commit fd90bc8ba1ef8005f68d158b73bad1e76fbd5d2d
author Maciej Żenczykowski <maze@google.com> Mon Feb 10 19:27:47 2020 -0800
committer Maciej Żenczykowski <maze@google.com> Mon Feb 10 19:30:06 2020 -0800
tree b269f852af4c2691f1730c9bc9890b82267eb559
parent 2cc5aeb81673cb6aa936c4faa5f5248588f7258e

make getBpfSupportLevel() cached

Test: build, atest
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I6948934c88ce8268ad38e8c0061807a81f5ea4bb

libbpf_android/BpfUtils.cpp

diff --git a/libbpf_android/BpfUtils.cpp b/libbpf_android/BpfUtils.cpp
index 3fc7cc9..c175d98 100644
--- a/libbpf_android/BpfUtils.cpp
+++ b/libbpf_android/BpfUtils.cpp
@@ -106,7 +106,7 @@
     }
 }
 
-BpfLevel getBpfSupportLevel() {
+static BpfLevel getUncachedBpfSupportLevel() {
     struct utsname buf;
     int kernel_version_major;
     int kernel_version_minor;
@@ -135,5 +135,17 @@
     return BpfLevel::NONE;
 }
 
+BpfLevel getBpfSupportLevel() {
+    static bool initialized = false;
+    static BpfLevel cache;
+
+    if (!initialized) {
+        initialized = true;
+        cache = getUncachedBpfSupportLevel();
+    }
+
+    return cache;
+}
+
 }  // namespace bpf
 }  // namespace android