diff -rupN linux-2.6.14/CREDITS linux-2.6.14.perfctr27/CREDITS
--- linux-2.6.14/CREDITS	2005-10-28 11:24:05.000000000 +0200
+++ linux-2.6.14.perfctr27/CREDITS	2005-11-08 01:40:51.000000000 +0100
@@ -2629,6 +2629,7 @@ N: Mikael Pettersson
 E: mikpe@csd.uu.se
 W: http://www.csd.uu.se/~mikpe/
 D: Miscellaneous fixes
+D: Performance-monitoring counters driver
 
 N: Reed H. Petty
 E: rhp@draper.net
diff -rupN linux-2.6.14/MAINTAINERS linux-2.6.14.perfctr27/MAINTAINERS
--- linux-2.6.14/MAINTAINERS	2005-10-28 11:24:05.000000000 +0200
+++ linux-2.6.14.perfctr27/MAINTAINERS	2005-11-08 01:40:51.000000000 +0100
@@ -1923,6 +1923,12 @@ M:	tsbogend@alpha.franken.de
 L:	netdev@vger.kernel.org
 S:	Maintained
 
+PERFORMANCE-MONITORING COUNTERS DRIVER
+P:	Mikael Pettersson
+M:	mikpe@csd.uu.se
+W:	http://www.csd.uu.se/~mikpe/linux/perfctr/
+S:	Maintained
+
 PHRAM MTD DRIVER
 P:	Jörn Engel
 M:	joern@wh.fh-wedel.de
diff -rupN linux-2.6.14/arch/i386/Kconfig linux-2.6.14.perfctr27/arch/i386/Kconfig
--- linux-2.6.14/arch/i386/Kconfig	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/i386/Kconfig	2005-11-08 01:40:51.000000000 +0100
@@ -982,6 +982,9 @@ config CRASH_DUMP
 	depends on HIGHMEM
 	help
 	  Generate crash dump after being started by kexec.
+
+source "drivers/perfctr/Kconfig"
+
 endmenu
 
 
diff -rupN linux-2.6.14/arch/i386/kernel/entry.S linux-2.6.14.perfctr27/arch/i386/kernel/entry.S
--- linux-2.6.14/arch/i386/kernel/entry.S	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/i386/kernel/entry.S	2005-11-08 01:40:51.000000000 +0100
@@ -430,6 +430,16 @@ ENTRY(name)				\
 /* The include is where all of the SMP etc. interrupts come from */
 #include "entry_arch.h"
 
+#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_PERFCTR)
+ENTRY(perfctr_interrupt)
+	pushl $LOCAL_PERFCTR_VECTOR-256
+	SAVE_ALL
+	pushl %esp
+	call smp_perfctr_interrupt
+	addl $4, %esp
+	jmp ret_from_intr
+#endif
+
 ENTRY(divide_error)
 	pushl $0			# no error code
 	pushl $do_divide_error
diff -rupN linux-2.6.14/arch/i386/kernel/i8259.c linux-2.6.14.perfctr27/arch/i386/kernel/i8259.c
--- linux-2.6.14/arch/i386/kernel/i8259.c	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/i386/kernel/i8259.c	2005-11-08 01:40:51.000000000 +0100
@@ -23,6 +23,7 @@
 #include <asm/apic.h>
 #include <asm/arch_hooks.h>
 #include <asm/i8259.h>
+#include <asm/perfctr.h>
 
 #include <io_ports.h>
 
@@ -421,6 +422,8 @@ void __init init_IRQ(void)
 	 */
 	intr_init_hook();
 
+	perfctr_vector_init();
+
 	/*
 	 * Set the clock to HZ Hz, we already have a valid
 	 * vector now:
diff -rupN linux-2.6.14/arch/i386/kernel/process.c linux-2.6.14.perfctr27/arch/i386/kernel/process.c
--- linux-2.6.14/arch/i386/kernel/process.c	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/i386/kernel/process.c	2005-11-08 01:40:51.000000000 +0100
@@ -33,6 +33,7 @@
 #include <linux/delay.h>
 #include <linux/reboot.h>
 #include <linux/init.h>
+#include <linux/perfctr.h>
 #include <linux/mc146818rtc.h>
 #include <linux/module.h>
 #include <linux/kallsyms.h>
@@ -393,6 +394,7 @@ void exit_thread(void)
 		tss->io_bitmap_base = INVALID_IO_BITMAP_OFFSET;
 		put_cpu();
 	}
+	perfctr_exit_thread(&tsk->thread);
 }
 
 void flush_thread(void)
@@ -472,6 +474,8 @@ int copy_thread(int nr, unsigned long cl
 	savesegment(fs,p->thread.fs);
 	savesegment(gs,p->thread.gs);
 
+	perfctr_copy_task(p, regs);
+
 	tsk = current;
 	if (unlikely(NULL != tsk->thread.io_bitmap_ptr)) {
 		p->thread.io_bitmap_ptr = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
@@ -733,6 +737,7 @@ struct task_struct fastcall * __switch_t
 
 	disable_tsc(prev_p, next_p);
 
+	perfctr_resume_thread(next);
 	return prev_p;
 }
 
diff -rupN linux-2.6.14/arch/i386/kernel/syscall_table.S linux-2.6.14.perfctr27/arch/i386/kernel/syscall_table.S
--- linux-2.6.14/arch/i386/kernel/syscall_table.S	2005-08-29 14:34:27.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/i386/kernel/syscall_table.S	2005-11-08 01:40:51.000000000 +0100
@@ -294,3 +294,9 @@ ENTRY(sys_call_table)
 	.long sys_inotify_init
 	.long sys_inotify_add_watch
 	.long sys_inotify_rm_watch
+	.long sys_ni_syscall
+	.long sys_ni_syscall		/* 295 */
+	.long sys_vperfctr_open
+	.long sys_vperfctr_control
+	.long sys_vperfctr_write
+	.long sys_vperfctr_read
diff -rupN linux-2.6.14/arch/ppc/Kconfig linux-2.6.14.perfctr27/arch/ppc/Kconfig
--- linux-2.6.14/arch/ppc/Kconfig	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/ppc/Kconfig	2005-11-08 01:40:51.000000000 +0100
@@ -288,6 +288,8 @@ config NOT_COHERENT_CACHE
 	depends on 4xx || 8xx || E200
 	default y
 
