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Subject[RFC,PATCH 2/3] trace,perf: add support for registering ftrace/function tracepoint event via perf
Date
Added support to enable ftrace/function tracepoint via perf interface.

wbr,
jirka
---
kernel/trace/ftrace.c | 34 +++++++++++++++++++++++++++++++++-
1 files changed, 33 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 00fe267..49fbc8c 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3228,10 +3228,41 @@ ftrace_function_call_trace(unsigned long ip, unsigned long parent_ip)
local_irq_restore(flags);
}

+static void
+ftrace_function_call_perf(unsigned long ip, unsigned long parent_ip)
+{
+ struct ftrace_entry *entry;
+ struct hlist_head *head;
+ unsigned long flags;
+ int rctx;
+
+ local_irq_save(flags);
+
+ BUILD_BUG_ON(sizeof(*entry) > PERF_MAX_TRACE_SIZE);
+
+ entry = (struct ftrace_entry *) perf_trace_buf_prepare(sizeof(*entry),
+ TRACE_FN, NULL, &rctx);
+ if (!entry)
+ return;
+
+ entry->ip = ip;
+ entry->parent_ip = parent_ip;
+
+ head = this_cpu_ptr(event_function.perf_events);
+ perf_trace_buf_submit(entry, sizeof(*entry), rctx, 0,
+ 1, NULL, head);
+
+ local_irq_restore(flags);
+}
+
static struct ftrace_ops ftrace_trace_ops __read_mostly = {
.func = ftrace_function_call_trace,
};

+static struct ftrace_ops ftrace_perf_ops __read_mostly = {
+ .func = ftrace_function_call_perf,
+};
+
int ftrace_event_class_register(struct ftrace_event_call *call,
enum trace_reg type)
{
@@ -3246,8 +3277,9 @@ int ftrace_event_class_register(struct ftrace_event_call *call,
case TRACE_REG_UNREGISTER:
return unregister_ftrace_function(&ftrace_trace_ops);
case TRACE_REG_PERF_REGISTER:
+ return register_ftrace_function(&ftrace_perf_ops);
case TRACE_REG_PERF_UNREGISTER:
- break;
+ return unregister_ftrace_function(&ftrace_perf_ops);
}

return -EINVAL;
--
1.7.1


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