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-rw-r--r--drivers/base/memory.c42
-rw-r--r--drivers/base/node.c78
-rw-r--r--drivers/macintosh/smu.c2
-rw-r--r--drivers/staging/android/lowmemorykiller.c16
-rw-r--r--drivers/virtio/virtio_balloon.c151
5 files changed, 222 insertions, 67 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 86c88216a503..987604d56c83 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -70,6 +70,13 @@ void unregister_memory_isolate_notifier(struct notifier_block *nb)
}
EXPORT_SYMBOL(unregister_memory_isolate_notifier);
+static void memory_block_release(struct device *dev)
+{
+ struct memory_block *mem = container_of(dev, struct memory_block, dev);
+
+ kfree(mem);
+}
+
/*
* register_memory - Setup a sysfs device for a memory block
*/
@@ -80,6 +87,7 @@ int register_memory(struct memory_block *memory)
memory->dev.bus = &memory_subsys;
memory->dev.id = memory->start_section_nr / sections_per_block;
+ memory->dev.release = memory_block_release;
error = device_register(&memory->dev);
return error;
@@ -246,7 +254,7 @@ static bool pages_correctly_reserved(unsigned long start_pfn,
* OK to have direct references to sparsemem variables in here.
*/
static int
-memory_block_action(unsigned long phys_index, unsigned long action)
+memory_block_action(unsigned long phys_index, unsigned long action, int online_type)
{
unsigned long start_pfn;
unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
@@ -261,7 +269,7 @@ memory_block_action(unsigned long phys_index, unsigned long action)
if (!pages_correctly_reserved(start_pfn, nr_pages))
return -EBUSY;
- ret = online_pages(start_pfn, nr_pages);
+ ret = online_pages(start_pfn, nr_pages, online_type);
break;
case MEM_OFFLINE:
ret = offline_pages(start_pfn, nr_pages);
@@ -276,7 +284,8 @@ memory_block_action(unsigned long phys_index, unsigned long action)
}
static int __memory_block_change_state(struct memory_block *mem,
- unsigned long to_state, unsigned long from_state_req)
+ unsigned long to_state, unsigned long from_state_req,
+ int online_type)
{
int ret = 0;
@@ -288,7 +297,7 @@ static int __memory_block_change_state(struct memory_block *mem,
if (to_state == MEM_OFFLINE)
mem->state = MEM_GOING_OFFLINE;
- ret = memory_block_action(mem->start_section_nr, to_state);
+ ret = memory_block_action(mem->start_section_nr, to_state, online_type);
if (ret) {
mem->state = from_state_req;
@@ -311,12 +320,14 @@ out:
}
static int memory_block_change_state(struct memory_block *mem,
- unsigned long to_state, unsigned long from_state_req)
+ unsigned long to_state, unsigned long from_state_req,
+ int online_type)
{
int ret;
mutex_lock(&mem->state_mutex);
- ret = __memory_block_change_state(mem, to_state, from_state_req);
+ ret = __memory_block_change_state(mem, to_state, from_state_req,
+ online_type);
mutex_unlock(&mem->state_mutex);
return ret;
@@ -330,10 +341,18 @@ store_mem_state(struct device *dev,
mem = container_of(dev, struct memory_block, dev);
- if (!strncmp(buf, "online", min((int)count, 6)))
- ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);
- else if(!strncmp(buf, "offline", min((int)count, 7)))
- ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE);
+ if (!strncmp(buf, "online_kernel", min_t(int, count, 13)))
+ ret = memory_block_change_state(mem, MEM_ONLINE,
+ MEM_OFFLINE, ONLINE_KERNEL);
+ else if (!strncmp(buf, "online_movable", min_t(int, count, 14)))
+ ret = memory_block_change_state(mem, MEM_ONLINE,
+ MEM_OFFLINE, ONLINE_MOVABLE);
+ else if (!strncmp(buf, "online", min_t(int, count, 6)))
+ ret = memory_block_change_state(mem, MEM_ONLINE,
+ MEM_OFFLINE, ONLINE_KEEP);
+ else if(!strncmp(buf, "offline", min_t(int, count, 7)))
+ ret = memory_block_change_state(mem, MEM_OFFLINE,
+ MEM_ONLINE, -1);
if (ret)
return ret;
@@ -635,7 +654,6 @@ int remove_memory_block(unsigned long node_id, struct mem_section *section,
mem_remove_simple_file(mem, phys_device);
mem_remove_simple_file(mem, removable);
unregister_memory(mem);
- kfree(mem);
} else
kobject_put(&mem->dev.kobj);
@@ -669,7 +687,7 @@ int offline_memory_block(struct memory_block *mem)
mutex_lock(&mem->state_mutex);
if (mem->state != MEM_OFFLINE)
- ret = __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE);
+ ret = __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE, -1);
mutex_unlock(&mem->state_mutex);
return ret;
diff --git a/drivers/base/node.c b/drivers/base/node.c
index af1a177216f1..294e31626210 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -252,6 +252,24 @@ static inline void hugetlb_register_node(struct node *node) {}
static inline void hugetlb_unregister_node(struct node *node) {}
#endif
+static void node_device_release(struct device *dev)
+{
+ struct node *node = to_node(dev);
+
+#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
+ /*
+ * We schedule the work only when a memory section is
+ * onlined/offlined on this node. When we come here,
+ * all the memory on this node has been offlined,
+ * so we won't enqueue new work to this work.
