diff options
author | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 09:16:55 (GMT) |
---|---|---|
committer | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 09:16:55 (GMT) |
commit | ff4395654dc6a3a5e35611940047114d4f3d0a7a (patch) | |
tree | 1f17f5160046496c29afeb2872153dcbb939b8a0 /arch/x86/oprofile/nmi_timer_int.c | |
parent | 9402e12b8fef1efe9cf949fc020dcda22d9d8667 (diff) | |
download | linux-ff4395654dc6a3a5e35611940047114d4f3d0a7a.tar.xz |
i386: move oprofile
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/oprofile/nmi_timer_int.c')
-rw-r--r-- | arch/x86/oprofile/nmi_timer_int.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/arch/x86/oprofile/nmi_timer_int.c b/arch/x86/oprofile/nmi_timer_int.c new file mode 100644 index 0000000..1418e36 --- /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 <zwane@linuxpower.ca> + */ + +#include <linux/init.h> +#include <linux/smp.h> +#include <linux/errno.h> +#include <linux/oprofile.h> +#include <linux/rcupdate.h> +#include <linux/kdebug.h> + +#include <asm/nmi.h> +#include <asm/apic.h> +#include <asm/ptrace.h> + +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; +} |