These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / samples / bpf / tracex6_kern.c

diff --git a/kernel/samples/bpf/tracex6_kern.c b/kernel/samples/bpf/tracex6_kern.c
new file mode 100644 (file)
index 0000000..be479c4
--- /dev/null
+++ b/kernel/samples/bpf/tracex6_kern.c
@@ -0,0 +1,27 @@
+#include <linux/ptrace.h>
+#include <linux/version.h>
+#include <uapi/linux/bpf.h>
+#include "bpf_helpers.h"
+
+struct bpf_map_def SEC("maps") my_map = {
+       .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
+       .key_size = sizeof(int),
+       .value_size = sizeof(u32),
+       .max_entries = 32,
+};
+
+SEC("kprobe/sys_write")
+int bpf_prog1(struct pt_regs *ctx)
+{
+       u64 count;
+       u32 key = bpf_get_smp_processor_id();
+       char fmt[] = "CPU-%d   %llu\n";
+
+       count = bpf_perf_event_read(&my_map, key);
+       bpf_trace_printk(fmt, sizeof(fmt), key, count);
+
+       return 0;
+}
+
+char _license[] SEC("license") = "GPL";
+u32 _version SEC("version") = LINUX_VERSION_CODE;