diff -rupN linux-2.6.20/CREDITS linux-2.6.20.perfctr27/CREDITS
--- linux-2.6.20/CREDITS	2007-09-28 09:30:15.000000000 +0200
+++ linux-2.6.20.perfctr27/CREDITS	2007-09-28 09:33:35.000000000 +0200
@@ -2668,9 +2668,10 @@ S: Ottawa, Ontario
 S: Canada K2P 0X8
 
 N: Mikael Pettersson
-E: mikpe@csd.uu.se
-W: http://www.csd.uu.se/~mikpe/
+E: mikpe@it.uu.se
+W: http://user.it.uu.se/~mikpe/
 D: Miscellaneous fixes
+D: Performance-monitoring counters driver
 
 N: Reed H. Petty
 E: rhp@draper.net
diff -rupN linux-2.6.20/MAINTAINERS linux-2.6.20.perfctr27/MAINTAINERS
--- linux-2.6.20/MAINTAINERS	2007-09-28 09:30:15.000000000 +0200
+++ linux-2.6.20.perfctr27/MAINTAINERS	2007-09-28 09:33:35.000000000 +0200
@@ -2577,6 +2577,12 @@ M:	nagar@watson.ibm.com
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
 
+PERFORMANCE-MONITORING COUNTERS DRIVER
+P:	Mikael Pettersson
+M:	mikpe@it.uu.se
+W:	http://user.it.uu.se/~mikpe/linux/perfctr/
+S:	Maintained
+
 PERSONALITY HANDLING
 P:	Christoph Hellwig
 M:	hch@infradead.org
diff -rupN linux-2.6.20/arch/i386/Kconfig linux-2.6.20.perfctr27/arch/i386/Kconfig
--- linux-2.6.20/arch/i386/Kconfig	2007-09-28 09:30:15.000000000 +0200
+++ linux-2.6.20.perfctr27/arch/i386/Kconfig	2007-09-28 09:33:35.000000000 +0200
@@ -745,6 +745,8 @@ config SECCOMP
 
 	  If unsure, say Y. Only embedded should say N here.
 
+source "drivers/perfctr/Kconfig"
+
 source kernel/Kconfig.hz
 
 config KEXEC
diff -rupN linux-2.6.20/arch/i386/kernel/entry.S linux-2.6.20.perfctr27/arch/i386/kernel/entry.S
--- linux-2.6.20/arch/i386/kernel/entry.S	2007-09-28 09:30:15.000000000 +0200
+++ linux-2.6.20.perfctr27/arch/i386/kernel/entry.S	2007-09-28 09:33:35.000000000 +0200
@@ -626,6 +626,22 @@ 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)
+	RING0_INT_FRAME
+	pushl $~(LOCAL_PERFCTR_VECTOR)
+	CFI_ADJUST_CFA_OFFSET 4
+	SAVE_ALL
+	TRACE_IRQS_OFF
+	pushl %esp
+	CFI_ADJUST_CFA_OFFSET 4
+	call smp_perfctr_interrupt
+	addl $4, %esp
+	CFI_ADJUST_CFA_OFFSET -4
+	jmp ret_from_intr
+	CFI_ENDPROC
+#endif
+
 KPROBE_ENTRY(page_fault)
 	RING0_EC_FRAME
 	pushl $do_page_fault
diff -rupN linux-2.6.20/arch/i386/kernel/i8259.c linux-2.6.20.perfctr27/arch/i386/kernel/i8259.c
--- linux-2.6.20/arch/i386/kernel/i8259.c	2007-09-28 09:30:15.000000000 +0200
+++ linux-2.6.20.perfctr27/arch/i386/kernel/i8259.c	2007-09-28 09:33:35.000000000 +0200
@@ -22,6 +22,7 @@
 #include <asm/apic.h>
 #include <asm/arch_hooks.h>
 #include <asm/i8259.h>
+#include <asm/perfctr.h>
 
