rocx

@burnettzhong you can create a soft link for python2 like this: `ln -s /usr/bin/python python2`

还有这种操作。。

try this: [fix crash](https://github.com/QafooLabs/php-profiler-extension/commit/16b3ae28b2558f99461325db4c4d3032db9e3746)

`kernel: php-fpm[51660]: segfault at 18 ip 00007f80e6f1c24f sp 00007fff264638e0 error 4 in xhprof.so[7f80e6f18000+6000]` try this: [fix crash](https://github.com/QafooLabs/php-profiler-extension/commit/16b3ae28b2558f99461325db4c4d3032db9e3746)

可否详细说下使用过程中遇到的坑？