Reorg headers and only print unexpected errno's

ServerBench.cpp

@@ -6,8 +6,10 @@
 #include <string.h>
 #include <string>
 #include <string_view>
+#include <sys/ioctl.h>
 #include <sys/resource.h>
 #include <sys/socket.h>
+#include <sys/types.h>
 #include <sys/uio.h>
 #include <thread>
 #include <unistd.h>
@@ -166,16 +168,8 @@ double toSeconds(timeval t) {
   return double(t.tv_sec) + double(t.tv_usec) * 1e-6;
 }
 
-#include <linux/perf_event.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/ioctl.h>
-#include <sys/syscall.h>
-#include <sys/types.h>
-#include <unistd.h>
-
 #ifdef __linux__
+#include <linux/perf_event.h>
 struct PerfCounter {
   PerfCounter(int type, int config, const std::string &labels = {})
       : labels(labels) {
@@ -190,6 +184,9 @@ struct PerfCounter {
     pe.exclude_hv = 1;
 
     fd = perf_event_open(&pe, 0, -1, -1, 0);
+    if (fd < 0 && errno != ENOENT && errno != EINVAL) {
+      perror(labels.c_str());
+    }
   }
 
   int64_t total() const {
@@ -278,7 +275,6 @@ int main(int argc, char **argv) {
           cacheCounters.emplace_back(PERF_TYPE_HW_CACHE,
                                      id | (op << 8) | (result << 16), labels);
           if (!cacheCounters.back().ok()) {
-            fprintf(stderr, "Could not open cache event: %s\n", labels.c_str());
             cacheCounters.pop_back();
           }
         }