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-rw-r--r--mm/vmalloc.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index fb42a5bffe47..12d27ac303ae 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -21,6 +21,7 @@
#include <linux/debugobjects.h>
#include <linux/kallsyms.h>
#include <linux/list.h>
+#include <linux/notifier.h>
#include <linux/rbtree.h>
#include <linux/radix-tree.h>
#include <linux/rcupdate.h>
@@ -344,6 +345,8 @@ static void __insert_vmap_area(struct vmap_area *va)
static void purge_vmap_area_lazy(void);
+static BLOCKING_NOTIFIER_HEAD(vmap_notify_list);
+
/*
* Allocate a region of KVA of the specified size and alignment, within the
* vstart and vend.
@@ -363,6 +366,8 @@ static struct vmap_area *alloc_vmap_area(unsigned long size,
BUG_ON(offset_in_page(size));
BUG_ON(!is_power_of_2(align));
+ might_sleep_if(gfpflags_allow_blocking(gfp_mask));
+
va = kmalloc_node(sizeof(struct vmap_area),
gfp_mask & GFP_RECLAIM_MASK, node);
if (unlikely(!va))
@@ -468,6 +473,16 @@ overflow:
purged = 1;
goto retry;
}
+
+ if (gfpflags_allow_blocking(gfp_mask)) {
+ unsigned long freed = 0;
+ blocking_notifier_call_chain(&vmap_notify_list, 0, &freed);
+ if (freed > 0) {
+ purged = 0;
+ goto retry;
+ }
+ }
+
if (printk_ratelimit())
pr_warn("vmap allocation for size %lu failed: "
"use vmalloc=<size> to increase size.\n", size);
@@ -475,6 +490,18 @@ overflow:
return ERR_PTR(-EBUSY);
}
+int register_vmap_purge_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&vmap_notify_list, nb);
+}
+EXPORT_SYMBOL_GPL(register_vmap_purge_notifier);
+
+int unregister_vmap_purge_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&vmap_notify_list, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_vmap_purge_notifier);
+
static void __free_vmap_area(struct vmap_area *va)
{
BUG_ON(RB_EMPTY_NODE(&va->rb_node));