]> err.no Git - linux-2.6/commit
[PATCH] x86: Add performance counter reservation framework for UP kernels
authorDon Zickus <dzickus@redhat.com>
Tue, 26 Sep 2006 08:52:26 +0000 (10:52 +0200)
committerAndi Kleen <andi@basil.nowhere.org>
Tue, 26 Sep 2006 08:52:26 +0000 (10:52 +0200)
commit828f0afda123a96ff4e8078f057a302f4b4232ae
treea6f7398e0037f5c8f4cbd95ff11c5e4bf78a4c4d
parentb07f8915cda3fcd73b8b68075ba1e6cd0673365d
[PATCH] x86: Add performance counter reservation framework for UP kernels

Adds basic infrastructure to allow subsystems to reserve performance
counters on the x86 chips.  Only UP kernels are supported in this patch to
make reviewing easier.  The SMP portion makes a lot more changes.

Think of this as a locking mechanism where each bit represents a different
counter.  In addition, each subsystem should also reserve an appropriate
event selection register that will correspond to the performance counter it
will be using (this is mainly neccessary for the Pentium 4 chips as they
break the 1:1 relationship to performance counters).

This will help prevent subsystems like oprofile from interfering with the
nmi watchdog.

Signed-off-by: Don Zickus <dzickus@redhat.com>
Signed-off-by: Andi Kleen <ak@suse.de>
arch/i386/kernel/nmi.c
arch/x86_64/kernel/nmi.c
include/asm-i386/nmi.h
include/asm-x86_64/nmi.h