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

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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: Jamie Iles <jamie.iles@picochip.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Jamie Iles
2010-02-02 20:24:58 +01:00
committed by Russell King
parent 1618fdd960
commit 7ada189f5c
3 changed files with 40 additions and 0 deletions
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7
arch/arm/mm/fault.c
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@@ -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
*/