+source "drivers/perfctr/Kconfig"
+
 endmenu
 
 menu "Platform options"
diff -rupN linux-2.6.14/arch/ppc/kernel/head.S linux-2.6.14.perfctr27/arch/ppc/kernel/head.S
--- linux-2.6.14/arch/ppc/kernel/head.S	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/ppc/kernel/head.S	2005-11-08 01:40:51.000000000 +0100
@@ -502,7 +502,11 @@ SystemCall:
 Trap_0f:
 	EXCEPTION_PROLOG
 	addi	r3,r1,STACK_FRAME_OVERHEAD
+#ifdef CONFIG_PERFCTR_INTERRUPT_SUPPORT
+	EXC_XFER_EE(0xf00, do_perfctr_interrupt)
+#else
 	EXC_XFER_EE(0xf00, UnknownException)
+#endif
 
 /*
  * Handle TLB miss for instruction on 603/603e.
diff -rupN linux-2.6.14/arch/ppc/kernel/misc.S linux-2.6.14.perfctr27/arch/ppc/kernel/misc.S
--- linux-2.6.14/arch/ppc/kernel/misc.S	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/ppc/kernel/misc.S	2005-11-08 01:40:51.000000000 +0100
@@ -1455,3 +1455,9 @@ _GLOBAL(sys_call_table)
 	.long sys_inotify_init		/* 275 */
 	.long sys_inotify_add_watch
 	.long sys_inotify_rm_watch
+	.long sys_ni_syscall
+	.long sys_ni_syscall
+	.long sys_vperfctr_open		/* 280 */
+	.long sys_vperfctr_control
+	.long sys_vperfctr_write
+	.long sys_vperfctr_read
diff -rupN linux-2.6.14/arch/ppc/kernel/process.c linux-2.6.14.perfctr27/arch/ppc/kernel/process.c
--- linux-2.6.14/arch/ppc/kernel/process.c	2005-03-02 19:24:14.000000000 +0100
+++ linux-2.6.14.perfctr27/arch/ppc/kernel/process.c	2005-11-08 01:40:51.000000000 +0100
@@ -35,6 +35,7 @@
 #include <linux/init_task.h>
 #include <linux/module.h>
 #include <linux/kallsyms.h>
+#include <linux/perfctr.h>
 #include <linux/mqueue.h>
 #include <linux/hardirq.h>
 
@@ -301,7 +302,9 @@ struct task_struct *__switch_to(struct t
 #endif /* CONFIG_SPE */
 	new_thread = &new->thread;
 	old_thread = &current->thread;
+	perfctr_suspend_thread(&prev->thread);
 	last = _switch(old_thread, new_thread);
+	perfctr_resume_thread(&current->thread);
 	local_irq_restore(s);
 	return last;
 }
@@ -363,6 +366,7 @@ void exit_thread(void)
 	if (last_task_used_spe == current)
 		last_task_used_spe = NULL;
 #endif
+	perfctr_exit_thread(&current->thread);
 }
 
 void flush_thread(void)
@@ -455,6 +459,8 @@ copy_thread(int nr, unsigned long clone_
 
 	p->thread.last_syscall = -1;
 
+	perfctr_copy_task(p, regs);
+
 	return 0;
 }
 
diff -rupN linux-2.6.14/arch/ppc64/Kconfig linux-2.6.14.perfctr27/arch/ppc64/Kconfig
--- linux-2.6.14/arch/ppc64/Kconfig	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/ppc64/Kconfig	2005-11-08 01:40:51.000000000 +0100
@@ -377,6 +377,8 @@ config CMDLINE
 	  some command-line options at build time by entering them here.  In
 	  most cases you will need to specify the root device here.
 
+source "drivers/perfctr/Kconfig"
+
 endmenu
 
 config ISA_DMA_API
diff -rupN linux-2.6.14/arch/ppc64/kernel/misc.S linux-2.6.14.perfctr27/arch/ppc64/kernel/misc.S
--- linux-2.6.14/arch/ppc64/kernel/misc.S	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/ppc64/kernel/misc.S	2005-11-08 01:40:51.000000000 +0100
@@ -1230,6 +1230,12 @@ _GLOBAL(sys_call_table32)
 	.llong .sys_inotify_init	/* 275 */
 	.llong .sys_inotify_add_watch
 	.llong .sys_inotify_rm_watch
+	.llong .sys_ni_syscall
+	.llong .sys_ni_syscall
+	.llong .sys_vperfctr_open	/* 280 */
+	.llong .sys_vperfctr_control
+	.llong .sys_vperfctr_write
+	.llong .sys_vperfctr_read
 
 	.balign 8
 _GLOBAL(sys_call_table)
@@ -1511,3 +1517,9 @@ _GLOBAL(sys_call_table)
 	.llong .sys_inotify_init	/* 275 */
 	.llong .sys_inotify_add_watch
 	.llong .sys_inotify_rm_watch
+	.llong .sys_ni_syscall
+	.llong .sys_ni_syscall
+	.llong .sys_vperfctr_open	/* 280 */
+	.llong .sys_vperfctr_control
+	.llong .sys_vperfctr_write
+	.llong .sys_vperfctr_read
diff -rupN linux-2.6.14/arch/ppc64/kernel/process.c linux-2.6.14.perfctr27/arch/ppc64/kernel/process.c
--- linux-2.6.14/arch/ppc64/kernel/process.c	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/ppc64/kernel/process.c	2005-11-08 01:40:51.000000000 +0100
@@ -37,6 +37,7 @@
 #include <linux/interrupt.h>
 #include <linux/utsname.h>
 #include <linux/kprobes.h>
+#include <linux/perfctr.h>
 
