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| author | Avi Kivity <avi@qumranet.com> | 2007-04-16 08:53:17 (GMT) |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-05-03 07:52:29 (GMT) |
| commit | 8c4385024d31cb909ad84a2cafa5c83a4c5fab61 (patch) | |
| tree | 9c6df8e13bf475985b682704cbe0b587072cc087 /drivers | |
| parent | b5a33a75720c03d58d8281a72b45ffd214f00ed7 (diff) | |
| download | linux-8c4385024d31cb909ad84a2cafa5c83a4c5fab61.tar.xz | |
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')
| -rw-r--r-- | drivers/kvm/mmu.c | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c index a368ea8..c814394 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); |