+ *
+ * The work is using node->node_work, so we should
+ * flush work before freeing the memory.
+ */
+ flush_work(&node->node_work);
+#endif
+ kfree(node);
+}
/*
* register_node - Setup a sysfs device for a node.
@@ -259,12 +277,13 @@ static inline void hugetlb_unregister_node(struct node *node) {}
*
* Initialize and register the node device.
*/
-int register_node(struct node *node, int num, struct node *parent)
+static int register_node(struct node *node, int num, struct node *parent)
{
int error;
node->dev.id = num;
node->dev.bus = &node_subsys;
+ node->dev.release = node_device_release;
error = device_register(&node->dev);
if (!error){
@@ -306,7 +325,7 @@ void unregister_node(struct node *node)
device_unregister(&node->dev);
}
-struct node node_devices[MAX_NUMNODES];
+struct node *node_devices[MAX_NUMNODES];
/*
* register cpu under node
@@ -323,15 +342,15 @@ int register_cpu_under_node(unsigned int cpu, unsigned int nid)
if (!obj)
return 0;
- ret = sysfs_create_link(&node_devices[nid].dev.kobj,
+ ret = sysfs_create_link(&node_devices[nid]->dev.kobj,
&obj->kobj,
kobject_name(&obj->kobj));
if (ret)
return ret;
return sysfs_create_link(&obj->kobj,
- &node_devices[nid].dev.kobj,
- kobject_name(&node_devices[nid].dev.kobj));
+ &node_devices[nid]->dev.kobj,
+ kobject_name(&node_devices[nid]->dev.kobj));
}
int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
@@ -345,10 +364,10 @@ int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
if (!obj)
return 0;
- sysfs_remove_link(&node_devices[nid].dev.kobj,
+ sysfs_remove_link(&node_devices[nid]->dev.kobj,
kobject_name(&obj->kobj));
sysfs_remove_link(&obj->kobj,
- kobject_name(&node_devices[nid].dev.kobj));
+ kobject_name(&node_devices[nid]->dev.kobj));
return 0;
}
@@ -390,15 +409,15 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
continue;
if (page_nid != nid)
continue;
- ret = sysfs_create_link_nowarn(&node_devices[nid].dev.kobj,
+ ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
&mem_blk->dev.kobj,
kobject_name(&mem_blk->dev.kobj));
if (ret)
return ret;
return sysfs_create_link_nowarn(&mem_blk->dev.kobj,
- &node_devices[nid].dev.kobj,
- kobject_name(&node_devices[nid].dev.kobj));
+ &node_devices[nid]->dev.kobj,
+ kobject_name(&node_devices[nid]->dev.kobj));
}
/* mem section does not span the specified node */
return 0;
@@ -431,10 +450,10 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
continue;
if (node_test_and_set(nid, *unlinked_nodes))
continue;
- sysfs_remove_link(&node_devices[nid].dev.kobj,
+ sysfs_remove_link(&node_devices[nid]->dev.kobj,
kobject_name(&mem_blk->dev.kobj));
sysfs_remove_link(&mem_blk->dev.kobj,
- kobject_name(&node_devices[nid].dev.kobj));
+ kobject_name(&node_devices[nid]->dev.kobj));
}
NODEMASK_FREE(unlinked_nodes);
return 0;
@@ -500,7 +519,7 @@ static void node_hugetlb_work(struct work_struct *work)
static void init_node_hugetlb_work(int nid)
{
- INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work);
+ INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work);
}
static int node_memory_callback(struct notifier_block *self,
@@ -517,7 +536,7 @@ static int node_memory_callback(struct notifier_block *self,
* when transitioning to/from memoryless state.