 #include <asm/pgtable.h>
 #include <asm/uaccess.h>
@@ -245,7 +246,9 @@ struct task_struct *__switch_to(struct t
 	}
 
 	local_irq_save(flags);
+	perfctr_suspend_thread(&prev->thread);
 	last = _switch(old_thread, new_thread);
+	perfctr_resume_thread(&current->thread);
 
 	local_irq_restore(flags);
 
@@ -345,6 +348,7 @@ void exit_thread(void)
 		last_task_used_altivec = NULL;
 #endif /* CONFIG_ALTIVEC */
 #endif /* CONFIG_SMP */
+	perfctr_exit_thread(&current->thread);
 }
 
 void flush_thread(void)
@@ -450,6 +454,8 @@ copy_thread(int nr, unsigned long clone_
  	 */
 	kregs->nip = *((unsigned long *)ret_from_fork);
 
+	perfctr_copy_task(p, regs);
+
 	return 0;
 }
 
diff -rupN linux-2.6.14/arch/x86_64/Kconfig linux-2.6.14.perfctr27/arch/x86_64/Kconfig
--- linux-2.6.14/arch/x86_64/Kconfig	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/x86_64/Kconfig	2005-11-08 01:40:55.000000000 +0100
@@ -421,6 +421,8 @@ config SECCOMP
 
 source kernel/Kconfig.hz
 
+source "drivers/perfctr/Kconfig"
+
 endmenu
 
 #
diff -rupN linux-2.6.14/arch/x86_64/ia32/ia32entry.S linux-2.6.14.perfctr27/arch/x86_64/ia32/ia32entry.S
--- linux-2.6.14/arch/x86_64/ia32/ia32entry.S	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/x86_64/ia32/ia32entry.S	2005-11-08 01:40:51.000000000 +0100
@@ -643,6 +643,12 @@ ia32_sys_call_table:
 	.quad sys_inotify_init
 	.quad sys_inotify_add_watch
 	.quad sys_inotify_rm_watch
+	.quad quiet_ni_syscall		/* pselect6 */
+	.quad quiet_ni_syscall		/* ppoll 295 */
+	.quad sys_vperfctr_open
+	.quad sys_vperfctr_control
+	.quad sys_vperfctr_write
+	.quad sys_vperfctr_read
 ia32_syscall_end:		
 	.rept IA32_NR_syscalls-(ia32_syscall_end-ia32_sys_call_table)/8
 		.quad ni_syscall
diff -rupN linux-2.6.14/arch/x86_64/kernel/entry.S linux-2.6.14.perfctr27/arch/x86_64/kernel/entry.S
--- linux-2.6.14/arch/x86_64/kernel/entry.S	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/x86_64/kernel/entry.S	2005-11-08 01:40:51.000000000 +0100
@@ -645,6 +645,11 @@ ENTRY(spurious_interrupt)
 	apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt
 #endif
 				
+#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_PERFCTR)
+ENTRY(perfctr_interrupt)
+	apicinterrupt LOCAL_PERFCTR_VECTOR,smp_perfctr_interrupt
+#endif
+
 /*
  * Exception entry points.
  */ 		
diff -rupN linux-2.6.14/arch/x86_64/kernel/i8259.c linux-2.6.14.perfctr27/arch/x86_64/kernel/i8259.c
--- linux-2.6.14/arch/x86_64/kernel/i8259.c	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/x86_64/kernel/i8259.c	2005-11-08 01:40:51.000000000 +0100
@@ -23,6 +23,7 @@
 #include <asm/delay.h>
 #include <asm/desc.h>
 #include <asm/apic.h>
+#include <asm/perfctr.h>
 
 /*
  * Common place to define all x86 IRQ vectors
@@ -590,6 +591,8 @@ void __init init_IRQ(void)
 	set_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
 #endif
 
+	perfctr_vector_init();
+
 	/*
 	 * Set the clock to HZ Hz, we already have a valid
 	 * vector now:
diff -rupN linux-2.6.14/arch/x86_64/kernel/process.c linux-2.6.14.perfctr27/arch/x86_64/kernel/process.c
--- linux-2.6.14/arch/x86_64/kernel/process.c	2005-10-28 11:24:06.000000000 +0200
+++ linux-2.6.14.perfctr27/arch/x86_64/kernel/process.c	2005-11-08 01:40:51.000000000 +0100
@@ -34,6 +34,7 @@
 #include <linux/delay.h>
 #include <linux/ptrace.h>
 #include <linux/utsname.h>
+#include <linux/perfctr.h>
 #include <linux/random.h>
 #include <linux/kprobes.h>
 
@@ -345,6 +346,7 @@ void exit_thread(void)
 		t->io_bitmap_max = 0;
 		put_cpu();
 	}
+	perfctr_exit_thread(&me->thread);
 }
 
 void flush_thread(void)
@@ -454,6 +456,8 @@ int copy_thread(int nr, unsigned long cl
 	asm("mov %%es,%0" : "=m" (p->thread.es));
 	asm("mov %%ds,%0" : "=m" (p->thread.ds));
 
+	perfctr_copy_task(p, regs);
+
 	if (unlikely(me->thread.io_bitmap_ptr != NULL)) { 
 		p->thread.io_bitmap_ptr = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
 		if (!p->thread.io_bitmap_ptr) {
@@ -603,6 +607,8 @@ struct task_struct *__switch_to(struct t
 		}
 	}
 
