Add the vm.exec_map_entries tunable and read-only sysctl, which controls the number of entries in exec_map (maximum number of simultaneous execs that can be handled by the kernel).  The default value of 16 is insufficient on heavily loaded machines (particularly SMP machines), and if it is exceeded then executing further processes will generate a SIGABRT.
Add the vm.exec_map_entries tunable and read-only sysctl, which controls
the number of entries in exec_map (maximum number of simultaneous execs
that can be handled by the kernel).  The default value of 16 is
insufficient on heavily loaded machines (particularly SMP machines), and
if it is exceeded then executing further processes will generate a SIGABRT.

This is a workaround until a better solution can be implemented.

Reviewed by:	alc
MFC after:	3 days

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