Merge pull request #53 from iovisor/yhs_dev

Yhs dev

FAQ.txt

@@ -10,6 +10,12 @@ A: make sure to 'make install' and add the directory
    where libbpfprog.so was installed into your LD_LIBRARY_PATH
    export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
 
+Q: hello_world.py fails with:
+   ImportError: No module named bpf
+A: checkout "sudo make install" output to find out bpf package installation site,
+   add it to the PYTHONPATH env variable before running the program.
+   sudo bash -c 'PYTHONPATH=/usr/lib/python2.7/site-packages python examples/hello_world.py'
+
 Q: hello_world.py still fails with:
    bpf: Operation not permitted
    Exception: Failed to load BPF program hello

README.md

@@ -67,7 +67,7 @@ cd bcc; mkdir build; cd build
 cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_PREFIX_PATH=/opt/local/llvm
 make -j$(grep -c ^processor /proc/cpuinfo)
 sudo make install
-cd ../../
+cd ../
 sudo python examples/hello_world.py
 <ctrl-C>
 ```