+	perfctr_resume_thread(next);
+
 	return prev_p;
 }
 
diff -rupN linux-2.6.14/drivers/Makefile linux-2.6.14.perfctr27/drivers/Makefile
--- linux-2.6.14/drivers/Makefile	2005-10-28 11:24:07.000000000 +0200
+++ linux-2.6.14.perfctr27/drivers/Makefile	2005-11-08 01:40:51.000000000 +0100
@@ -63,6 +63,7 @@ obj-$(CONFIG_MCA)		+= mca/
 obj-$(CONFIG_EISA)		+= eisa/
 obj-$(CONFIG_CPU_FREQ)		+= cpufreq/
 obj-$(CONFIG_MMC)		+= mmc/
+obj-$(CONFIG_PERFCTR)		+= perfctr/
 obj-$(CONFIG_INFINIBAND)	+= infiniband/
 obj-$(CONFIG_SGI_IOC4)		+= sn/
 obj-y				+= firmware/
diff -rupN linux-2.6.14/include/asm-i386/mach-default/irq_vectors.h linux-2.6.14.perfctr27/include/asm-i386/mach-default/irq_vectors.h
--- linux-2.6.14/include/asm-i386/mach-default/irq_vectors.h	2004-05-10 11:14:37.000000000 +0200
+++ linux-2.6.14.perfctr27/include/asm-i386/mach-default/irq_vectors.h	2005-11-08 01:40:51.000000000 +0100
@@ -56,14 +56,15 @@
  * sources per level' errata.
  */
 #define LOCAL_TIMER_VECTOR	0xef
+#define LOCAL_PERFCTR_VECTOR	0xee
 
 /*
- * First APIC vector available to drivers: (vectors 0x30-0xee)
+ * First APIC vector available to drivers: (vectors 0x30-0xed)
  * we start at 0x31 to spread out vectors evenly between priority
  * levels. (0x80 is the syscall vector)
  */
 #define FIRST_DEVICE_VECTOR	0x31
-#define FIRST_SYSTEM_VECTOR	0xef
+#define FIRST_SYSTEM_VECTOR	0xee
 
 #define TIMER_IRQ 0
 
diff -rupN linux-2.6.14/include/asm-i386/mach-visws/irq_vectors.h linux-2.6.14.perfctr27/include/asm-i386/mach-visws/irq_vectors.h
--- linux-2.6.14/include/asm-i386/mach-visws/irq_vectors.h	2004-01-09 13:19:11.000000000 +0100
+++ linux-2.6.14.perfctr27/include/asm-i386/mach-visws/irq_vectors.h	2005-11-08 01:40:51.000000000 +0100
@@ -35,14 +35,15 @@
  * sources per level' errata.
  */
 #define LOCAL_TIMER_VECTOR	0xef
+#define LOCAL_PERFCTR_VECTOR	0xee
 
 /*
- * First APIC vector available to drivers: (vectors 0x30-0xee)
+ * First APIC vector available to drivers: (vectors 0x30-0xed)
  * we start at 0x31 to spread out vectors evenly between priority
  * levels. (0x80 is the syscall vector)
  */
 #define FIRST_DEVICE_VECTOR	0x31
-#define FIRST_SYSTEM_VECTOR	0xef
+#define FIRST_SYSTEM_VECTOR	0xee
 
 #define TIMER_IRQ 0
 
diff -rupN linux-2.6.14/include/asm-i386/processor.h linux-2.6.14.perfctr27/include/asm-i386/processor.h
--- linux-2.6.14/include/asm-i386/processor.h	2005-10-28 11:24:11.000000000 +0200
+++ linux-2.6.14.perfctr27/include/asm-i386/processor.h	2005-11-08 01:40:51.000000000 +0100
@@ -458,6 +458,8 @@ struct thread_struct {
  	unsigned long	iopl;
 /* max allowed port in the bitmap, in bytes: */
 	unsigned long	io_bitmap_max;
+/* performance counters */
+	struct vperfctr *perfctr;
 };
 
 #define INIT_THREAD  {							\
diff -rupN linux-2.6.14/include/asm-i386/system.h linux-2.6.14.perfctr27/include/asm-i386/system.h
--- linux-2.6.14/include/asm-i386/system.h	2005-10-28 11:24:11.000000000 +0200
+++ linux-2.6.14.perfctr27/include/asm-i386/system.h	2005-11-08 01:40:51.000000000 +0100
@@ -14,6 +14,7 @@ extern struct task_struct * FASTCALL(__s
 
 #define switch_to(prev,next,last) do {					\
 	unsigned long esi,edi;						\
+	perfctr_suspend_thread(&(prev)->thread);			\
 	asm volatile("pushl %%ebp\n\t"					\
 		     "movl %%esp,%0\n\t"	/* save ESP */		\
 		     "movl %5,%%esp\n\t"	/* restore ESP */	\
diff -rupN linux-2.6.14/include/asm-i386/unistd.h linux-2.6.14.perfctr27/include/asm-i386/unistd.h
--- linux-2.6.14/include/asm-i386/unistd.h	2005-10-28 11:24:11.000000000 +0200
+++ linux-2.6.14.perfctr27/include/asm-i386/unistd.h	2005-11-08 01:40:51.000000000 +0100
@@ -299,8 +299,12 @@
 #define __NR_inotify_init	291
 #define __NR_inotify_add_watch	292
 #define __NR_inotify_rm_watch	293
+#define __NR_vperfctr_open	296
+#define __NR_vperfctr_control	(__NR_vperfctr_open+1)
+#define __NR_vperfctr_write	(__NR_vperfctr_open+2)
+#define __NR_vperfctr_read	(__NR_vperfctr_open+3)
 
-#define NR_syscalls 294
+#define NR_syscalls 300
 
 /*
  * user-visible error numbers are in the range -1 - -128: see
diff -rupN linux-2.6.14/include/asm-ppc/processor.h linux-2.6.14.perfctr27/include/asm-ppc/processor.h
--- linux-2.6.14/include/asm-ppc/processor.h	2005-03-02 19:24:19.000000000 +0100
+++ linux-2.6.14.perfctr27/include/asm-ppc/processor.h	2005-11-08 01:40:51.000000000 +0100
@@ -122,6 +122,9 @@ struct thread_struct {
 	unsigned long	spefscr;	/* SPE & eFP status */
 	int		used_spe;	/* set if process has used spe */
 #endif /* CONFIG_SPE */
+#ifdef CONFIG_PERFCTR_VIRTUAL
+	struct vperfctr *perfctr;	/* performance counters */
+#endif
 };
 