*/
if (nid != NUMA_NO_NODE)
- schedule_work(&node_devices[nid].node_work);
+ schedule_work(&node_devices[nid]->node_work);
break;
case MEM_GOING_ONLINE:
@@ -558,9 +577,13 @@ int register_one_node(int nid)
struct node *parent = NULL;
if (p_node != nid)
- parent = &node_devices[p_node];
+ parent = node_devices[p_node];
+
+ node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
+ if (!node_devices[nid])
+ return -ENOMEM;
- error = register_node(&node_devices[nid], nid, parent);
+ error = register_node(node_devices[nid], nid, parent);
/* link cpu under this node */
for_each_present_cpu(cpu) {
@@ -581,7 +604,8 @@ int register_one_node(int nid)
void unregister_one_node(int nid)
{
- unregister_node(&node_devices[nid]);
+ unregister_node(node_devices[nid]);
+ node_devices[nid] = NULL;
}
/*
@@ -614,23 +638,23 @@ static ssize_t show_node_state(struct device *dev,
{ __ATTR(name, 0444, show_node_state, NULL), state }
static struct node_attr node_state_attr[] = {
- _NODE_ATTR(possible, N_POSSIBLE),
- _NODE_ATTR(online, N_ONLINE),
- _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
- _NODE_ATTR(has_cpu, N_CPU),
+ [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE),
+ [N_ONLINE] = _NODE_ATTR(online, N_ONLINE),
+ [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),
#ifdef CONFIG_HIGHMEM
- _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
+ [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
#endif
+ [N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
};
static struct attribute *node_state_attrs[] = {
- &node_state_attr[0].attr.attr,
- &node_state_attr[1].attr.attr,
- &node_state_attr[2].attr.attr,
- &node_state_attr[3].attr.attr,
+ &node_state_attr[N_POSSIBLE].attr.attr,
+ &node_state_attr[N_ONLINE].attr.attr,
+ &node_state_attr[N_NORMAL_MEMORY].attr.attr,
#ifdef CONFIG_HIGHMEM
- &node_state_attr[4].attr.attr,
+ &node_state_attr[N_HIGH_MEMORY].attr.attr,
#endif
+ &node_state_attr[N_CPU].attr.attr,
NULL
};
diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c
index 7d5a6b40b31c..196368009001 100644
--- a/drivers/macintosh/smu.c
+++ b/drivers/macintosh/smu.c
@@ -565,7 +565,7 @@ fail_msg_node:
fail_db_node:
of_node_put(smu->db_node);
fail_bootmem:
- free_bootmem((unsigned long)smu, sizeof(struct smu_device));
+ free_bootmem(__pa(smu), sizeof(struct smu_device));
smu = NULL;
fail_np:
of_node_put(np);
diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c
index b91e4bc332a7..3b91b0fd4de3 100644
--- a/drivers/staging/android/lowmemorykiller.c
+++ b/drivers/staging/android/lowmemorykiller.c
@@ -40,7 +40,7 @@
#include <linux/notifier.h>
static uint32_t lowmem_debug_level = 2;
-static int lowmem_adj[6] = {
+static short lowmem_adj[6] = {
0,
1,
6,
@@ -70,9 +70,9 @@ static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
int rem = 0;
int tasksize;
int i;
- int min_score_adj = OOM_SCORE_ADJ_MAX + 1;
+ short min_score_adj = OOM_SCORE_ADJ_MAX + 1;
int selected_tasksize = 0;
- int selected_oom_score_adj;
+ short selected_oom_score_adj;
int array_size = ARRAY_SIZE(lowmem_adj);
int other_free = global_page_state(NR_FREE_PAGES);
int other_file = global_page_state(NR_FILE_PAGES) -
@@ -90,7 +90,7 @@ static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
}
}
if (sc->nr_to_scan > 0)
- lowmem_print(3, "lowmem_shrink %lu, %x, ofree %d %d, ma %d\n",
+ lowmem_print(3, "lowmem_shrink %lu, %x, ofree %d %d, ma %hd\n",
sc->nr_to_scan, sc->gfp_mask, other_free,
other_file, min_score_adj);
