From ff4395654dc6a3a5e35611940047114d4f3d0a7a Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Thu, 11 Oct 2007 11:16:55 +0200 Subject: i386: move oprofile Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar --- arch/x86/oprofile/nmi_timer_int.c | 69 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 arch/x86/oprofile/nmi_timer_int.c (limited to 'arch/x86/oprofile/nmi_timer_int.c') diff --git a/arch/x86/oprofile/nmi_timer_int.c b/arch/x86/oprofile/nmi_timer_int.c new file mode 100644 index 000000000000..1418e36ae7ab --- /dev/null +++ b/arch/x86/oprofile/nmi_timer_int.c @@ -0,0 +1,69 @@ +/** + * @file nmi_timer_int.c + * + * @remark Copyright 2003 OProfile authors + * @remark Read the file COPYING + * + * @author Zwane Mwaikambo + */ + +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +static int profile_timer_exceptions_notify(struct notifier_block *self, + unsigned long val, void *data) +{ + struct die_args *args = (struct die_args *)data; + int ret = NOTIFY_DONE; + + switch(val) { + case DIE_NMI: + oprofile_add_sample(args->regs, 0); + ret = NOTIFY_STOP; + break; + default: + break; + } + return ret; +} + +static struct notifier_block profile_timer_exceptions_nb = { + .notifier_call = profile_timer_exceptions_notify, + .next = NULL, + .priority = 0 +}; + +static int timer_start(void) +{ + if (register_die_notifier(&profile_timer_exceptions_nb)) + return 1; + return 0; +} + + +static void timer_stop(void) +{ + unregister_die_notifier(&profile_timer_exceptions_nb); + synchronize_sched(); /* Allow already-started NMIs to complete. */ +} + + +int __init op_nmi_timer_init(struct oprofile_operations * ops) +{ + if ((nmi_watchdog != NMI_IO_APIC) || (atomic_read(&nmi_active) <= 0)) + return -ENODEV; + + ops->start = timer_start; + ops->stop = timer_stop; + ops->cpu_type = "timer"; + printk(KERN_INFO "oprofile: using NMI timer interrupt.\n"); + return 0; +} -- cgit v1.2.3