{
int ret;
char *path = NULL;
@@ -312,8 +313,8 @@ int perf_uprobe_init(struct perf_event *p_event, bool is_retprobe)
goto out;
}
tp_event = create_local_trace_uprobe(
path, p_event->attr.probe_offset, is_retprobe);
tp_event = create_local_trace_uprobe(path, p_event->attr.probe_offset,
ref_ctr_offset, is_retprobe);
if (IS_ERR(tp_event)) {
ret = PTR_ERR(tp_event);
goto out;

3
kernel/trace/trace_probe.h
View File

@@ -412,6 +412,7 @@ create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
extern void destroy_local_trace_kprobe(struct trace_event_call *event_call);
extern struct trace_event_call *
create_local_trace_uprobe(char *name, unsigned long offs, bool is_return);
create_local_trace_uprobe(char *name, unsigned long offs,
unsigned long ref_ctr_offset, bool is_return);
extern void destroy_local_trace_uprobe(struct trace_event_call *event_call);
#endif

4
kernel/trace/trace_uprobe.c
View File

@@ -1405,7 +1405,8 @@ static int unregister_uprobe_event(struct trace_uprobe *tu)
#ifdef CONFIG_PERF_EVENTS
struct trace_event_call *
create_local_trace_uprobe(char *name, unsigned long offs, bool is_return)
create_local_trace_uprobe(char *name, unsigned long offs,
unsigned long ref_ctr_offset, bool is_return)
{
struct trace_uprobe *tu;
struct path path;
@@ -1437,6 +1438,7 @@ create_local_trace_uprobe(char *name, unsigned long offs, bool is_return)
tu->offset = offs;
tu->path = path;
tu->ref_ctr_offset = ref_ctr_offset;
tu->filename = kstrdup(name, GFP_KERNEL);
init_trace_event_call(tu, &tu->tp.call);