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Commit 0d15d74a authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

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: default avatarThomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20120505150141.491002124@linutronix.de
parent 67ba5293

kernel/fork.c

+27 −0
Original line number Diff line number Diff line
@@ -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) */