add sample reports

Signed-off-by: David Wang <00107082@163.com>

Add example for perf pagefault

Signed-off-by: David Wang <00107082@163.com>

Add example for using perf comm

Signed-off-by: David Wang <00107082@163.com>

Add examples for using perf context switch

Signed-off-by: David Wang <00107082@163.com>

Add static link flags for building profiler

Signed-off-by: David Wang <00107082@163.com>

Do not profile the pid when pid belongs to root cgroup

Signed-off-by: David Wang <00107082@163.com>

Update: the profiler works on kernel 3.10.x

Signed-off-by: David Wang <00107082@163.com>

Update readme for profiler

1. compiler need to support c++11
2. Add how it works section

Signed-off-by: David Wang <00107082@163.com>

Add light weight profiler source code

Initial commit