 #include <io_ports.h>
 
@@ -409,6 +410,8 @@ void __init native_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-2.6.20/arch/i386/kernel/process.c linux-2.6.20.perfctr27/arch/i386/kernel/process.c
--- linux-2.6.20/arch/i386/kernel/process.c	2007-09-28 09:30:15.000000000 +0200
+++ linux-2.6.20.perfctr27/arch/i386/kernel/process.c	2007-09-28 09:33:35.000000000 +0200
@@ -32,6 +32,7 @@
 #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>
@@ -376,6 +377,7 @@ void exit_thread(void)
 		tss->io_bitmap_base = INVALID_IO_BITMAP_OFFSET;
 		put_cpu();
 	}
+	perfctr_exit_thread(&current->thread);
 }
 
 void flush_thread(void)
@@ -427,6 +429,8 @@ int copy_thread(int nr, unsigned long cl
 
 	savesegment(fs,p->thread.fs);
 
+	perfctr_copy_task(p, regs);
+
 	tsk = current;
 	if (unlikely(test_tsk_thread_flag(tsk, TIF_IO_BITMAP))) {
 		p->thread.io_bitmap_ptr = kmemdup(tsk->thread.io_bitmap_ptr,
@@ -695,6 +699,8 @@ struct task_struct fastcall * __switch_t
 	if (next_p->fpu_counter > 5)
 		math_state_restore();
 
+	perfctr_resume_thread(next);
+
 	return prev_p;
 }
 
diff -rupN linux-2.6.20/arch/i386/kernel/syscall_table.S linux-2.6.20.perfctr27/arch/i386/kernel/syscall_table.S
--- linux-2.6.20/arch/i386/kernel/syscall_table.S	2007-09-28 09:07:25.000000000 +0200
+++ linux-2.6.20.perfctr27/arch/i386/kernel/syscall_table.S	2007-09-28 09:33:35.000000000 +0200
@@ -319,3 +319,12 @@ ENTRY(sys_call_table)
 	.long sys_move_pages
 	.long sys_getcpu
 	.long sys_epoll_pwait
+	.long sys_ni_syscall		/* 320 */
+	.long sys_ni_syscall
+	.long sys_ni_syscall
+	.long sys_ni_syscall
+	.long sys_ni_syscall
+	.long sys_vperfctr_open		/* 325 */
+	.long sys_vperfctr_control
+	.long sys_vperfctr_write
+	.long sys_vperfctr_read
diff -rupN linux-2.6.20/arch/powerpc/Kconfig linux-2.6.20.perfctr27/arch/powerpc/Kconfig
--- linux-2.6.20/arch/powerpc/Kconfig	2007-09-28 09:30:15.000000000 +0200
+++ linux-2.6.20.perfctr27/arch/powerpc/Kconfig	2007-09-28 09:33:35.000000000 +0200
@@ -356,6 +356,9 @@ config NOT_COHERENT_CACHE
 	bool
 	depends on 4xx || 8xx || E200
 	default y
+
+source "drivers/perfctr/Kconfig"
+
 endmenu
 
 source "init/Kconfig"
diff -rupN linux-2.6.20/arch/powerpc/kernel/process.c linux-2.6.20.perfctr27/arch/powerpc/kernel/process.c
--- linux-2.6.20/arch/powerpc/kernel/process.c	2007-09-28 09:08:22.000000000 +0200
+++ linux-2.6.20.perfctr27/arch/powerpc/kernel/process.c	2007-09-28 09:33:35.000000000 +0200
@@ -31,6 +31,7 @@
 #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>
 #include <linux/utsname.h>
@@ -332,7 +333,9 @@ struct task_struct *__switch_to(struct t
 	account_process_vtime(current);
 	calculate_steal_time();
 
+	perfctr_suspend_thread(&prev->thread);
 	last = _switch(old_thread, new_thread);
+	perfctr_resume_thread(&current->thread);
 
 	local_irq_restore(flags);
 
@@ -458,6 +461,7 @@ void show_regs(struct pt_regs * regs)
 void exit_thread(void)
 {
 	discard_lazy_cpu_state();
+	perfctr_exit_thread(&current->thread);
 }
 
 void flush_thread(void)
@@ -570,6 +574,8 @@ int copy_thread(int nr, unsigned long cl
 	p->thread.last_syscall = -1;
 #endif
 
+	perfctr_copy_task(p, regs);
+
 	return 0;
 }
 
diff -rupN linux-2.6.20/arch/x86_64/Kconfig linux-2.6.20.perfctr27/arch/x86_64/Kconfig
--- linux-2.6.20/arch/x86_64/Kconfig	2007-09-28 09:30:15.000000000 +0200
+++ linux-2.6.20.perfctr27/arch/x86_64/Kconfig	2007-09-28 09:33:35.000000000 +0200
@@ -607,6 +607,8 @@ config CC_STACKPROTECTOR_ALL
 	  functions that use large-ish on-stack buffers. By enabling
 	  this option, GCC will be asked to do this for ALL functions.
 
