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jyang authored
Check in code change for implementing Performace Schema in InnoDB. Objects in four different modules in InnoDB have been performance instrumented, these modules are: 1) mutexes 2) rwlocks 3) file I/O 4) threads We mostly preserved the existing APIs, but APIs would point to instrumented function wrappers if performance schema is defined. There are 4 different defines that controls the instrumentation of each module. The feature is off by default, and will be compiled in with special build option, and requre configure option to turn it on when server boots. For more detail design and functional information, please refer to performance schema wiki page. rb://270 approved by Marko Mäkelä
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