Linux-kernel mailing list archive 1999-23,: release 0.2 of x86 performance-monitoring counters support patch

# release 0.2 of x86 performance-monitoring counters support patch

Mikael Pettersson (mikpe@csd.uu.se)
Mon, 7 Jun 1999 03:17:12 +0200 (MET DST)

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I've updated my x86 performance-monitoring counters patch.
The current patch is against kernel 2.3.5.
Summary follows:

* Version 0.2 1999-06-07
* - Added support for WinChip CPUs.
* - Restart counters from zero, not their previous values. This
* corrected a problem for Intel P6 (WRMSR writes 32 bits to a PERFCTR
* MSR and then sign-extends to 40 bits), and also simplified the code.
* - Added support for syncing the kernel's counter values to a user-
* provided buffer each time a process is resumed. This feature, and
* the fact that the driver enables RDPMC in processes using PMCs,
* allows user-level computation of a process' accumulated counter
* values without incurring the overhead of making a system call.
* Version 0.1 1999-05-30
* - First public release.

The latest version of this package can be downloaded from
http://www.csd.uu.se/~mikpe/linux/

/ Mikael Pettersson

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