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Diffstat (limited to 'mm/vmalloc.c')
-rw-r--r--mm/vmalloc.c95
1 files changed, 55 insertions, 40 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index a5bbdd3b5d67..2faaa2976447 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -765,7 +765,7 @@ struct vmap_block {
spinlock_t lock;
struct vmap_area *va;
unsigned long free, dirty;
- DECLARE_BITMAP(dirty_map, VMAP_BBMAP_BITS);
+ unsigned long dirty_min, dirty_max; /*< dirty range */
struct list_head free_list;
struct rcu_head rcu_head;
struct list_head purge;
@@ -796,13 +796,31 @@ static unsigned long addr_to_vb_idx(unsigned long addr)
return addr;
}
-static struct vmap_block *new_vmap_block(gfp_t gfp_mask)
+static void *vmap_block_vaddr(unsigned long va_start, unsigned long pages_off)
+{
+ unsigned long addr;
+
+ addr = va_start + (pages_off << PAGE_SHIFT);
+ BUG_ON(addr_to_vb_idx(addr) != addr_to_vb_idx(va_start));
+ return (void *)addr;
+}
+
+/**
+ * new_vmap_block - allocates new vmap_block and occupies 2^order pages in this
+ * block. Of course pages number can't exceed VMAP_BBMAP_BITS
+ * @order: how many 2^order pages should be occupied in newly allocated block
+ * @gfp_mask: flags for the page level allocator
+ *
+ * Returns: virtual address in a newly allocated block or ERR_PTR(-errno)
+ */
+static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
{
struct vmap_block_queue *vbq;
struct vmap_block *vb;
struct vmap_area *va;
unsigned long vb_idx;
int node, err;
+ void *vaddr;
node = numa_node_id();
@@ -826,11 +844,15 @@ static struct vmap_block *new_vmap_block(gfp_t gfp_mask)
return ERR_PTR(err);
}
+ vaddr = vmap_block_vaddr(va->va_start, 0);
spin_lock_init(&vb->lock);
vb->va = va;
- vb->free = VMAP_BBMAP_BITS;
+ /* At least something should be left free */
+ BUG_ON(VMAP_BBMAP_BITS <= (1UL << order));
+ vb->free = VMAP_BBMAP_BITS - (1UL << order);
vb->dirty = 0;
- bitmap_zero(vb->dirty_map, VMAP_BBMAP_BITS);
+ vb->dirty_min = VMAP_BBMAP_BITS;
+ vb->dirty_max = 0;
INIT_LIST_HEAD(&vb->free_list);
vb_idx = addr_to_vb_idx(va->va_start);
@@ -842,11 +864,11 @@ static struct vmap_block *new_vmap_block(gfp_t gfp_mask)
vbq = &get_cpu_var(vmap_block_queue);
spin_lock(&vbq->lock);
- list_add_rcu(&vb->free_list, &vbq->free);
+ list_add_tail_rcu(&vb->free_list, &vbq->free);
spin_unlock(&vbq->lock);
put_cpu_var(vmap_block_queue);
- return vb;
+ return vaddr;
}
static void free_vmap_block(struct vmap_block *vb)
@@ -881,7 +903,8 @@ static void purge_fragmented_blocks(int cpu)
if (vb->free + vb->dirty == VMAP_BBMAP_BITS && vb->dirty != VMAP_BBMAP_BITS) {
vb->free = 0; /* prevent further allocs after releasing lock */
vb->dirty = VMAP_BBMAP_BITS; /* prevent purging it again */
- bitmap_fill(vb->dirty_map, VMAP_BBMAP_BITS);
+ vb->dirty_min = 0;
+ vb->dirty_max = VMAP_BBMAP_BITS;
spin_lock(&vbq->lock);
list_del_rcu(&vb->free_list);
spin_unlock(&vbq->lock);
