aboutsummaryrefslogtreecommitdiff
path: root/drivers/kvm/mmu.c
diff options
context:
space:
mode:
authorAvi Kivity <avi@qumranet.com>2007-04-15 16:31:09 +0300
committerAvi Kivity <avi@qumranet.com>2007-05-03 10:52:29 +0300
commitb5a33a75720c03d58d8281a72b45ffd214f00ed7 (patch)
tree7451b196f292eb96caf5173ad3c6459ab9efb1d7 /drivers/kvm/mmu.c
parent417726a3fbecb2092f1054bbaee87bc442b05ef3 (diff)
KVM: Use slab caches to allocate mmu data structures
Better leak detection, statistics, memory use, speed -- goodness all around. Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/mmu.c')
-rw-r--r--drivers/kvm/mmu.c39
1 files changed, 35 insertions, 4 deletions
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index 9ff74805c7d..a368ea8297f 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -159,6 +159,9 @@ struct kvm_rmap_desc {
struct kvm_rmap_desc *more;
};
+static struct kmem_cache *pte_chain_cache;
+static struct kmem_cache *rmap_desc_cache;
+
static int is_write_protection(struct kvm_vcpu *vcpu)
{
return vcpu->cr0 & CR0_WP_MASK;
@@ -196,14 +199,14 @@ static int is_rmap_pte(u64 pte)
}
static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
- size_t objsize, int min)
+ struct kmem_cache *base_cache, int min)
{
void *obj;
if (cache->nobjs >= min)
return 0;
while (cache->nobjs < ARRAY_SIZE(cache->objects)) {
- obj = kzalloc(objsize, GFP_NOWAIT);
+ obj = kmem_cache_zalloc(base_cache, GFP_NOWAIT);
if (!obj)
return -ENOMEM;
cache->objects[cache->nobjs++] = obj;
@@ -222,11 +225,11 @@ static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu)
int r;
r = mmu_topup_memory_cache(&vcpu->mmu_pte_chain_cache,
- sizeof(struct kvm_pte_chain), 4);
+ pte_chain_cache, 4);
if (r)
goto out;
r = mmu_topup_memory_cache(&vcpu->mmu_rmap_desc_cache,
- sizeof(struct kvm_rmap_desc), 1);
+ rmap_desc_cache, 1);
out:
return r;
}
@@ -1333,6 +1336,34 @@ void kvm_mmu_zap_all(struct kvm_vcpu *vcpu)
init_kvm_mmu(vcpu);
}
+void kvm_mmu_module_exit(void)
+{
+ if (pte_chain_cache)
+ kmem_cache_destroy(pte_chain_cache);
+ if (rmap_desc_cache)
+ kmem_cache_destroy(rmap_desc_cache);
+}
+
+int kvm_mmu_module_init(void)
+{
+ pte_chain_cache = kmem_cache_create("kvm_pte_chain",
+ sizeof(struct kvm_pte_chain),
+ 0, 0, NULL, NULL);
+ if (!pte_chain_cache)
+ goto nomem;
+ rmap_desc_cache = kmem_cache_create("kvm_rmap_desc",
+ sizeof(struct kvm_rmap_desc),
+ 0, 0, NULL, NULL);
+ if (!rmap_desc_cache)
+ goto nomem;
+
+ return 0;
+
+nomem:
+ kvm_mmu_module_exit();
+ return -ENOMEM;
+}
+
#ifdef AUDIT
static const char *audit_msg;