rem = global_page_state(NR_ACTIVE_ANON) +
@@ -107,7 +107,7 @@ static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
rcu_read_lock();
for_each_process(tsk) {
struct task_struct *p;
- int oom_score_adj;
+ short oom_score_adj;
if (tsk->flags & PF_KTHREAD)
continue;
@@ -141,11 +141,11 @@ static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
selected = p;
selected_tasksize = tasksize;
selected_oom_score_adj = oom_score_adj;
- lowmem_print(2, "select %d (%s), adj %d, size %d, to kill\n",
+ lowmem_print(2, "select %d (%s), adj %hd, size %d, to kill\n",
p->pid, p->comm, oom_score_adj, tasksize);
}
if (selected) {
- lowmem_print(1, "send sigkill to %d (%s), adj %d, size %d\n",
+ lowmem_print(1, "send sigkill to %d (%s), adj %hd, size %d\n",
selected->pid, selected->comm,
selected_oom_score_adj, selected_tasksize);
lowmem_deathpending_timeout = jiffies + HZ;
@@ -176,7 +176,7 @@ static void __exit lowmem_exit(void)
}
module_param_named(cost, lowmem_shrinker.seeks, int, S_IRUGO | S_IWUSR);
-module_param_array_named(adj, lowmem_adj, int, &lowmem_adj_size,
+module_param_array_named(adj, lowmem_adj, short, &lowmem_adj_size,
S_IRUGO | S_IWUSR);
module_param_array_named(minfree, lowmem_minfree, uint, &lowmem_minfree_size,
S_IRUGO | S_IWUSR);
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 0908e6044333..2a70558b36ea 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -27,13 +27,15 @@
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/balloon_compaction.h>
/*
* Balloon device works in 4K page units. So each page is pointed to by
* multiple balloon pages. All memory counters in this driver are in balloon
* page units.
*/
-#define VIRTIO_BALLOON_PAGES_PER_PAGE (PAGE_SIZE >> VIRTIO_BALLOON_PFN_SHIFT)
+#define VIRTIO_BALLOON_PAGES_PER_PAGE (unsigned)(PAGE_SIZE >> VIRTIO_BALLOON_PFN_SHIFT)
+#define VIRTIO_BALLOON_ARRAY_PFNS_MAX 256
struct virtio_balloon
{
@@ -52,15 +54,19 @@ struct virtio_balloon
/* Number of balloon pages we've told the Host we're not using. */
unsigned int num_pages;
/*
- * The pages we've told the Host we're not using.
+ * The pages we've told the Host we're not using are enqueued
+ * at vb_dev_info->pages list.
* Each page on this list adds VIRTIO_BALLOON_PAGES_PER_PAGE
* to num_pages above.
*/
- struct list_head pages;
+ struct balloon_dev_info *vb_dev_info;
+
+ /* Synchronize access/update to this struct virtio_balloon elements */
+ struct mutex balloon_lock;
/* The array of pfns we tell the Host about. */
unsigned int num_pfns;
- u32 pfns[256];
+ u32 pfns[VIRTIO_BALLOON_ARRAY_PFNS_MAX];
/* Memory statistics */
int need_stats_update;
@@ -122,18 +128,21 @@ static void set_page_pfns(u32 pfns[], struct page *page)
static void fill_balloon(struct virtio_balloon *vb, size_t num)
{
+ struct balloon_dev_info *vb_dev_info = vb->vb_dev_info;
+
/* We can only do one array worth at a time. */
num = min(num, ARRAY_SIZE(vb->pfns));
+ mutex_lock(&vb->balloon_lock);
for (vb->num_pfns = 0; vb->num_pfns < num;
vb->num_pfns += VIRTIO_BALLOON_PAGES_PER_PAGE) {
- struct page *page = alloc_page(GFP_HIGHUSER | __GFP_NORETRY |
- __GFP_NOMEMALLOC | __GFP_NOWARN);
+ struct page *page = balloon_page_enqueue(vb_dev_info);
+
if (!page) {
if (printk_ratelimit())
dev_printk(KERN_INFO, &vb->vdev->dev,
- "Out of puff! Can't get %zu pages\n",
- num);
+ "Out of puff! Can't get %u pages\n",
+ VIRTIO_BALLOON_PAGES_PER_PAGE);
/* Sleep for at least 1/5 of a second before retry. */
msleep(200);
break;
