fork: Provide kmemcache based thread_info allocator

Several architectures have their own kmemcache based thread allocator
because THREAD_SIZE is smaller than PAGE_SIZE. Add it to the core code
conditionally on THREAD_SIZE < PAGE_SIZE so the private copies can go.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20120505150141.491002124@linutronix.de

diff --git a/kernel/fork.c b/kernel/fork.c
index 2dfad02..7590bd6 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -132,6 +132,11 @@ static inline void free_task_struct(struct task_struct *tsk)
 
 void __weak arch_release_thread_info(struct thread_info *ti) { }
 
+/*
+ * Allocate pages if THREAD_SIZE is >= PAGE_SIZE, otherwise use a
+ * kmemcache based allocator.
+ */
+# if THREAD_SIZE >= PAGE_SIZE
 static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
                                                  int node)
 {
@@ -146,6 +151,28 @@ static inline void free_thread_info(struct thread_info *ti)
        arch_release_thread_info(ti);
        free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
 }
+# else
+static struct kmem_cache *thread_info_cache;
+
+static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
+                                                 int node)
+{
+       return kmem_cache_alloc_node(thread_info_cache, THREADINFO_GFP, node);
+}
+
+static void free_thread_info(struct thread_info *ti)
+{
+       arch_release_thread_info(ti);
+       kmem_cache_free(thread_info_cache, ti);
+}
+
+void thread_info_cache_init(void)
+{
+       thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
+                                             THREAD_SIZE, 0, NULL);
+       BUG_ON(thread_info_cache == NULL);
+}
+# endif
 #endif
 
 /* SLAB cache for signal_struct structures (tsk->signal) */