diff options
| -rw-r--r-- | kernel/power/Kconfig | 5 | ||||
| -rw-r--r-- | kernel/power/wakelock.c | 101 |
2 files changed, 67 insertions, 39 deletions
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig index 08783eda9ce..8f9b4eb974e 100644 --- a/kernel/power/Kconfig +++ b/kernel/power/Kconfig @@ -125,6 +125,11 @@ config PM_WAKELOCKS_LIMIT default 100 depends on PM_WAKELOCKS +config PM_WAKELOCKS_GC + bool "Garbage collector for user space wakeup sources" + depends on PM_WAKELOCKS + default y + config PM_RUNTIME bool "Run-time PM core functionality" depends on !IA64_HP_SIM diff --git a/kernel/power/wakelock.c b/kernel/power/wakelock.c index dc34b9d3b7d..c8fba338007 100644 --- a/kernel/power/wakelock.c +++ b/kernel/power/wakelock.c @@ -17,21 +17,18 @@ #include <linux/rbtree.h> #include <linux/slab.h> -#define WL_GC_COUNT_MAX 100 -#define WL_GC_TIME_SEC 300 - static DEFINE_MUTEX(wakelocks_lock); struct wakelock { char *name; struct rb_node node; struct wakeup_source ws; +#ifdef CONFIG_PM_WAKELOCKS_GC struct list_head lru; +#endif }; static struct rb_root wakelocks_tree = RB_ROOT; -static LIST_HEAD(wakelocks_lru_list); -static unsigned int wakelocks_gc_count; ssize_t pm_show_wakelocks(char *buf, bool show_active) { @@ -79,6 +76,61 @@ static inline void increment_wakelocks_number(void) {} static inline void decrement_wakelocks_number(void) {} #endif /* CONFIG_PM_WAKELOCKS_LIMIT */ +#ifdef CONFIG_PM_WAKELOCKS_GC +#define WL_GC_COUNT_MAX 100 +#define WL_GC_TIME_SEC 300 + +static LIST_HEAD(wakelocks_lru_list); +static unsigned int wakelocks_gc_count; + +static inline void wakelocks_lru_add(struct wakelock *wl) +{ + list_add(&wl->lru, &wakelocks_lru_list); +} + +static inline void wakelocks_lru_most_recent(struct wakelock *wl) +{ + list_move(&wl->lru, &wakelocks_lru_list); +} + +static void wakelocks_gc(void) +{ + struct wakelock *wl, *aux; + ktime_t now; + + if (++wakelocks_gc_count <= WL_GC_COUNT_MAX) + return; + + now = ktime_get(); + list_for_each_entry_safe_reverse(wl, aux, &wakelocks_lru_list, lru) { + u64 idle_time_ns; + bool active; + + spin_lock_irq(&wl->ws.lock); + idle_time_ns = ktime_to_ns(ktime_sub(now, wl->ws.last_time)); + active = wl->ws.active; + spin_unlock_irq(&wl->ws.lock); + + if (idle_time_ns < ((u64)WL_GC_TIME_SEC * NSEC_PER_SEC)) + break; + + if (!active) { + wakeup_source_remove(&wl->ws); + rb_erase(&wl->node, &wakelocks_tree); + list_del(&wl->lru); + kfree(wl->name); + kfree(wl); + decrement_wakelocks_number(); + } + } + wakelocks_gc_count = 0; +} +#else /* !CONFIG_PM_WAKELOCKS_GC */ +static inline void wakelocks_lru_add(struct wakelock *wl) {} +static inline void wakelocks_lru_most_recent(struct wakelock *wl) {} +static inline void wakelocks_gc(void) {} +#endif /* !CONFIG_PM_WAKELOCKS_GC */ + static struct wakelock *wakelock_lookup_add(const char *name, size_t len, bool add_if_not_found) { @@ -123,7 +175,7 @@ static struct wakelock *wakelock_lookup_add(const char *name, size_t len, wakeup_source_add(&wl->ws); rb_link_node(&wl->node, parent, node); rb_insert_color(&wl->node, &wakelocks_tree); - list_add(&wl->lru, &wakelocks_lru_list); + wakelocks_lru_add(wl); increment_wakelocks_number(); return wl; } @@ -166,42 +218,13 @@ int pm_wake_lock(const char *buf) __pm_stay_awake(&wl->ws); } - list_move(&wl->lru, &wakelocks_lru_list); + wakelocks_lru_most_recent(wl); out: mutex_unlock(&wakelocks_lock); return ret; } -static void wakelocks_gc(void) -{ - struct wakelock *wl, *aux; - ktime_t now = ktime_get(); - - list_for_each_entry_safe_reverse(wl, aux, &wakelocks_lru_list, lru) { - u64 idle_time_ns; - bool active; - - spin_lock_irq(&wl->ws.lock); - idle_time_ns = ktime_to_ns(ktime_sub(now, wl->ws.last_time)); - active = wl->ws.active; - spin_unlock_irq(&wl->ws.lock); - - if (idle_time_ns < ((u64)WL_GC_TIME_SEC * NSEC_PER_SEC)) - break; - - if (!active) { - wakeup_source_remove(&wl->ws); - rb_erase(&wl->node, &wakelocks_tree); - list_del(&wl->lru); - kfree(wl->name); - kfree(wl); - decrement_wakelocks_number(); - } - } - wakelocks_gc_count = 0; -} - int pm_wake_unlock(const char *buf) { struct wakelock *wl; @@ -226,9 +249,9 @@ int pm_wake_unlock(const char *buf) goto out; } __pm_relax(&wl->ws); - list_move(&wl->lru, &wakelocks_lru_list); - if (++wakelocks_gc_count > WL_GC_COUNT_MAX) - wakelocks_gc(); + + wakelocks_lru_most_recent(wl); + wakelocks_gc(); out: mutex_unlock(&wakelocks_lock); |