Hi Felipe,
On Friday 09 June 2017 11:43 AM, Felipe Balbi wrote:
+static void notrace ftrace_write(struct trace_export *ftrace, const void *buf,
+ unsigned int len)
+{
+ struct usb_ftrace *trace = ftrace_to_trace(ftrace);
+ struct usb_request *req = next_request(&trace->list);
+
+ if (!req)
+ return;
+
+ if (!trace->in->enabled)
+ return;
+
+ req->buf = kmemdup(buf, len, GFP_ATOMIC);
Probably we can avoid the copy of trace data.
We can make write() call of "struct trace_export" as posted. Can have a
write_complete() callback function implemented in struct trace_export,which
can be called from your ftrace_complete().
We need to execute __buffer_unlock_commit() only in write_complete() in case
of ftrace_export is enabled.
+ req->length = len;
+ req->context = trace;
+ req->complete = ftrace_complete;
+ list_move_tail(&req->list, &trace->pending);
+
+ schedule_work(&trace->queue_work);
+}
+
--
Pratyush
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