diff options
Diffstat (limited to 'drivers/oprofile/oprof.c')
| -rw-r--r-- | drivers/oprofile/oprof.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/oprofile/oprof.c b/drivers/oprofile/oprof.c index f9bda64fcd1b..43b01daa91e1 100644 --- a/drivers/oprofile/oprof.c +++ b/drivers/oprofile/oprof.c @@ -239,6 +239,38 @@ int oprofile_set_ulong(unsigned long *addr, unsigned long val) return err; } +#ifdef CONFIG_HAVE_HWSAMPLER +int oprofile_set_hwsampler(unsigned long val) +{ + int err = 0; + + mutex_lock(&start_mutex); + + if (oprofile_started) { + err = -EBUSY; + goto out; + } + + switch (val) { + case 1: + /* Switch to hardware sampling. */ + __oprofile_timer_exit(); + err = oprofile_arch_set_hwsampler(&oprofile_ops); + break; + case 0: + printk(KERN_INFO "oprofile: using timer interrupt.\n"); + err = __oprofile_timer_init(&oprofile_ops); + break; + default: + err = -EINVAL; + } + +out: + mutex_unlock(&start_mutex); + return err; +} +#endif /* CONFIG_HAVE_HWSAMPLER */ + static int __init oprofile_init(void) { int err; |