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path: root/drivers/oprofile/oprof.c
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Diffstat (limited to 'drivers/oprofile/oprof.c')
-rw-r--r--drivers/oprofile/oprof.c32
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;