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IOCLASSCOUNT(8) BSD System Manager's Manual IOCLASSCOUNT(8)
NAME
ioclasscount
SYNOPSIS
ioclasscount [classname] [...]
DESCRIPTION
ioclasscount displays the instance counts of OSObject-based C++ classes in the kernel, incremented by
the number of direct subclasses that have an instance count of at least 1. For example, if IONetwork-Controller IONetworkController
Controller is not directly instantiated, but its direct subclass IOEthernetController has any
instances, then IONetworkController's instance count will be at least 1; if another direct subclass
such as IOFWController has any instances, then IONetworkController's instance count will be at least 2;
and so on. (This modification of instance counts prevents unloading of kexts defining superclasses
that have no instances, but whose subclasses in other kexts have instances.)
If classes are specified, instance counts are printed as a comma-separated list in the order specified.
If no classes are specified, instance counts for all classes are printed, one per line of output and
sorted by name.
This information is useful for tracking leaks. Instance counts can also found in the root of the
IORegistry in the ``IOKitDiagnostics'' property.
EXAMPLES
Display instance counts for IOPCIDevice and AppleTestPCI:
/usr/sbin/ioclasscount IOPCIDevice AppleTestPCI
IOPCIDevice = 2, AppleTestPCI = 1
SEE ALSO
ioalloccount(8), ioreg(8)
Darwin November 06, 2008 Darwin
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