 #define ARCH_MIN_TASKALIGN 16
diff -rupN linux-2.6.14/include/asm-ppc/reg.h linux-2.6.14.perfctr27/include/asm-ppc/reg.h
--- linux-2.6.14/include/asm-ppc/reg.h	2005-10-28 11:24:12.000000000 +0200
+++ linux-2.6.14.perfctr27/include/asm-ppc/reg.h	2005-11-08 01:40:51.000000000 +0100
@@ -275,22 +275,14 @@
 #define SPRN_LDSTCR	0x3f8	/* Load/Store control register */
 #define SPRN_LDSTDB	0x3f4	/* */
 #define SPRN_LR		0x008	/* Link Register */
-#define SPRN_MMCR0	0x3B8	/* Monitor Mode Control Register 0 */
-#define SPRN_MMCR1	0x3BC	/* Monitor Mode Control Register 1 */
 #ifndef SPRN_PIR
 #define SPRN_PIR	0x3FF	/* Processor Identification Register */
 #endif
-#define SPRN_PMC1	0x3B9	/* Performance Counter Register 1 */
-#define SPRN_PMC2	0x3BA	/* Performance Counter Register 2 */
-#define SPRN_PMC3	0x3BD	/* Performance Counter Register 3 */
-#define SPRN_PMC4	0x3BE	/* Performance Counter Register 4 */
 #define SPRN_PTEHI	0x3D5	/* 981 7450 PTE HI word (S/W TLB load) */
 #define SPRN_PTELO	0x3D6	/* 982 7450 PTE LO word (S/W TLB load) */
 #define SPRN_PVR	0x11F	/* Processor Version Register */
 #define SPRN_RPA	0x3D6	/* Required Physical Address Register */
-#define SPRN_SDA	0x3BF	/* Sampled Data Address Register */
 #define SPRN_SDR1	0x019	/* MMU Hash Base Register */
-#define SPRN_SIA	0x3BB	/* Sampled Instruction Address Register */
 #define SPRN_SPRG0	0x110	/* Special Purpose Register General 0 */
 #define SPRN_SPRG1	0x111	/* Special Purpose Register General 1 */
 #define SPRN_SPRG2	0x112	/* Special Purpose Register General 2 */
@@ -317,16 +309,79 @@
 #define SPRN_THRM3	0x3FE		/* Thermal Management Register 3 */
 #define THRM3_E		(1<<0)
 #define SPRN_TLBMISS	0x3D4		/* 980 7450 TLB Miss Register */
-#define SPRN_UMMCR0	0x3A8	/* User Monitor Mode Control Register 0 */
-#define SPRN_UMMCR1	0x3AC	/* User Monitor Mode Control Register 0 */
-#define SPRN_UPMC1	0x3A9	/* User Performance Counter Register 1 */
-#define SPRN_UPMC2	0x3AA	/* User Performance Counter Register 2 */
-#define SPRN_UPMC3	0x3AD	/* User Performance Counter Register 3 */
-#define SPRN_UPMC4	0x3AE	/* User Performance Counter Register 4 */
-#define SPRN_USIA	0x3AB	/* User Sampled Instruction Address Register */
 #define SPRN_VRSAVE	0x100	/* Vector Register Save Register */
 #define SPRN_XER	0x001	/* Fixed Point Exception Register */
 