@@ -141,14 +150,12 @@ static void fill_balloon(struct virtio_balloon *vb, size_t num)
set_page_pfns(vb->pfns + vb->num_pfns, page);
vb->num_pages += VIRTIO_BALLOON_PAGES_PER_PAGE;
totalram_pages--;
- list_add(&page->lru, &vb->pages);
}
- /* Didn't get any? Oh well. */
- if (vb->num_pfns == 0)
- return;
-
- tell_host(vb, vb->inflate_vq);
+ /* Did we get any? */
+ if (vb->num_pfns != 0)
+ tell_host(vb, vb->inflate_vq);
+ mutex_unlock(&vb->balloon_lock);
}
static void release_pages_by_pfn(const u32 pfns[], unsigned int num)
@@ -157,7 +164,7 @@ static void release_pages_by_pfn(const u32 pfns[], unsigned int num)
/* Find pfns pointing at start of each page, get pages and free them. */
for (i = 0; i < num; i += VIRTIO_BALLOON_PAGES_PER_PAGE) {
- __free_page(balloon_pfn_to_page(pfns[i]));
+ balloon_page_free(balloon_pfn_to_page(pfns[i]));
totalram_pages++;
}
}
@@ -165,14 +172,17 @@ static void release_pages_by_pfn(const u32 pfns[], unsigned int num)
static void leak_balloon(struct virtio_balloon *vb, size_t num)
{
struct page *page;
+ struct balloon_dev_info *vb_dev_info = vb->vb_dev_info;
/* We can only do one array worth at a time. */
num = min(num, ARRAY_SIZE(vb->pfns));
+ mutex_lock(&vb->balloon_lock);
for (vb->num_pfns = 0; vb->num_pfns < num;
vb->num_pfns += VIRTIO_BALLOON_PAGES_PER_PAGE) {
- page = list_first_entry(&vb->pages, struct page, lru);
- list_del(&page->lru);
+ page = balloon_page_dequeue(vb_dev_info);
+ if (!page)
+ break;
set_page_pfns(vb->pfns + vb->num_pfns, page);
vb->num_pages -= VIRTIO_BALLOON_PAGES_PER_PAGE;
}
@@ -183,6 +193,7 @@ static void leak_balloon(struct virtio_balloon *vb, size_t num)
* is true, we *have* to do it in this order
*/
tell_host(vb, vb->deflate_vq);
+ mutex_unlock(&vb->balloon_lock);
release_pages_by_pfn(vb->pfns, vb->num_pfns);
}
@@ -339,9 +350,84 @@ static int init_vqs(struct virtio_balloon *vb)
return 0;
}
+static const struct address_space_operations virtio_balloon_aops;
+#ifdef CONFIG_BALLOON_COMPACTION
+/*
+ * virtballoon_migratepage - perform the balloon page migration on behalf of
+ * a compation thread. (called under page lock)
+ * @mapping: the page->mapping which will be assigned to the new migrated page.
+ * @newpage: page that will replace the isolated page after migration finishes.
+ * @page : the isolated (old) page that is about to be migrated to newpage.
+ * @mode : compaction mode -- not used for balloon page migration.
+ *
+ * After a ballooned page gets isolated by compaction procedures, this is the
+ * function that performs the page migration on behalf of a compaction thread
+ * The page migration for virtio balloon is done in a simple swap fashion which
+ * follows these two macro steps:
+ * 1) insert newpage into vb->pages list and update the host about it;
+ * 2) update the host about the old page removed from vb->pages list;
+ *
+ * This function preforms the balloon page migration task.
+ * Called through balloon_mapping->a_ops->migratepage
+ */
+int virtballoon_migratepage(struct address_space *mapping,
+ struct page *newpage, struct page *page, enum migrate_mode mode)
+{
+ struct balloon_dev_info *vb_dev_info = balloon_page_device(page);
+ struct virtio_balloon *vb;
+ unsigned long flags;
+
+ BUG_ON(!vb_dev_info);
+
+ vb = vb_dev_info->balloon_device;
+
+ /*
+ * In order to avoid lock contention while migrating pages concurrently
+ * to leak_balloon() or fill_balloon() we just give up the balloon_lock
+ * this turn, as it is easier to retry the page migration later.
