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authorAvi Kivity <avi@qumranet.com>2007-04-16 11:53:17 +0300
committerAvi Kivity <avi@qumranet.com>2007-05-03 10:52:29 +0300
commit8c4385024d31cb909ad84a2cafa5c83a4c5fab61 (patch)
tree9c6df8e13bf475985b682704cbe0b587072cc087 /drivers/kvm
parentb5a33a75720c03d58d8281a72b45ffd214f00ed7 (diff)
downloadblackbird-op-linux-8c4385024d31cb909ad84a2cafa5c83a4c5fab61.tar.gz
blackbird-op-linux-8c4385024d31cb909ad84a2cafa5c83a4c5fab61.zip
KVM: Retry sleeping allocation if atomic allocation fails
This avoids -ENOMEM under memory pressure. Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm')
-rw-r--r--drivers/kvm/mmu.c26
1 files changed, 21 insertions, 5 deletions
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index a368ea8297f3..c814394a966d 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -199,14 +199,15 @@ static int is_rmap_pte(u64 pte)
}
static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
- struct kmem_cache *base_cache, int min)
+ struct kmem_cache *base_cache, int min,
+ gfp_t gfp_flags)
{
void *obj;
if (cache->nobjs >= min)
return 0;
while (cache->nobjs < ARRAY_SIZE(cache->objects)) {
- obj = kmem_cache_zalloc(base_cache, GFP_NOWAIT);
+ obj = kmem_cache_zalloc(base_cache, gfp_flags);
if (!obj)
return -ENOMEM;
cache->objects[cache->nobjs++] = obj;
@@ -220,20 +221,35 @@ static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc)
kfree(mc->objects[--mc->nobjs]);
}
-static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu)
+static int __mmu_topup_memory_caches(struct kvm_vcpu *vcpu, gfp_t gfp_flags)
{
int r;
r = mmu_topup_memory_cache(&vcpu->mmu_pte_chain_cache,
- pte_chain_cache, 4);
+ pte_chain_cache, 4, gfp_flags);
if (r)
goto out;
r = mmu_topup_memory_cache(&vcpu->mmu_rmap_desc_cache,
- rmap_desc_cache, 1);
+ rmap_desc_cache, 1, gfp_flags);
out:
return r;
}
+static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu)
+{
+ int r;
+
+ r = __mmu_topup_memory_caches(vcpu, GFP_NOWAIT);
+ if (r < 0) {
+ spin_unlock(&vcpu->kvm->lock);
+ kvm_arch_ops->vcpu_put(vcpu);
+ r = __mmu_topup_memory_caches(vcpu, GFP_KERNEL);
+ kvm_arch_ops->vcpu_load(vcpu);
+ spin_lock(&vcpu->kvm->lock);
+ }
+ return r;
+}
+
static void mmu_free_memory_caches(struct kvm_vcpu *vcpu)
{
mmu_free_memory_cache(&vcpu->mmu_pte_chain_cache);
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