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[Yasufumi Kinoshita <yasufumi.kinoshita@xxxxxxxxxxx>]

I think both of Stability and Performance...

1. mutex_enter() from recursive function.
   the previous version have possibility to try to obtain twice the same mutex.
   (and may cause hangup or instant stall)

2. use correct mutex for zip pages.
   the previous version tries to use wrong mutex for zip pages at buf_page_get_gen()
   (block->mutex is not exist for the pages)

-- 
XtraDB with split-buffer patch has worse results than without
https://bugs.launchpad.net/bugs/310658
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Status in Percona XtraDB Storage Engine for MySQL: Fix Committed

Bug description:
please investigate why