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| author | Thomas Gleixner <tglx@linutronix.de> | 2012-05-05 19:05:41 +0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2012-05-08 16:08:44 +0400 |
| commit | 0d15d74a1ead10673b5b1db66d4c90552769096c (patch) | |
| tree | d8eadc48f0aa1ec04172a66b2bcf78d3cb7a0ba1 /kernel/fork.c | |
| parent | 67ba5293f705eb1d1b98710e5ccb0f615936a6fc (diff) | |
| download | linux-0d15d74a1ead10673b5b1db66d4c90552769096c.tar.xz | |
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/fork.c')
| -rw-r--r-- | kernel/fork.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 2dfad0269674..7590bd6e8dff 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) */ |