+source "drivers/perfctr/Kconfig"
+
 source kernel/Kconfig.hz
 
 config REORDER
diff -rupN linux-2.6.20/arch/x86_64/ia32/ia32entry.S linux-2.6.20.perfctr27/arch/x86_64/ia32/ia32entry.S
--- linux-2.6.20/arch/x86_64/ia32/ia32entry.S	2007-09-28 09:08:23.000000000 +0200
+++ linux-2.6.20.perfctr27/arch/x86_64/ia32/ia32entry.S	2007-09-28 09:33:35.000000000 +0200
@@ -718,4 +718,14 @@ ia32_sys_call_table:
 	.quad compat_sys_vmsplice
 	.quad compat_sys_move_pages
 	.quad sys_getcpu
+	.quad quiet_ni_syscall
+	.quad quiet_ni_syscall		/* 320 */
+	.quad quiet_ni_syscall
+	.quad quiet_ni_syscall
+	.quad quiet_ni_syscall
+	.quad quiet_ni_syscall
+	.quad sys_vperfctr_open		/* 325 */
+	.quad sys_vperfctr_control
+	.quad sys_vperfctr_write
+	.quad sys_vperfctr_read
 ia32_syscall_end:		
diff -rupN linux-2.6.20/arch/x86_64/kernel/entry.S linux-2.6.20.perfctr27/arch/x86_64/kernel/entry.S
--- linux-2.6.20/arch/x86_64/kernel/entry.S	2007-09-28 09:30:15.000000000 +0200
+++ linux-2.6.20.perfctr27/arch/x86_64/kernel/entry.S	2007-09-28 09:33:35.000000000 +0200
@@ -689,6 +689,12 @@ ENTRY(spurious_interrupt)
 	apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt
 END(spurious_interrupt)
 				
+#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_PERFCTR)
+ENTRY(perfctr_interrupt)
+	apicinterrupt LOCAL_PERFCTR_VECTOR,smp_perfctr_interrupt
+END(perfctr_interrupt)
+#endif
+
 /*
  * Exception entry points.
  */ 		
diff -rupN linux-2.6.20/arch/x86_64/kernel/i8259.c linux-2.6.20.perfctr27/arch/x86_64/kernel/i8259.c
--- linux-2.6.20/arch/x86_64/kernel/i8259.c	2007-09-28 09:30:15.000000000 +0200
+++ linux-2.6.20.perfctr27/arch/x86_64/kernel/i8259.c	2007-09-28 09:33:35.000000000 +0200
@@ -22,6 +22,7 @@
 #include <asm/delay.h>
 #include <asm/desc.h>
 #include <asm/apic.h>
+#include <asm/perfctr.h>
 
 /*
  * Common place to define all x86 IRQ vectors
@@ -553,6 +554,8 @@ void __init init_IRQ(void)
 	set_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
 	set_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
 
+	perfctr_vector_init();
+
 	/*
 	 * Set the clock to HZ Hz, we already have a valid
 	 * vector now:
diff -rupN linux-2.6.20/arch/x86_64/kernel/process.c linux-2.6.20.perfctr27/arch/x86_64/kernel/process.c
--- linux-2.6.20/arch/x86_64/kernel/process.c	2007-09-28 09:30:15.000000000 +0200
+++ linux-2.6.20.perfctr27/arch/x86_64/kernel/process.c	2007-09-28 09:33:35.000000000 +0200
@@ -32,6 +32,7 @@
 #include <linux/interrupt.h>
 #include <linux/delay.h>
 #include <linux/ptrace.h>
+#include <linux/perfctr.h>
 #include <linux/utsname.h>
 #include <linux/random.h>
 #include <linux/notifier.h>
@@ -377,6 +378,7 @@ void exit_thread(void)
 		t->io_bitmap_max = 0;
 		put_cpu();
 	}
+	perfctr_exit_thread(t);
 }
 
