PM / Sleep: User space wakeup sources garbage collector Kconfig option
Rafael J. Wysocki [Sat, 5 May 2012 19:57:28 +0000 (21:57 +0200)]
Make it possible to configure out the user space wakeup sources
garbage collector for debugging and default Android builds.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Arve Hjønnevåg <arve@android.com>

kernel/power/Kconfig
kernel/power/wakelock.c

index d13d0f2..8ff5d51 100644 (file)
@@ -133,6 +133,11 @@ 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
index dc34b9d..c8fba33 100644 (file)
 #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);