WorkStruct: Separate delayable and non-delayable events.

Separate delayable work items from non-delayable work items be splitting them
into a separate structure (delayed_work), which incorporates a work_struct and
the timer_list removed from work_struct.

The work_struct struct is huge, and this limits it's usefulness.  On a 64-bit
architecture it's nearly 100 bytes in size.  This reduces that by half for the
non-delayable type of event.

Signed-Off-By: David Howells <dhowells@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/mm/slab.c b/mm/slab.c
index 3c4a7e34eddc..a65bc5e992c3 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -753,7 +753,7 @@ int slab_is_available(void)
         return g_cpucache_up == FULL;
 }
 
-static DEFINE_PER_CPU(struct work_struct, reap_work);
+static DEFINE_PER_CPU(struct delayed_work, reap_work);
 
 static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep)
 {
@@ -916,16 +916,16 @@ static void next_reap_node(void)
  */
 static void __devinit start_cpu_timer(int cpu)
 {
-        struct work_struct *reap_work = &per_cpu(reap_work, cpu);
+        struct delayed_work *reap_work = &per_cpu(reap_work, cpu);
 
         /*
          * When this gets called from do_initcalls via cpucache_init(),
          * init_workqueues() has already run, so keventd will be setup
          * at that time.
          */
-        if (keventd_up() && reap_work->func == NULL) {
+        if (keventd_up() && reap_work->work.func == NULL) {
                 init_reap_node(cpu);
-                INIT_WORK(reap_work, cache_reap, NULL);
+                INIT_DELAYED_WORK(reap_work, cache_reap, NULL);
                 schedule_delayed_work_on(cpu, reap_work, HZ + 3 * cpu);
         }
 }