 void flush_thread(void)
@@ -482,6 +484,8 @@ 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(test_tsk_thread_flag(me, TIF_IO_BITMAP))) {
 		p->thread.io_bitmap_ptr = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
 		if (!p->thread.io_bitmap_ptr) {
@@ -665,6 +669,9 @@ __switch_to(struct task_struct *prev_p, 
 	 */
 	if (next_p->fpu_counter>5)
 		math_state_restore();
+
+	perfctr_resume_thread(next);
+
 	return prev_p;
 }
 
diff -rupN linux-2.6.20/drivers/Makefile linux-2.6.20.perfctr27/drivers/Makefile
--- linux-2.6.20/drivers/Makefile	2007-09-28 09:30:15.000000000 +0200
+++ linux-2.6.20.perfctr27/drivers/Makefile	2007-09-28 09:33:35.000000000 +0200
@@ -73,6 +73,7 @@ obj-$(CONFIG_NEW_LEDS)		+= leds/
 obj-$(CONFIG_INFINIBAND)	+= infiniband/
 obj-$(CONFIG_IPATH_CORE)	+= infiniband/
 obj-$(CONFIG_SGI_SN)		+= sn/
+obj-$(CONFIG_PERFCTR)		+= perfctr/
 obj-y				+= firmware/
 obj-$(CONFIG_CRYPTO)		+= crypto/
 obj-$(CONFIG_SUPERH)		+= sh/
diff -rupN linux-2.6.20/include/asm-i386/mach-default/irq_vectors.h linux-2.6.20.perfctr27/include/asm-i386/mach-default/irq_vectors.h
--- linux-2.6.20/include/asm-i386/mach-default/irq_vectors.h	2007-02-04 19:44:54.000000000 +0100
+++ linux-2.6.20.perfctr27/include/asm-i386/mach-default/irq_vectors.h	2007-09-28 09:33:35.000000000 +0200
@@ -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-2.6.20/include/asm-i386/mach-visws/irq_vectors.h linux-2.6.20.perfctr27/include/asm-i386/mach-visws/irq_vectors.h
--- linux-2.6.20/include/asm-i386/mach-visws/irq_vectors.h	2007-02-04 19:44:54.000000000 +0100
+++ linux-2.6.20.perfctr27/include/asm-i386/mach-visws/irq_vectors.h	2007-09-28 09:33:35.000000000 +0200
@@ -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-2.6.20/include/asm-i386/processor.h linux-2.6.20.perfctr27/include/asm-i386/processor.h
--- linux-2.6.20/include/asm-i386/processor.h	2007-09-28 09:30:24.000000000 +0200
+++ linux-2.6.20.perfctr27/include/asm-i386/processor.h	2007-09-28 09:33:35.000000000 +0200
@@ -418,6 +418,8 @@ 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-2.6.20/include/asm-i386/system.h linux-2.6.20.perfctr27/include/asm-i386/system.h
--- linux-2.6.20/include/asm-i386/system.h	2007-09-28 09:30:24.000000000 +0200
+++ linux-2.6.20.perfctr27/include/asm-i386/system.h	2007-09-28 09:33:35.000000000 +0200
@@ -17,6 +17,7 @@ extern struct task_struct * FASTCALL(__s
  */
 #define switch_to(prev,next,last) do {					\
 	unsigned long esi,edi;						\
+	perfctr_suspend_thread(&(prev)->thread);			\
 	asm volatile("pushfl\n\t"		/* Save flags */	\
 		     "pushl %%ebp\n\t"					\
 		     "movl %%esp,%0\n\t"	/* save ESP */		\
diff -rupN linux-2.6.20/include/asm-i386/unistd.h linux-2.6.20.perfctr27/include/asm-i386/unistd.h
--- linux-2.6.20/include/asm-i386/unistd.h	2007-09-28 09:30:24.000000000 +0200
+++ linux-2.6.20.perfctr27/include/asm-i386/unistd.h	2007-09-28 09:36:03.000000000 +0200
@@ -325,10 +325,14 @@
 #define __NR_move_pages		317
 #define __NR_getcpu		318
 #define __NR_epoll_pwait	319
+#define __NR_vperfctr_open	325
+#define __NR_vperfctr_control	(__NR_vperfctr_open+1)
+#define __NR_vperfctr_write	(__NR_vperfctr_open+2)
+#define __NR_vperfctr_read	(__NR_vperfctr_open+3)
 