@@ -910,7 +933,7 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
{
struct vmap_block_queue *vbq;
struct vmap_block *vb;
- unsigned long addr = 0;
+ void *vaddr = NULL;
unsigned int order;
BUG_ON(size & ~PAGE_MASK);
@@ -925,43 +948,38 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
}
order = get_order(size);
-again:
rcu_read_lock();
vbq = &get_cpu_var(vmap_block_queue);
list_for_each_entry_rcu(vb, &vbq->free, free_list) {
- int i;
+ unsigned long pages_off;
spin_lock(&vb->lock);
- if (vb->free < 1UL << order)
- goto next;
+ if (vb->free < (1UL << order)) {
+ spin_unlock(&vb->lock);
+ continue;
+ }
- i = VMAP_BBMAP_BITS - vb->free;
- addr = vb->va->va_start + (i << PAGE_SHIFT);
- BUG_ON(addr_to_vb_idx(addr) !=
- addr_to_vb_idx(vb->va->va_start));
+ pages_off = VMAP_BBMAP_BITS - vb->free;
+ vaddr = vmap_block_vaddr(vb->va->va_start, pages_off);
vb->free -= 1UL << order;
if (vb->free == 0) {
spin_lock(&vbq->lock);
list_del_rcu(&vb->free_list);
spin_unlock(&vbq->lock);
}
+
spin_unlock(&vb->lock);
break;
-next:
- spin_unlock(&vb->lock);
}
put_cpu_var(vmap_block_queue);
rcu_read_unlock();
- if (!addr) {
- vb = new_vmap_block(gfp_mask);
- if (IS_ERR(vb))
- return vb;
- goto again;
- }
+ /* Allocate new block if nothing was found */
+ if (!vaddr)
+ vaddr = new_vmap_block(order, gfp_mask);
- return (void *)addr;
+ return vaddr;
}
static void vb_free(const void *addr, unsigned long size)
@@ -979,6 +997,7 @@ static void vb_free(const void *addr, unsigned long size)
order = get_order(size);
offset = (unsigned long)addr & (VMAP_BLOCK_SIZE - 1);
+ offset >>= PAGE_SHIFT;
vb_idx = addr_to_vb_idx((unsigned long)addr);
rcu_read_lock();
@@ -989,7 +1008,10 @@ static void vb_free(const void *addr, unsigned long size)
vunmap_page_range((unsigned long)addr, (unsigned long)addr + size);
spin_lock(&vb->lock);
- BUG_ON(bitmap_allocate_region(vb->dirty_map, offset >> PAGE_SHIFT, order));
+
+ /* Expand dirty range */
+ vb->dirty_min = min(vb->dirty_min, offset);
+ vb->dirty_max = max(vb->dirty_max, offset + (1UL << order));
vb->dirty += 1UL << order;
if (vb->dirty == VMAP_BBMAP_BITS) {
@@ -1028,25 +1050,18 @@ void vm_unmap_aliases(void)
rcu_read_lock();
list_for_each_entry_rcu(vb, &vbq->free, free_list) {
- int i, j;
-
spin_lock(&vb->lock);
- i = find_first_bit(vb->dirty_map, VMAP_BBMAP_BITS);
- if (i < VMAP_BBMAP_BITS) {
+ if (vb->dirty) {
+ unsigned long va_start = vb->va->va_start;
unsigned long s, e;
- j = find_last_bit(vb->dirty_map,
- VMAP_BBMAP_BITS);
- j = j + 1; /* need exclusive index */
+ s = va_start + (vb->dirty_min << PAGE_SHIFT);
+ e = va_start + (vb->dirty_max << PAGE_SHIFT);
- s = vb->va->va_start + (i << PAGE_SHIFT);
- e = vb->va->va_start + (j << PAGE_SHIFT);
- flush = 1;
+ start = min(s, start);
+ end = max(e, end);
- if (s < start)
- start = s;
- if (e > end)
- end = e;
+ flush = 1;
}
spin_unlock(&vb->lock);
}
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-23 18:08:48 +0300