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Commit 7ada189f authored by Jamie Iles's avatar Jamie Iles Committed by Russell King
Browse files

ARM: 5900/2: arm: enable support for software perf events 



The perf events subsystem allows counting of both hardware and
software events. This patch implements the bare minimum for software
performance events.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: default avatarJamie Iles <jamie.iles@picochip.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 1618fdd9

arch/arm/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -18,6 +18,8 @@ config ARM 
	select HAVE_KRETPROBES if (HAVE_KPROBES)

	select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)

	select HAVE_GENERIC_DMA_COHERENT

	select HAVE_PERF_EVENTS

	select PERF_USE_VMALLOC

	help

	  The ARM series is a line of low-power-consumption RISC chip designs

	  licensed by ARM Ltd and targeted at embedded applications and

arch/arm/include/asm/perf_event.h

0 → 100644
+31 −0
Original line number Diff line number Diff line 
/*

 *  linux/arch/arm/include/asm/perf_event.h

 *

 *  Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 */



#ifndef __ARM_PERF_EVENT_H__

#define __ARM_PERF_EVENT_H__



/*

 * NOP: on *most* (read: all supported) ARM platforms, the performance

 * counter interrupts are regular interrupts and not an NMI. This

 * means that when we receive the interrupt we can call

 * perf_event_do_pending() that handles all of the work with

 * interrupts enabled.

 */

static inline void

set_perf_event_pending(void)

{

}



/* ARM performance counters start from 1 (in the cp15 accesses) so use the

 * same indexes here for consistency. */

#define PERF_EVENT_INDEX_OFFSET 1



#endif /* __ARM_PERF_EVENT_H__ */

arch/arm/mm/fault.c

+7 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/page-flags.h>

#include <linux/sched.h>

#include <linux/highmem.h>

#include <linux/perf_event.h>



#include <asm/system.h>

#include <asm/pgtable.h>
@@ -302,6 +303,12 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) 
	fault = __do_page_fault(mm, addr, fsr, tsk);

	up_read(&mm->mmap_sem);



	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, addr);

	if (fault & VM_FAULT_MAJOR)

		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, 0, regs, addr);

	else if (fault & VM_FAULT_MINOR)

		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, 0, regs, addr);



	/*

	 * Handle the "normal" case first - VM_FAULT_MAJOR / VM_FAULT_MINOR

	 */