diff options
Diffstat (limited to 'arch/x86/xen/spinlock.c')
| -rw-r--r-- | arch/x86/xen/spinlock.c | 30 |
1 files changed, 27 insertions, 3 deletions
diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c index 0d8f3b2..e6061f2 100644 --- a/arch/x86/xen/spinlock.c +++ b/arch/x86/xen/spinlock.c @@ -23,6 +23,7 @@ static struct xen_spinlock_stats u32 taken_slow_nested; u32 taken_slow_pickup; u32 taken_slow_spurious; + u32 taken_slow_irqenable; u64 released; u32 released_slow; @@ -167,12 +168,13 @@ static inline void unspinning_lock(struct xen_spinlock *xl, struct xen_spinlock __get_cpu_var(lock_spinners) = prev; } -static noinline int xen_spin_lock_slow(struct raw_spinlock *lock) +static noinline int xen_spin_lock_slow(struct raw_spinlock *lock, bool irq_enable) { struct xen_spinlock *xl = (struct xen_spinlock *)lock; struct xen_spinlock *prev; int irq = __get_cpu_var(lock_kicker_irq); int ret; + unsigned long flags; /* If kicker interrupts not initialized yet, just spin */ if (irq == -1) @@ -181,6 +183,12 @@ static noinline int xen_spin_lock_slow(struct raw_spinlock *lock) /* announce we're spinning */ prev = spinning_lock(xl); + flags = __raw_local_save_flags(); + if (irq_enable) { + ADD_STATS(taken_slow_irqenable, 1); + raw_local_irq_enable(); + } + ADD_STATS(taken_slow, 1); ADD_STATS(taken_slow_nested, prev != NULL); @@ -220,11 +228,12 @@ static noinline int xen_spin_lock_slow(struct raw_spinlock *lock) kstat_this_cpu.irqs[irq]++; out: + raw_local_irq_restore(flags); unspinning_lock(xl, prev); return ret; } -static void xen_spin_lock(struct raw_spinlock *lock) +static inline void __xen_spin_lock(struct raw_spinlock *lock, bool irq_enable) { struct xen_spinlock *xl = (struct xen_spinlock *)lock; unsigned timeout; @@ -254,11 +263,23 @@ static void xen_spin_lock(struct raw_spinlock *lock) : "memory"); spin_time_accum_fast(start_spin_fast); - } while (unlikely(oldval != 0 && (TIMEOUT == ~0 || !xen_spin_lock_slow(lock)))); + + } while (unlikely(oldval != 0 && + (TIMEOUT == ~0 || !xen_spin_lock_slow(lock, irq_enable)))); spin_time_accum(start_spin); } +static void xen_spin_lock(struct raw_spinlock *lock) +{ + __xen_spin_lock(lock, false); +} + +static void xen_spin_lock_flags(struct raw_spinlock *lock, unsigned long flags) +{ + __xen_spin_lock(lock, !raw_irqs_disabled_flags(flags)); +} + static noinline void xen_spin_unlock_slow(struct xen_spinlock *xl) { int cpu; @@ -323,6 +344,7 @@ void __init xen_init_spinlocks(void) pv_lock_ops.spin_is_locked = xen_spin_is_locked; pv_lock_ops.spin_is_contended = xen_spin_is_contended; pv_lock_ops.spin_lock = xen_spin_lock; + pv_lock_ops.spin_lock_flags = xen_spin_lock_flags; pv_lock_ops.spin_trylock = xen_spin_trylock; pv_lock_ops.spin_unlock = xen_spin_unlock; } @@ -353,6 +375,8 @@ static int __init xen_spinlock_debugfs(void) &spinlock_stats.taken_slow_pickup); debugfs_create_u32("taken_slow_spurious", 0444, d_spin_debug, &spinlock_stats.taken_slow_spurious); + debugfs_create_u32("taken_slow_irqenable", 0444, d_spin_debug, + &spinlock_stats.taken_slow_irqenable); debugfs_create_u64("released", 0444, d_spin_debug, &spinlock_stats.released); debugfs_create_u32("released_slow", 0444, d_spin_debug, |