diff options
Diffstat (limited to 'kernel/locking/lock_events.c')
| -rw-r--r-- | kernel/locking/lock_events.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/kernel/locking/lock_events.c b/kernel/locking/lock_events.c index 71c36d1fb834..fa2c2f951c6b 100644 --- a/kernel/locking/lock_events.c +++ b/kernel/locking/lock_events.c @@ -115,6 +115,29 @@ static const struct file_operations fops_lockevent = { .llseek = default_llseek, }; +#ifdef CONFIG_PARAVIRT_SPINLOCKS +#include <asm/paravirt.h> + +static bool __init skip_lockevent(const char *name) +{ + static int pv_on __initdata = -1; + + if (pv_on < 0) + pv_on = !pv_is_native_spin_unlock(); + /* + * Skip PV qspinlock events on bare metal. + */ + if (!pv_on && !memcmp(name, "pv_", 3)) + return true; + return false; +} +#else +static inline bool skip_lockevent(const char *name) +{ + return false; +} +#endif + /* * Initialize debugfs for the locking event counts. */ @@ -133,10 +156,13 @@ static int __init init_lockevent_counts(void) * root is allowed to do the read/write to limit impact to system * performance. */ - for (i = 0; i < lockevent_num; i++) + for (i = 0; i < lockevent_num; i++) { + if (skip_lockevent(lockevent_names[i])) + continue; if (!debugfs_create_file(lockevent_names[i], 0400, d_counts, (void *)(long)i, &fops_lockevent)) goto fail_undo; + } if (!debugfs_create_file(lockevent_names[LOCKEVENT_reset_cnts], 0200, d_counts, (void *)(long)LOCKEVENT_reset_cnts, |