+ * This also prevents fill_balloon() getting stuck into a mutex
+ * recursion in the case it ends up triggering memory compaction
+ * while it is attempting to inflate the ballon.
+ */
+ if (!mutex_trylock(&vb->balloon_lock))
+ return -EAGAIN;
+
+ /* balloon's page migration 1st step -- inflate "newpage" */
+ spin_lock_irqsave(&vb_dev_info->pages_lock, flags);
+ balloon_page_insert(newpage, mapping, &vb_dev_info->pages);
+ vb_dev_info->isolated_pages--;
+ spin_unlock_irqrestore(&vb_dev_info->pages_lock, flags);
+ vb->num_pfns = VIRTIO_BALLOON_PAGES_PER_PAGE;
+ set_page_pfns(vb->pfns, newpage);
+ tell_host(vb, vb->inflate_vq);
+
+ /*
+ * balloon's page migration 2nd step -- deflate "page"
+ *
+ * It's safe to delete page->lru here because this page is at
+ * an isolated migration list, and this step is expected to happen here
+ */
+ balloon_page_delete(page);
+ vb->num_pfns = VIRTIO_BALLOON_PAGES_PER_PAGE;
+ set_page_pfns(vb->pfns, page);
+ tell_host(vb, vb->deflate_vq);
+
+ mutex_unlock(&vb->balloon_lock);
+
+ return MIGRATEPAGE_BALLOON_SUCCESS;
+}
+
+/* define the balloon_mapping->a_ops callback to allow balloon page migration */
+static const struct address_space_operations virtio_balloon_aops = {
+ .migratepage = virtballoon_migratepage,
+};
+#endif /* CONFIG_BALLOON_COMPACTION */
+
static int virtballoon_probe(struct virtio_device *vdev)
{
struct virtio_balloon *vb;
+ struct address_space *vb_mapping;
+ struct balloon_dev_info *vb_devinfo;
int err;
vdev->priv = vb = kmalloc(sizeof(*vb), GFP_KERNEL);
@@ -350,16 +436,37 @@ static int virtballoon_probe(struct virtio_device *vdev)
goto out;
}
- INIT_LIST_HEAD(&vb->pages);
vb->num_pages = 0;
+ mutex_init(&vb->balloon_lock);
init_waitqueue_head(&vb->config_change);
init_waitqueue_head(&vb->acked);
vb->vdev = vdev;
vb->need_stats_update = 0;
+ vb_devinfo = balloon_devinfo_alloc(vb);
+ if (IS_ERR(vb_devinfo)) {
+ err = PTR_ERR(vb_devinfo);
+ goto out_free_vb;
+ }
+
+ vb_mapping = balloon_mapping_alloc(vb_devinfo,
+ (balloon_compaction_check()) ?
+ &virtio_balloon_aops : NULL);
+ if (IS_ERR(vb_mapping)) {
+ /*
+ * IS_ERR(vb_mapping) && PTR_ERR(vb_mapping) == -EOPNOTSUPP
+ * This means !CONFIG_BALLOON_COMPACTION, otherwise we get off.
+ */
+ err = PTR_ERR(vb_mapping);
+ if (err != -EOPNOTSUPP)
+ goto out_free_vb_devinfo;
+ }
+
+ vb->vb_dev_info = vb_devinfo;
+
err = init_vqs(vb);
if (err)
- goto out_free_vb;
+ goto out_free_vb_mapping;
vb->thread = kthread_run(balloon, vb, "vballoon");
if (IS_ERR(vb->thread)) {
@@ -371,6 +478,10 @@ static int virtballoon_probe(struct virtio_device *vdev)
out_del_vqs:
vdev->config->del_vqs(vdev);
+out_free_vb_mapping:
+ balloon_mapping_free(vb_mapping);
+out_free_vb_devinfo:
+ balloon_devinfo_free(vb_devinfo);
out_free_vb:
kfree(vb);
out:
@@ -396,6 +507,8 @@ static void __devexit virtballoon_remove(struct virtio_device *vdev)
kthread_stop(vb->thread);
remove_common(vb);
+ balloon_mapping_free(vb->vb_dev_info->mapping);
+ balloon_devinfo_free(vb->vb_dev_info);
kfree(vb);
}
generated by cgit v1.2.3 (git 2.0.4) at 2025-01-22 13:38:57 +0000