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authorThomas Gleixner <tglx@linutronix.de>2012-05-05 15:05:41 +0000
committerThomas Gleixner <tglx@linutronix.de>2012-05-08 14:08:44 +0200
commit0d15d74a1ead10673b5b1db66d4c90552769096c (patch)
treed8eadc48f0aa1ec04172a66b2bcf78d3cb7a0ba1 /kernel
parent67ba5293f705eb1d1b98710e5ccb0f615936a6fc (diff)
downloadlinux-0d15d74a1ead10673b5b1db66d4c90552769096c.tar.gz
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
Diffstat (limited to 'kernel')
-rw-r--r--kernel/fork.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 2dfad026967..7590bd6e8df 100644
--- 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) */