+/* Performance-monitoring control and counter registers */
+#define SPRN_MMCR0	0x3B8	/* Monitor Mode Control Register 0 (604 and up) */
+#define SPRN_MMCR1	0x3BC	/* Monitor Mode Control Register 1 (604e and up) */
+#define SPRN_MMCR2	0x3B0	/* Monitor Mode Control Register 2 (7400 and up) */
+#define SPRN_PMC1	0x3B9	/* Performance Counter Register 1 (604 and up) */
+#define SPRN_PMC2	0x3BA	/* Performance Counter Register 2 (604 and up) */
+#define SPRN_PMC3	0x3BD	/* Performance Counter Register 3 (604e and up) */
+#define SPRN_PMC4	0x3BE	/* Performance Counter Register 4 (604e and up) */
+#define SPRN_PMC5	0x3B1	/* Performance Counter Register 5 (7450 and up) */
+#define SPRN_PMC6	0x3B2	/* Performance Counter Register 6 (7450 and up) */
+#define SPRN_SIA	0x3BB	/* Sampled Instruction Address Register (604 and up) */
+#define SPRN_SDA	0x3BF	/* Sampled Data Address Register (604/604e only) */
+#define SPRN_BAMR	0x3B7	/* Breakpoint Address Mask Register (7400 and up) */
+
+#define SPRN_UMMCR0	0x3A8	/* User Monitor Mode Control Register 0 (750 and up) */
+#define SPRN_UMMCR1	0x3AC	/* User Monitor Mode Control Register 0 (750 and up) */
+#define SPRN_UMMCR2	0x3A0	/* User Monitor Mode Control Register 0 (7400 and up) */
+#define SPRN_UPMC1	0x3A9	/* User Performance Counter Register 1 (750 and up) */
+#define SPRN_UPMC2	0x3AA	/* User Performance Counter Register 2 (750 and up) */
+#define SPRN_UPMC3	0x3AD	/* User Performance Counter Register 3 (750 and up) */
+#define SPRN_UPMC4	0x3AE	/* User Performance Counter Register 4 (750 and up) */
+#define SPRN_UPMC5	0x3A1	/* User Performance Counter Register 5 (7450 and up) */
+#define SPRN_UPMC6	0x3A2	/* User Performance Counter Register 5 (7450 and up) */
+#define SPRN_USIA	0x3AB	/* User Sampled Instruction Address Register (750 and up) */
+#define SPRN_UBAMR	0x3A7	/* User Breakpoint Address Mask Register (7400 and up) */
+
+/* MMCR0 layout (74xx terminology) */
+#define MMCR0_FC		0x80000000 /* Freeze counters unconditionally. */
+#define MMCR0_FCS		0x40000000 /* Freeze counters while MSR[PR]=0 (supervisor mode). */
+#define MMCR0_FCP		0x20000000 /* Freeze counters while MSR[PR]=1 (user mode). */
+#define MMCR0_FCM1		0x10000000 /* Freeze counters while MSR[PM]=1. */
+#define MMCR0_FCM0		0x08000000 /* Freeze counters while MSR[PM]=0. */
+#define MMCR0_PMXE		0x04000000 /* Enable performance monitor exceptions.
+					    * Cleared by hardware when a PM exception occurs.
+					    * 604: PMXE is not cleared by hardware.
+					    */
+#define MMCR0_FCECE		0x02000000 /* Freeze counters on enabled condition or event.
+					    * FCECE is treated as 0 if TRIGGER is 1.
+					    * 74xx: FC is set when the event occurs.
+					    * 604/750: ineffective when PMXE=0.
+					    */
+#define MMCR0_TBSEL		0x01800000 /* Time base lower (TBL) bit selector.
+					    * 00: bit 31, 01: bit 23, 10: bit 19, 11: bit 15.
+					    */
+#define MMCR0_TBEE		0x00400000 /* Enable event on TBL bit transition from 0 to 1. */
+#define MMCR0_THRESHOLD		0x003F0000 /* Threshold value for certain events. */
+#define MMCR0_PMC1CE		0x00008000 /* Enable event on PMC1 overflow. */
+#define MMCR0_PMCjCE		0x00004000 /* Enable event on PMC2-PMC6 overflow.
+					    * 604/750: Overrides FCECE (DISCOUNT).
+					    */
+#define MMCR0_TRIGGER		0x00002000 /* Disable PMC2-PMC6 until PMC1 overflow or other event.
+					    * 74xx: cleared by hardware when the event occurs.
+					    */
+#define MMCR0_PMC1SEL		0x00001FB0 /* PMC1 event selector, 7 bits. */
+#define MMCR0_PMC2SEL		0x0000003F /* PMC2 event selector, 6 bits. */
+
+/* MMCR1 layout (604e-7457) */
+#define MMCR1_PMC3SEL		0xF8000000 /* PMC3 event selector, 5 bits. */
+#define MMCR1_PMC4SEL		0x07B00000 /* PMC4 event selector, 5 bits. */
+#define MMCR1_PMC5SEL		0x003E0000 /* PMC5 event selector, 5 bits. (745x only) */
+#define MMCR1_PMC6SEL		0x0001F800 /* PMC6 event selector, 6 bits. (745x only) */
+#define MMCR1__RESERVED		0x000007FF /* should be zero */
+
+/* MMCR2 layout (7400-7457) */
+#define MMCR2_THRESHMULT	0x80000000 /* MMCR0[THRESHOLD] multiplier. */
+#define MMCR2_SMCNTEN		0x40000000 /* 7400/7410 only, should be zero. */
+#define MMCR2_SMINTEN		0x20000000 /* 7400/7410 only, should be zero. */
+#define MMCR2__RESERVED		0x1FFFFFFF /* should be zero */
+#define MMCR2_RESERVED		(MMCR2_SMCNTEN | MMCR2_SMINTEN | MMCR2__RESERVED)
+
 /* Bit definitions for MMCR0 and PMC1 / PMC2. */
 #define MMCR0_PMC1_CYCLES	(1 << 7)
 #define MMCR0_PMC1_ICACHEMISS	(5 << 7)
@@ -335,7 +390,6 @@
 #define MMCR0_PMC2_CYCLES	0x1
 #define MMCR0_PMC2_ITLB		0x7
 #define MMCR0_PMC2_LOADMISSTIME	0x5
-#define MMCR0_PMXE	(1 << 26)
 
 /* Processor Version Register */
 
diff -rupN linux-2.6.14/include/asm-ppc/unistd.h linux-2.6.14.perfctr27/include/asm-ppc/unistd.h
--- linux-2.6.14/include/asm-ppc/unistd.h	2005-08-29 14:34:33.000000000 +0200
+++ linux-2.6.14.perfctr27/include/asm-ppc/unistd.h	2005-11-08 01:40:51.000000000 +0100
@@ -282,8 +282,12 @@
 #define __NR_inotify_init	275
 #define __NR_inotify_add_watch	276
 #define __NR_inotify_rm_watch	277
+#define __NR_vperfctr_open	280
+#define __NR_vperfctr_control	(__NR_vperfctr_open+1)
+#define __NR_vperfctr_write	(__NR_vperfctr_open+2)
+#define __NR_vperfctr_read	(__NR_vperfctr_open+3)
 
-#define __NR_syscalls		278
+#define __NR_syscalls		284
 
 #define __NR(n)	#n
 
diff -rupN linux-2.6.14/include/asm-ppc64/processor.h linux-2.6.14.perfctr27/include/asm-ppc64/processor.h
--- linux-2.6.14/include/asm-ppc64/processor.h	2005-10-28 11:24:12.000000000 +0200
+++ linux-2.6.14.perfctr27/include/asm-ppc64/processor.h	2005-11-08 01:40:51.000000000 +0100
@@ -442,6 +442,8 @@ struct thread_struct {
 	unsigned long	vrsave;
 	int		used_vr;	/* set if process has used altivec */
 #endif /* CONFIG_ALTIVEC */
+	/* performance counters */
+	struct vperfctr *perfctr;
 };
 
 #define ARCH_MIN_TASKALIGN 16
diff -rupN linux-2.6.14/include/asm-ppc64/unistd.h linux-2.6.14.perfctr27/include/asm-ppc64/unistd.h
--- linux-2.6.14/include/asm-ppc64/unistd.h	2005-08-29 14:34:33.000000000 +0200
+++ linux-2.6.14.perfctr27/include/asm-ppc64/unistd.h	2005-11-08 01:40:51.000000000 +0100
@@ -288,8 +288,12 @@
 #define __NR_inotify_init	275
 #define __NR_inotify_add_watch	276
 #define __NR_inotify_rm_watch	277
+#define __NR_vperfctr_open	280
+#define __NR_vperfctr_control	(__NR_vperfctr_open+1)
+#define __NR_vperfctr_write	(__NR_vperfctr_open+2)
+#define __NR_vperfctr_read	(__NR_vperfctr_open+3)
 
