MySQL Bugs: #71895: Documentation about the PSI interface

Bug #71895	Documentation about the PSI interface
Submitted:	1 Mar 2014 11:50	Modified:	1 Mar 2014 12:11
Reporter:	Daniël van Eeden (OCA)	Email Updates:
Status:	Open	Impact on me:	None
Category:	MySQL Server: Documentation	Severity:	S4 (Feature request)
Version:	5.6.16	OS:	Any
Assigned to:		CPU Architecture:	Any
Tags:	P_S, performance_schema, PFS, PSI

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Description:
It looks like there is no documentation about how to add performance instrumentation to a plugin. After browsing trough the sourcecode it looks like one has to use the PSI interface which is used by performance_schema.

How to repeat:
Search docs for things like HAVE_PSI_INTERFACE

The PSI interface is used in storage/example/ha_example.cc

But the PSI interface is not explained in ha_example.cc or on https://dev.mysql.com/doc/internals/en/custom-engine.html