cfq-iosched: compact io_context radix_tree

Use small consequent indexes as radix tree keys instead of sparse cfqd address.

This change will reduce radix tree depth from 11 (6 for 32-bit hosts)
to 1 if host have <=64 disks under cfq control, or to 0 if there only one disk.
So, this patch save 10*560 bytes for each process (5*296 for 32-bit hosts)

For each cfqd allocate cic index from ida.
To unlink dead cic from tree without cfqd access store index into ->key.
(bit 0 -- dead mark, bits 1..30 -- index: ida produce id in range 0..2^31-1)

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 4076023..c72e5ac 100644 (file)
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -64,6 +64,9 @@ static DEFINE_PER_CPU(unsigned long, cfq_ioc_count);
 static struct completion *ioc_gone;
 static DEFINE_SPINLOCK(ioc_gone_lock);
 
+static DEFINE_SPINLOCK(cic_index_lock);
+static DEFINE_IDA(cic_index_ida);
+
 #define CFQ_PRIO_LISTS         IOPRIO_BE_NR
 #define cfq_class_idle(cfqq)   ((cfqq)->ioprio_class == IOPRIO_CLASS_IDLE)
 #define cfq_class_rt(cfqq)     ((cfqq)->ioprio_class == IOPRIO_CLASS_RT)
@@ -271,6 +274,7 @@ struct cfq_data {
        unsigned int cfq_latency;
        unsigned int cfq_group_isolation;
 
+       unsigned int cic_index;
        struct list_head cic_list;
 
        /*
@@ -431,10 +435,11 @@ static inline void cic_set_cfqq(struct cfq_io_context *cic,
 }
 
 #define CIC_DEAD_KEY   1ul
+#define CIC_DEAD_INDEX_SHIFT   1
 
 static inline void *cfqd_dead_key(struct cfq_data *cfqd)
 {
-       return (void *)((unsigned long) cfqd | CIC_DEAD_KEY);
+       return (void *)(cfqd->cic_index << CIC_DEAD_INDEX_SHIFT | CIC_DEAD_KEY);
 }
 
 static inline struct cfq_data *cic_to_cfqd(struct cfq_io_context *cic)
@@ -2532,7 +2537,7 @@ static void cic_free_func(struct io_context *ioc, struct cfq_io_context *cic)
        BUG_ON(!(dead_key & CIC_DEAD_KEY));
 
        spin_lock_irqsave(&ioc->lock, flags);
-       radix_tree_delete(&ioc->radix_root, dead_key & ~CIC_DEAD_KEY);
+       radix_tree_delete(&ioc->radix_root, dead_key >> CIC_DEAD_INDEX_SHIFT);
        hlist_del_rcu(&cic->cic_list);
        spin_unlock_irqrestore(&ioc->lock, flags);
 
@@ -2906,7 +2911,7 @@ cfq_drop_dead_cic(struct cfq_data *cfqd, struct io_context *ioc,
 
        BUG_ON(ioc->ioc_data == cic);
 
-       radix_tree_delete(&ioc->radix_root, (unsigned long) cfqd);
+       radix_tree_delete(&ioc->radix_root, cfqd->cic_index);
        hlist_del_rcu(&cic->cic_list);
        spin_unlock_irqrestore(&ioc->lock, flags);
 
@@ -2934,7 +2939,7 @@ cfq_cic_lookup(struct cfq_data *cfqd, struct io_context *ioc)
        }
 
        do {
-               cic = radix_tree_lookup(&ioc->radix_root, (unsigned long) cfqd);
+               cic = radix_tree_lookup(&ioc->radix_root, cfqd->cic_index);
                rcu_read_unlock();
                if (!cic)
                        break;
@@ -2971,7 +2976,7 @@ static int cfq_cic_link(struct cfq_data *cfqd, struct io_context *ioc,
 
                spin_lock_irqsave(&ioc->lock, flags);
                ret = radix_tree_insert(&ioc->radix_root,
-                                               (unsigned long) cfqd, cic);
+                                               cfqd->cic_index, cic);
                if (!ret)
                        hlist_add_head_rcu(&cic->cic_list, &ioc->cic_list);
                spin_unlock_irqrestore(&ioc->lock, flags);
@@ -3723,10 +3728,32 @@ static void cfq_exit_queue(struct elevator_queue *e)
 
        cfq_shutdown_timer_wq(cfqd);
 
+       spin_lock(&cic_index_lock);
+       ida_remove(&cic_index_ida, cfqd->cic_index);
+       spin_unlock(&cic_index_lock);
+
        /* Wait for cfqg->blkg->key accessors to exit their grace periods. */
        call_rcu(&cfqd->rcu, cfq_cfqd_free);
 }
 
+static int cfq_alloc_cic_index(void)
+{
+       int index, error;
+
+       do {
+               if (!ida_pre_get(&cic_index_ida, GFP_KERNEL))
+                       return -ENOMEM;
+
+               spin_lock(&cic_index_lock);
+               error = ida_get_new(&cic_index_ida, &index);
+               spin_unlock(&cic_index_lock);
+               if (error && error != -EAGAIN)
+                       return error;
+       } while (error);
+
+       return index;
+}
+
 static void *cfq_init_queue(struct request_queue *q)
 {
        struct cfq_data *cfqd;
@@ -3734,10 +3761,16 @@ static void *cfq_init_queue(struct request_queue *q)
        struct cfq_group *cfqg;
        struct cfq_rb_root *st;
 
+       i = cfq_alloc_cic_index();
+       if (i < 0)
+               return NULL;
+
        cfqd = kmalloc_node(sizeof(*cfqd), GFP_KERNEL | __GFP_ZERO, q->node);
        if (!cfqd)
                return NULL;
 
+       cfqd->cic_index = i;
+
        /* Init root service tree */
        cfqd->grp_service_tree = CFQ_RB_ROOT;
 
@@ -3999,6 +4032,7 @@ static void __exit cfq_exit(void)
         */
        if (elv_ioc_count_read(cfq_ioc_count))
                wait_for_completion(&all_gone);
+       ida_destroy(&cic_index_ida);
        cfq_slab_kill();
 }