-#define __NR_syscalls		278
+#define __NR_syscalls		284
 #ifdef __KERNEL__
 #define NR_syscalls	__NR_syscalls
 #endif
diff -rupN linux-2.6.14/include/asm-x86_64/hw_irq.h linux-2.6.14.perfctr27/include/asm-x86_64/hw_irq.h
--- linux-2.6.14/include/asm-x86_64/hw_irq.h	2005-10-28 11:24:12.000000000 +0200
+++ linux-2.6.14.perfctr27/include/asm-x86_64/hw_irq.h	2005-11-08 01:40:51.000000000 +0100
@@ -67,14 +67,15 @@ struct hw_interrupt_type;
  * sources per level' errata.
  */
 #define LOCAL_TIMER_VECTOR	0xef
+#define LOCAL_PERFCTR_VECTOR	0xee
 
 /*
- * First APIC vector available to drivers: (vectors 0x30-0xee)
+ * First APIC vector available to drivers: (vectors 0x30-0xed)
  * we start at 0x31 to spread out vectors evenly between priority
  * levels. (0x80 is the syscall vector)
  */
 #define FIRST_DEVICE_VECTOR	0x31
-#define FIRST_SYSTEM_VECTOR	0xef   /* duplicated in irq.h */
+#define FIRST_SYSTEM_VECTOR	0xee   /* duplicated in irq.h */
 
 
 #ifndef __ASSEMBLY__
diff -rupN linux-2.6.14/include/asm-x86_64/ia32_unistd.h linux-2.6.14.perfctr27/include/asm-x86_64/ia32_unistd.h
--- linux-2.6.14/include/asm-x86_64/ia32_unistd.h	2005-08-29 14:34:33.000000000 +0200
+++ linux-2.6.14.perfctr27/include/asm-x86_64/ia32_unistd.h	2005-11-08 01:40:51.000000000 +0100
@@ -299,7 +299,11 @@
 #define __NR_ia32_inotify_init		291
 #define __NR_ia32_inotify_add_watch	292
 #define __NR_ia32_inotify_rm_watch	293
+#define __NR_ia32_vperfctr_open		296
+#define __NR_ia32_vperfctr_control	(__NR_ia32_vperfctr_open+1)
+#define __NR_ia32_vperfctr_write	(__NR_ia32_vperfctr_open+2)
+#define __NR_ia32_vperfctr_read		(__NR_ia32_vperfctr_open+3)
 
-#define IA32_NR_syscalls 294	/* must be > than biggest syscall! */
+#define IA32_NR_syscalls 300	/* must be > than biggest syscall! */
 
 #endif /* _ASM_X86_64_IA32_UNISTD_H_ */
diff -rupN linux-2.6.14/include/asm-x86_64/irq.h linux-2.6.14.perfctr27/include/asm-x86_64/irq.h
--- linux-2.6.14/include/asm-x86_64/irq.h	2005-10-28 11:24:12.000000000 +0200
+++ linux-2.6.14.perfctr27/include/asm-x86_64/irq.h	2005-11-08 01:40:51.000000000 +0100
@@ -29,7 +29,7 @@
  */
 #define NR_VECTORS 256
 
-#define FIRST_SYSTEM_VECTOR	0xef   /* duplicated in hw_irq.h */
+#define FIRST_SYSTEM_VECTOR	0xee   /* duplicated in hw_irq.h */
 
 #ifdef CONFIG_PCI_MSI
 #define NR_IRQS FIRST_SYSTEM_VECTOR
diff -rupN linux-2.6.14/include/asm-x86_64/processor.h linux-2.6.14.perfctr27/include/asm-x86_64/processor.h
--- linux-2.6.14/include/asm-x86_64/processor.h	2005-10-28 11:24:12.000000000 +0200
+++ linux-2.6.14.perfctr27/include/asm-x86_64/processor.h	2005-11-08 01:40:51.000000000 +0100
@@ -252,6 +252,8 @@ struct thread_struct {
 	unsigned io_bitmap_max;
 /* cached TLS descriptors. */
 	u64 tls_array[GDT_ENTRY_TLS_ENTRIES];
+/* performance counters */
+	struct vperfctr *perfctr;
 } __attribute__((aligned(16)));
 
 #define INIT_THREAD  { \
diff -rupN linux-2.6.14/include/asm-x86_64/system.h linux-2.6.14.perfctr27/include/asm-x86_64/system.h
--- linux-2.6.14/include/asm-x86_64/system.h	2005-10-28 11:24:12.000000000 +0200
+++ linux-2.6.14.perfctr27/include/asm-x86_64/system.h	2005-11-08 01:40:51.000000000 +0100
@@ -26,7 +26,8 @@
 #define __EXTRA_CLOBBER  \
 	,"rcx","rbx","rdx","r8","r9","r10","r11","r12","r13","r14","r15"
 
-#define switch_to(prev,next,last) \
+#define switch_to(prev,next,last) do { \
+	perfctr_suspend_thread(&(prev)->thread); \
 	asm volatile(SAVE_CONTEXT						    \
 		     "movq %%rsp,%P[threadrsp](%[prev])\n\t" /* save RSP */	  \
 		     "movq %P[threadrsp](%[next]),%%rsp\n\t" /* restore RSP */	  \
@@ -46,7 +47,8 @@
 		       [tif_fork] "i" (TIF_FORK),			  \
 		       [thread_info] "i" (offsetof(struct task_struct, thread_info)), \
 		       [pda_pcurrent] "i" (offsetof(struct x8664_pda, pcurrent))   \
-		     : "memory", "cc" __EXTRA_CLOBBER)
+		     : "memory", "cc" __EXTRA_CLOBBER); \
+} while (0)
     
 extern void load_gs_index(unsigned); 
 
