Version 1.8 of x86 performance counters driver

Version 1.8 of my x86 performance-monitoring counters driver is now available at http://www.csd.uu.se/~mikpe/linux/perfctr/.

Summary:
Version 1.8, 2001-01-23
- Added preliminary interrupt-mode support to virtual perfctrs. Currently for P6 only, and the local APIC must have been enabled. Tested on 2.4.0-ac10 with CONFIG_X86_UP_APIC=y.
When an i-mode vperfctr interrupts on overflow, the counters are suspended and a user-specified signal is sent to the process. The user's signal handler can read the trap pc from the mmap:ed vperfctr, and should then issue an IRESUME ioctl to restart the counters. The next version will support buffering and automatic restart.

/ Mikael Pettersson
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