Hi,
The following patches add trace support in kvm using relay_fs
and trace_mark according to last comments. if we want to use it, we
should config kvm_trace firstly which depends on MARKERS and SYSFS, at
this case it will add a tiny time penalty to check whether we provide a
hook to call a function. if we don't config MARKERS, the trace functions
are void. I refer to the blktrace code to implement it. Welcome
comments.
--Eric (Liu, Feng)
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