Add TRACE_BPF as a new trace type to establish infrastruction for bpf
output data to perf. This new trace type creates a static singleton
ftrace entry in kernel, userspace perf tools can detect and use this
new ftrace entry just as using the existing tracepoint events.
This added a new bpf ftrace entry in debugfs:
/sys/kernel/debug/tracing/events/ftrace/bpf
Userspace perf tools detect the new tracepoint event as:
ftrace:bpf [Tracepoint event]
Data in ring-buffer of perf events added to this ftrace:bpf event can
be polled out, sample types and other attributes can be adjusted to
those events directly without touching the original kprobe events.
Signed-off-by: He Kuang <heku...@huawei.com>
---
kernel/trace/trace.h | 1 +
kernel/trace/trace_entries.h | 18 ++++++++++++++++++
2 files changed, 19 insertions(+)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index d261201..d135f55 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -38,6 +38,7 @@ enum trace_type {
TRACE_USER_STACK,
TRACE_BLK,
TRACE_BPUTS,
+ TRACE_BPF,
__TRACE_LAST_TYPE,
};
diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index ee7b94a..c237212 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -322,3 +322,21 @@ FTRACE_ENTRY(branch, trace_branch,
FILTER_OTHER
);
+#define TRACE_BPF_MAX_ENTRY 64
+#define TRACE_BPF_MAX_SIZE (TRACE_BPF_MAX_ENTRY * sizeof(u64))
+
+FTRACE_ENTRY_REG(bpf, trace_bpf,
+
+ TRACE_BPF,
+
+ F_STRUCT(
+ __field(long, size)
+ __array(u64, raw_data, TRACE_BPF_MAX_ENTRY)
+ ),
+
+ F_printk("%ld: (%016llx, ...)", __entry->size, __entry->raw_data[0]),
+
+ FILTER_OTHER,
+
+ perf_ftrace_event_register
+);
--
1.8.5.2
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