Disable custom perf output support in older kernels

Signed-off-by: Brenden Blanco <[email protected]>
e-dant · Nov 6, 2015 · 1d75282 · 1d75282
1 parent aeca6bf
commit 1d75282
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/cc/libbpf.c b/src/cc/libbpf.c
@@ -293,6 +293,7 @@ int bpf_detach_kprobe(const char *event_desc) {
 }
 
 void * bpf_open_perf_buffer(perf_reader_raw_cb raw_cb, void *cb_cookie, int pid, int cpu) {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,4,0)
  int pfd;
  struct perf_event_attr attr = {};
  struct perf_reader *reader = NULL;
@@ -328,4 +329,8 @@ void * bpf_open_perf_buffer(perf_reader_raw_cb raw_cb, void *cb_cookie, int pid,
  perf_reader_free(reader);
 
  return NULL;
+#else
+ fprintf(stderr, "PERF_COUNT_SW_BPF_OUTPUT feature unsupported\n");
+ return NULL;
+#endif
 }