To: perfctr-devel@lists.sourceforge.net
Subject: perfctr-2.6.32 released

Version 2.6.32 of perfctr, the Linux performance monitoring
counters kernel extension, is now available at the usual
place: http://user.it.uu.se/~mikpe/linux/perfctr/2.6/

Version 2.6.32, 2008-04-20
- Library: add experimental vperfctr_open_mode(mode) procedure.
  The plain vperfctr_open() always opens the perfctr state in
  O_CREAT|O_EXCL mode, which means that it will fail if the
  invoking thread already has a perfctr state. The mode parameter
  to vperfctr_open_mode() can be used to avoid this behaviour:
  with mode == 0 no state will be created and a handle to the
  thread's existing state (if any) is returned; to select the
  current behaviour pass mode == VPERFCTR_OPEN_CREAT_EXCL to
  vperfctr_open_mode(). For example:

  the_state_is_shared = 0;
  vperfctr = vperfctr_open_mode(VPERFCTR_OPEN_CREAT_EXCL);
  if (vperfctr == NULL && errno == EEXIST) {
     // error out due to the resource conflict, or:
     vperfctr = vperfctr_open_mode(0);
     the_state_is_shared = 1;
  }
  ...

  The purpose of this API extension is to hopefully allow PAPI
  to handle some use cases that currently cause it to error out.
- Fix 'make install' to select the correct file to install
  as <asm/perfctr.h>. Fixes regression caused by i386/x86_64
  arch unification in perfctr-2.6.30. ppc32 also needed fixing.
- x86: Recognize Intel Family 6 Model 23 as Core2.
- Updated kernel support: 2.6.25, 2.6.18-53.1.14.el5 (RHEL5),
  2.6.9-67.0.7.EL (RHEL4).

/ Mikael Pettersson