 #ifdef __KERNEL__
 
-#define NR_syscalls 320
+#define NR_syscalls 329
 
 #define __ARCH_WANT_IPC_PARSE_VERSION
 #define __ARCH_WANT_OLD_READDIR
diff -rupN linux-2.6.20/include/asm-powerpc/processor.h linux-2.6.20.perfctr27/include/asm-powerpc/processor.h
--- linux-2.6.20/include/asm-powerpc/processor.h	2007-09-28 09:30:24.000000000 +0200
+++ linux-2.6.20.perfctr27/include/asm-powerpc/processor.h	2007-09-28 09:33:35.000000000 +0200
@@ -166,6 +166,9 @@ 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-2.6.20/include/asm-powerpc/reg.h linux-2.6.20.perfctr27/include/asm-powerpc/reg.h
--- linux-2.6.20/include/asm-powerpc/reg.h	2007-09-28 09:30:24.000000000 +0200
+++ linux-2.6.20.perfctr27/include/asm-powerpc/reg.h	2007-09-28 09:33:35.000000000 +0200
@@ -367,10 +367,8 @@
 #define SPRN_PURR	0x135	/* Processor Utilization of Resources Reg */
 #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_ASR	0x118   /* Address Space 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 */
@@ -407,13 +405,6 @@
 #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 */
 
@@ -463,33 +454,7 @@
 #define SPRN_SDAR	781
 
 #else /* 32-bit */
-#define SPRN_MMCR0	952	/* Monitor Mode Control Register 0 */
-#define   MMCR0_FC	0x80000000UL /* freeze counters */
-#define   MMCR0_FCS	0x40000000UL /* freeze in supervisor state */
-#define   MMCR0_FCP	0x20000000UL /* freeze in problem state */
-#define   MMCR0_FCM1	0x10000000UL /* freeze counters while MSR mark = 1 */
-#define   MMCR0_FCM0	0x08000000UL /* freeze counters while MSR mark = 0 */
-#define   MMCR0_PMXE	0x04000000UL /* performance monitor exception enable */
-#define   MMCR0_FCECE	0x02000000UL /* freeze ctrs on enabled cond or event */
-#define   MMCR0_TBEE	0x00400000UL /* time base exception enable */
-#define   MMCR0_PMC1CE	0x00008000UL /* PMC1 count enable*/
 #define   MMCR0_PMCnCE	0x00004000UL /* count enable for all but PMC 1*/
-#define   MMCR0_TRIGGER	0x00002000UL /* TRIGGER enable */
-#define   MMCR0_PMC1SEL	0x00001fc0UL /* PMC 1 Event */
-#define   MMCR0_PMC2SEL	0x0000003fUL /* PMC 2 Event */
-
-#define SPRN_MMCR1	956
-#define   MMCR1_PMC3SEL	0xf8000000UL /* PMC 3 Event */
-#define   MMCR1_PMC4SEL	0x07c00000UL /* PMC 4 Event */
-#define   MMCR1_PMC5SEL	0x003e0000UL /* PMC 5 Event */
-#define   MMCR1_PMC6SEL 0x0001f800UL /* PMC 6 Event */
-#define SPRN_MMCR2	944
-#define SPRN_PMC1	953	/* Performance Counter Register 1 */
-#define SPRN_PMC2	954	/* Performance Counter Register 2 */
-#define SPRN_PMC3	957	/* Performance Counter Register 3 */
-#define SPRN_PMC4	958	/* Performance Counter Register 4 */
-#define SPRN_PMC5	945	/* Performance Counter Register 5 */
-#define SPRN_PMC6	946	/* Performance Counter Register 6 */
 
 #define SPRN_SIAR	955	/* Sampled Instruction Address Register */
 
@@ -501,6 +466,77 @@
 #define MMCR0_PMC2_CYCLES	0x1
 #define MMCR0_PMC2_ITLB		0x7
 #define MMCR0_PMC2_LOADMISSTIME	0x5
+
+/* 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		0x00001FC0 /* 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		0x07C00000 /* 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)
+
 #endif
 
