[Xen-devel] PATCH: provide hooks for perfc print/reset/gather

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Hi,

I'd like to use the perfc API to report counters not easily countable (such as 
the number of valid entries in a table.  Counting it on the fly may be very 
costly).
These hooks provide the basic infrastructure for that.

(empty hooks added for ia64 and powerpc, x86 hooks call ptwr_eip_stat_XX).

Tristan.

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