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linux-next/arch/x86/oprofile/init.c
Robert Richter dcfce4a095 oprofile, x86: Reimplement nmi timer mode using perf event
The legacy x86 nmi watchdog code was removed with the implementation
of the perf based nmi watchdog. This broke Oprofile's nmi timer
mode. To run nmi timer mode we relied on a continuous ticking nmi
source which the nmi watchdog provided. The nmi tick was no longer
available and current watchdog can not be used anymore since it runs
with very long periods in the range of seconds. This patch
reimplements the nmi timer mode using a perf counter nmi source.

V2:
* removing pr_info()
* fix undefined reference to `__udivdi3' for 32 bit build
* fix section mismatch of .cpuinit.data:nmi_timer_cpu_nb
* removed nmi timer setup in arch/x86
* implemented function stubs for op_nmi_init/exit()
* made code more readable in oprofile_init()

V3:
* fix architectural initialization in oprofile_init()
* fix CONFIG_OPROFILE_NMI_TIMER dependencies

Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Robert Richter <robert.richter@amd.com>
2011-11-04 16:27:18 +01:00

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C

/**
* @file init.c
*
* @remark Copyright 2002 OProfile authors
* @remark Read the file COPYING
*
* @author John Levon <levon@movementarian.org>
*/
#include <linux/oprofile.h>
#include <linux/init.h>
#include <linux/errno.h>
/*
* We support CPUs that have performance counters like the Pentium Pro
* with the NMI mode driver.
*/
#ifdef CONFIG_X86_LOCAL_APIC
extern int op_nmi_init(struct oprofile_operations *ops);
extern void op_nmi_exit(void);
#else
static int op_nmi_init(struct oprofile_operations *ops) { return -ENODEV; }
static void op_nmi_exit(void) { }
#endif
extern void x86_backtrace(struct pt_regs * const regs, unsigned int depth);
int __init oprofile_arch_init(struct oprofile_operations *ops)
{
ops->backtrace = x86_backtrace;
return op_nmi_init(ops);
}
void oprofile_arch_exit(void)
{
op_nmi_exit();
}