 /*
diff -rupN linux-2.6.20/include/asm-powerpc/systbl.h linux-2.6.20.perfctr27/include/asm-powerpc/systbl.h
--- linux-2.6.20/include/asm-powerpc/systbl.h	2007-09-28 09:08:36.000000000 +0200
+++ linux-2.6.20.perfctr27/include/asm-powerpc/systbl.h	2007-09-28 09:33:35.000000000 +0200
@@ -304,4 +304,16 @@ SYSCALL_SPU(fchmodat)
 SYSCALL_SPU(faccessat)
 COMPAT_SYS_SPU(get_robust_list)
 COMPAT_SYS_SPU(set_robust_list)
-COMPAT_SYS(move_pages)
+COMPAT_SYS(move_pages)		/* 301 */
+SYSCALL(ni_syscall)		/* 302 */
+SYSCALL(ni_syscall)		/* 303 */
+SYSCALL(ni_syscall)		/* 304 */
+SYSCALL(ni_syscall)		/* 305 */
+SYSCALL(ni_syscall)		/* 306 */
+SYSCALL(ni_syscall)		/* 307 */
+SYSCALL(ni_syscall)		/* 308 */
+SYSCALL(ni_syscall)		/* 309 */
+SYSCALL(vperfctr_open)		/* 310 */
+SYSCALL(vperfctr_control)
+SYSCALL(vperfctr_write)
+SYSCALL(vperfctr_read)
diff -rupN linux-2.6.20/include/asm-powerpc/unistd.h linux-2.6.20.perfctr27/include/asm-powerpc/unistd.h
--- linux-2.6.20/include/asm-powerpc/unistd.h	2007-09-28 09:30:24.000000000 +0200
+++ linux-2.6.20.perfctr27/include/asm-powerpc/unistd.h	2007-09-28 09:33:35.000000000 +0200
@@ -324,10 +324,14 @@
 #define __NR_get_robust_list	299
 #define __NR_set_robust_list	300
 #define __NR_move_pages		301
+#define __NR_vperfctr_open	310
+#define __NR_vperfctr_control	(__NR_vperfctr_open+1)
+#define __NR_vperfctr_write	(__NR_vperfctr_open+2)
+#define __NR_vperfctr_read	(__NR_vperfctr_open+3)
 
 #ifdef __KERNEL__
 
-#define __NR_syscalls		302
+#define __NR_syscalls		314
 
 #define __NR__exit __NR_exit
 #define NR_syscalls	__NR_syscalls
diff -rupN linux-2.6.20/include/asm-x86_64/hw_irq.h linux-2.6.20.perfctr27/include/asm-x86_64/hw_irq.h
--- linux-2.6.20/include/asm-x86_64/hw_irq.h	2007-09-28 09:08:36.000000000 +0200
+++ linux-2.6.20.perfctr27/include/asm-x86_64/hw_irq.h	2007-09-28 09:33:35.000000000 +0200
@@ -63,14 +63,15 @@
  * 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   /* duplicated in irq.h */
+#define FIRST_SYSTEM_VECTOR	0xee   /* duplicated in irq.h */
 
 
 #ifndef __ASSEMBLY__
diff -rupN linux-2.6.20/include/asm-x86_64/irq.h linux-2.6.20.perfctr27/include/asm-x86_64/irq.h
--- linux-2.6.20/include/asm-x86_64/irq.h	2007-02-04 19:44:54.000000000 +0100
+++ linux-2.6.20.perfctr27/include/asm-x86_64/irq.h	2007-09-28 09:33:35.000000000 +0200
@@ -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 */
 
 #define NR_IRQS (NR_VECTORS + (32 *NR_CPUS))
 #define NR_IRQ_VECTORS NR_IRQS
diff -rupN linux-2.6.20/include/asm-x86_64/processor.h linux-2.6.20.perfctr27/include/asm-x86_64/processor.h
--- linux-2.6.20/include/asm-x86_64/processor.h	2007-09-28 09:30:24.000000000 +0200
+++ linux-2.6.20.perfctr27/include/asm-x86_64/processor.h	2007-09-28 09:33:35.000000000 +0200
@@ -274,6 +274,8 @@ 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-2.6.20/include/asm-x86_64/system.h linux-2.6.20.perfctr27/include/asm-x86_64/system.h
--- linux-2.6.20/include/asm-x86_64/system.h	2007-09-28 09:07:41.000000000 +0200
+++ linux-2.6.20.perfctr27/include/asm-x86_64/system.h	2007-09-28 09:33:35.000000000 +0200
@@ -21,7 +21,8 @@
 	,"rcx","rbx","rdx","r8","r9","r10","r11","r12","r13","r14","r15"
 
