Merge pull request #51 from iovisor/marcol_dev

Update readme and FAQs

FAQ.txt

@@ -14,3 +14,17 @@ Q: hello_world.py still fails with:
    bpf: Operation not permitted
    Exception: Failed to load BPF program hello
 A: sudo
+
+Q: How do I fulfill the Linux kernel version requirement?
+A: You need to obtain a recent version of the Linux source code
+   (please look at the README for the exact version), enable the
+   configuration options listed in the README file, install the image,
+   modules and headers, update your bootloader and reboot into the new
+   kernel.
+
+   If you want to compile your own kernel, you can fetch the sources
+   from kernel.org or through your Linux distribution.
+   To install, you need all of the following:
+      make install
+      make modules_install
+      make headers_install INSTALL_HDR_PATH=/usr/local/

README.md

@@ -43,6 +43,7 @@ To get started using this toolchain, one needs:
   * `CONFIG_BPF_JIT=y`
   * `CONFIG_HAVE_BPF_JIT=y`
   * `CONFIG_BPF_EVENTS=y` [optional, for kprobes]
+* Linux kernel headers, 4.1 or newer
 * LLVM 3.7 or newer, compiled with BPF support (default=on)
 * Clang 3.7, built from the same tree as LLVM
 * pyroute2, version X.X (currently master, tag TBD) or newer