diff -rupN linux-2.6.14/include/asm-x86_64/unistd.h linux-2.6.14.perfctr27/include/asm-x86_64/unistd.h
--- linux-2.6.14/include/asm-x86_64/unistd.h	2005-08-29 14:34:33.000000000 +0200
+++ linux-2.6.14.perfctr27/include/asm-x86_64/unistd.h	2005-11-08 01:40:55.000000000 +0100
@@ -571,8 +571,18 @@ __SYSCALL(__NR_inotify_init, sys_inotify
 __SYSCALL(__NR_inotify_add_watch, sys_inotify_add_watch)
 #define __NR_inotify_rm_watch	255
 __SYSCALL(__NR_inotify_rm_watch, sys_inotify_rm_watch)
+#define __NR_migrate_pages     256
+__SYSCALL(__NR_migrate_pages, sys_ni_syscall)
+#define __NR_vperfctr_open	257
+__SYSCALL(__NR_vperfctr_open, sys_vperfctr_open)
+#define __NR_vperfctr_control	(__NR_vperfctr_open+1)
+__SYSCALL(__NR_vperfctr_control, sys_vperfctr_control)
+#define __NR_vperfctr_write	(__NR_vperfctr_open+2)
+__SYSCALL(__NR_vperfctr_write, sys_vperfctr_write)
+#define __NR_vperfctr_read	(__NR_vperfctr_open+3)
+__SYSCALL(__NR_vperfctr_read, sys_vperfctr_read)
 
-#define __NR_syscall_max __NR_inotify_rm_watch
+#define __NR_syscall_max __NR_vperfctr_read
 #ifndef __NO_STUBS
 
 /* user-visible error numbers are in the range -1 - -4095 */
diff -rupN linux-2.6.14/include/linux/sched.h linux-2.6.14.perfctr27/include/linux/sched.h
--- linux-2.6.14/include/linux/sched.h	2005-10-28 11:24:12.000000000 +0200
+++ linux-2.6.14.perfctr27/include/linux/sched.h	2005-11-08 01:40:51.000000000 +0100
@@ -1168,6 +1168,9 @@ extern void unhash_process(struct task_s
  * subscriptions and synchronises with wait4().  Also used in procfs.  Also
  * pins the final release of task.io_context.
  *
+ * Synchronises set_cpus_allowed(), unlink, and creat of ->thread.perfctr.
+ * [if CONFIG_PERFCTR_VIRTUAL]
+ *
  * Nests both inside and outside of read_lock(&tasklist_lock).
  * It must not be nested with write_lock_irq(&tasklist_lock),
  * neither inside nor outside.
diff -rupN linux-2.6.14/kernel/exit.c linux-2.6.14.perfctr27/kernel/exit.c
--- linux-2.6.14/kernel/exit.c	2005-10-28 11:24:12.000000000 +0200
+++ linux-2.6.14.perfctr27/kernel/exit.c	2005-11-08 01:40:51.000000000 +0100
@@ -26,6 +26,7 @@
 #include <linux/proc_fs.h>
 #include <linux/mempolicy.h>
 #include <linux/cpuset.h>
+#include <linux/perfctr.h>
 #include <linux/syscalls.h>
 #include <linux/signal.h>
 
@@ -100,6 +101,7 @@ repeat: 
 		zap_leader = (leader->exit_signal == -1);
 	}
 
+	perfctr_release_task(p);
 	sched_exit(p);
 	write_unlock_irq(&tasklist_lock);
 	spin_unlock(&p->proc_lock);
diff -rupN linux-2.6.14/kernel/sched.c linux-2.6.14.perfctr27/kernel/sched.c
--- linux-2.6.14/kernel/sched.c	2005-10-28 11:24:12.000000000 +0200
+++ linux-2.6.14.perfctr27/kernel/sched.c	2005-11-08 01:40:51.000000000 +0100
@@ -42,6 +42,7 @@
 #include <linux/cpu.h>
 #include <linux/cpuset.h>
 #include <linux/percpu.h>
+#include <linux/perfctr.h>
 #include <linux/kthread.h>
 #include <linux/seq_file.h>
 #include <linux/syscalls.h>
@@ -4361,6 +4362,8 @@ int set_cpus_allowed(task_t *p, cpumask_
 	migration_req_t req;
 	runqueue_t *rq;
 
+	perfctr_set_cpus_allowed(p, new_mask);
+
 	rq = task_rq_lock(p, &flags);
 	if (!cpus_intersects(new_mask, cpu_online_map)) {
 		ret = -EINVAL;
diff -rupN linux-2.6.14/kernel/sys_ni.c linux-2.6.14.perfctr27/kernel/sys_ni.c
--- linux-2.6.14/kernel/sys_ni.c	2005-08-29 14:34:34.000000000 +0200
+++ linux-2.6.14.perfctr27/kernel/sys_ni.c	2005-11-08 01:40:51.000000000 +0100
@@ -68,6 +68,10 @@ cond_syscall(compat_sys_mq_timedsend);
 cond_syscall(compat_sys_mq_timedreceive);
 cond_syscall(compat_sys_mq_notify);
 cond_syscall(compat_sys_mq_getsetattr);
+cond_syscall(sys_vperfctr_open);
+cond_syscall(sys_vperfctr_control);
+cond_syscall(sys_vperfctr_write);
+cond_syscall(sys_vperfctr_read);
 cond_syscall(sys_mbind);
 cond_syscall(sys_get_mempolicy);
 cond_syscall(sys_set_mempolicy);
diff -rupN linux-2.6.14/kernel/timer.c linux-2.6.14.perfctr27/kernel/timer.c
--- linux-2.6.14/kernel/timer.c	2005-10-28 11:24:12.000000000 +0200
+++ linux-2.6.14.perfctr27/kernel/timer.c	2005-11-08 01:40:51.000000000 +0100
@@ -32,6 +32,7 @@
 #include <linux/jiffies.h>
 #include <linux/posix-timers.h>
 #include <linux/cpu.h>
+#include <linux/perfctr.h>
 #include <linux/syscalls.h>
 
 #include <asm/uaccess.h>
@@ -846,6 +847,7 @@ void update_process_times(int user_tick)
 		account_user_time(p, jiffies_to_cputime(1));
 	else
 		account_system_time(p, HARDIRQ_OFFSET, jiffies_to_cputime(1));
+	perfctr_sample_thread(&p->thread);
 	run_local_timers();
 	if (rcu_pending(cpu))
 		rcu_check_callbacks(cpu, user_tick);