 /* Save restore flags to clear handle leaking NT */
-#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 */	  \
@@ -41,7 +42,8 @@
 		       [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-2.6.20/include/asm-x86_64/unistd.h linux-2.6.20.perfctr27/include/asm-x86_64/unistd.h
--- linux-2.6.20/include/asm-x86_64/unistd.h	2007-09-28 09:30:24.000000000 +0200
+++ linux-2.6.20.perfctr27/include/asm-x86_64/unistd.h	2007-09-28 09:33:35.000000000 +0200
@@ -619,8 +619,22 @@ __SYSCALL(__NR_sync_file_range, sys_sync
 __SYSCALL(__NR_vmsplice, sys_vmsplice)
 #define __NR_move_pages		279
 __SYSCALL(__NR_move_pages, sys_move_pages)
+__SYSCALL(280, sys_ni_syscall)	/* utimensat */
+__SYSCALL(281, sys_ni_syscall)	/* epoll_wait */
+__SYSCALL(282, sys_ni_syscall)	/* signalfd */
+__SYSCALL(283, sys_ni_syscall)	/* timerfd */
+__SYSCALL(284, sys_ni_syscall)	/* eventfd */
+__SYSCALL(285, sys_ni_syscall)	/* fallocate */
+#define __NR_vperfctr_open	286
+__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_move_pages
+#define __NR_syscall_max __NR_vperfctr_read
 
 #ifndef __NO_STUBS
 #define __ARCH_WANT_OLD_READDIR
diff -rupN linux-2.6.20/include/linux/sched.h linux-2.6.20.perfctr27/include/linux/sched.h
--- linux-2.6.20/include/linux/sched.h	2007-09-28 09:30:24.000000000 +0200
+++ linux-2.6.20.perfctr27/include/linux/sched.h	2007-09-28 09:33:35.000000000 +0200
@@ -1470,6 +1470,9 @@ static inline int thread_group_empty(str
  * subscriptions and synchronises with wait4().  Also used in procfs.  Also
  * pins the final release of task.io_context.  Also protects ->cpuset.
  *
+ * 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-2.6.20/kernel/exit.c linux-2.6.20.perfctr27/kernel/exit.c
--- linux-2.6.20/kernel/exit.c	2007-09-28 09:30:24.000000000 +0200
+++ linux-2.6.20.perfctr27/kernel/exit.c	2007-09-28 09:33:35.000000000 +0200
@@ -28,6 +28,7 @@
 #include <linux/mount.h>
 #include <linux/proc_fs.h>
 #include <linux/mempolicy.h>
+#include <linux/perfctr.h>
 #include <linux/taskstats_kern.h>
 #include <linux/delayacct.h>
 #include <linux/cpuset.h>
@@ -170,6 +171,7 @@ repeat:
 		zap_leader = (leader->exit_signal == -1);
 	}
 
+	perfctr_release_task(p);
 	sched_exit(p);
 	write_unlock_irq(&tasklist_lock);
 	proc_flush_task(p);
diff -rupN linux-2.6.20/kernel/sched.c linux-2.6.20.perfctr27/kernel/sched.c
--- linux-2.6.20/kernel/sched.c	2007-09-28 09:30:24.000000000 +0200
+++ linux-2.6.20.perfctr27/kernel/sched.c	2007-09-28 09:33:35.000000000 +0200
@@ -45,6 +45,7 @@
 #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>
@@ -5005,6 +5006,8 @@ int set_cpus_allowed(struct task_struct 
 	struct rq *rq;
 	int ret = 0;
 
+	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-2.6.20/kernel/sys_ni.c linux-2.6.20.perfctr27/kernel/sys_ni.c
--- linux-2.6.20/kernel/sys_ni.c	2007-09-28 09:07:41.000000000 +0200
+++ linux-2.6.20.perfctr27/kernel/sys_ni.c	2007-09-28 09:33:35.000000000 +0200
@@ -73,6 +73,10 @@ 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-2.6.20/kernel/timer.c linux-2.6.20.perfctr27/kernel/timer.c
--- linux-2.6.20/kernel/timer.c	2007-09-28 09:30:24.000000000 +0200
+++ linux-2.6.20.perfctr27/kernel/timer.c	2007-09-28 09:33:35.000000000 +0200
@@ -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 <linux/delay.h>
 
@@ -1110,6 +1111,7 @@ 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);
