tools: Add guest trace agent as a user tool
This patch adds a user tool, "trace agent" for sending trace data of a guest to
a Host in low overhead. This agent has the following functions:
- splice a page of ring-buffer to read_pipe without memory copying
- splice the page from write_pipe to virtio-console without memory copying
- write trace data to stdout by using -o option
- controlled by start/stop orders from a Host
Changes in v2:
- Cleanup (change fprintf() to pr_err() and an include guard)
Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/tools/virtio/virtio-trace/Makefile b/tools/virtio/virtio-trace/Makefile
new file mode 100644
index 0000000..ef3adfc
--- /dev/null
+++ b/tools/virtio/virtio-trace/Makefile
@@ -0,0 +1,14 @@
+CC = gcc
+CFLAGS = -O2 -Wall
+LFLAG = -lpthread
+
+all: trace-agent
+
+.c.o:
+ $(CC) $(CFLAGS) $(LFLAG) -c $^ -o $@
+
+trace-agent: trace-agent.o trace-agent-ctl.o trace-agent-rw.o
+ $(CC) $(CFLAGS) $(LFLAG) -o $@ $^
+
+clean:
+ rm -f *.o trace-agent