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