diff options
author | Izik Eidus <izike@qumranet.com> | 2008-03-30 08:17:21 -0400 |
---|---|---|
committer | Avi Kivity <avi@qumranet.com> | 2008-04-27 05:00:53 -0400 |
commit | 3ee16c814511cd58f956b47b9c7654f57f674688 (patch) | |
tree | 38eb024cd6292c85b57a8ea7b2a761e174db3884 | |
parent | 3200f405a1e8e06c8634f11d33614455baa4e6be (diff) |
KVM: MMU: allow the vm to shrink the kvm mmu shadow caches
Allow the Linux memory manager to reclaim memory in the kvm shadow cache.
Signed-off-by: Izik Eidus <izike@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
-rw-r--r-- | arch/x86/kvm/mmu.c | 58 |
1 files changed, 56 insertions, 2 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index c563283cb982..1594ee06c920 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c | |||
@@ -1966,7 +1966,53 @@ void kvm_mmu_zap_all(struct kvm *kvm) | |||
1966 | kvm_flush_remote_tlbs(kvm); | 1966 | kvm_flush_remote_tlbs(kvm); |
1967 | } | 1967 | } |
1968 | 1968 | ||
1969 | void kvm_mmu_module_exit(void) | 1969 | void kvm_mmu_remove_one_alloc_mmu_page(struct kvm *kvm) |
1970 | { | ||
1971 | struct kvm_mmu_page *page; | ||
1972 | |||
1973 | page = container_of(kvm->arch.active_mmu_pages.prev, | ||
1974 | struct kvm_mmu_page, link); | ||
1975 | kvm_mmu_zap_page(kvm, page); | ||
1976 | } | ||
1977 | |||
1978 | static int mmu_shrink(int nr_to_scan, gfp_t gfp_mask) | ||
1979 | { | ||
1980 | struct kvm *kvm; | ||
1981 | struct kvm *kvm_freed = NULL; | ||
1982 | int cache_count = 0; | ||
1983 | |||
1984 | spin_lock(&kvm_lock); | ||
1985 | |||
1986 | list_for_each_entry(kvm, &vm_list, vm_list) { | ||
1987 | int npages; | ||
1988 | |||
1989 | spin_lock(&kvm->mmu_lock); | ||
1990 | npages = kvm->arch.n_alloc_mmu_pages - | ||
1991 | kvm->arch.n_free_mmu_pages; | ||
1992 | cache_count += npages; | ||
1993 | if (!kvm_freed && nr_to_scan > 0 && npages > 0) { | ||
1994 | kvm_mmu_remove_one_alloc_mmu_page(kvm); | ||
1995 | cache_count--; | ||
1996 | kvm_freed = kvm; | ||
1997 | } | ||
1998 | nr_to_scan--; | ||
1999 | |||
2000 | spin_unlock(&kvm->mmu_lock); | ||
2001 | } | ||
2002 | if (kvm_freed) | ||
2003 | list_move_tail(&kvm_freed->vm_list, &vm_list); | ||
2004 | |||
2005 | spin_unlock(&kvm_lock); | ||
2006 | |||
2007 | return cache_count; | ||
2008 | } | ||
2009 | |||
2010 | static struct shrinker mmu_shrinker = { | ||
2011 | .shrink = mmu_shrink, | ||
2012 | .seeks = DEFAULT_SEEKS * 10, | ||
2013 | }; | ||
2014 | |||
2015 | void mmu_destroy_caches(void) | ||
1970 | { | 2016 | { |
1971 | if (pte_chain_cache) | 2017 | if (pte_chain_cache) |
1972 | kmem_cache_destroy(pte_chain_cache); | 2018 | kmem_cache_destroy(pte_chain_cache); |
@@ -1976,6 +2022,12 @@ void kvm_mmu_module_exit(void) | |||
1976 | kmem_cache_destroy(mmu_page_header_cache); | 2022 | kmem_cache_destroy(mmu_page_header_cache); |
1977 | } | 2023 | } |
1978 | 2024 | ||
2025 | void kvm_mmu_module_exit(void) | ||
2026 | { | ||
2027 | mmu_destroy_caches(); | ||
2028 | unregister_shrinker(&mmu_shrinker); | ||
2029 | } | ||
2030 | |||
1979 | int kvm_mmu_module_init(void) | 2031 | int kvm_mmu_module_init(void) |
1980 | { | 2032 | { |
1981 | pte_chain_cache = kmem_cache_create("kvm_pte_chain", | 2033 | pte_chain_cache = kmem_cache_create("kvm_pte_chain", |
@@ -1995,10 +2047,12 @@ int kvm_mmu_module_init(void) | |||
1995 | if (!mmu_page_header_cache) | 2047 | if (!mmu_page_header_cache) |
1996 | goto nomem; | 2048 | goto nomem; |
1997 | 2049 | ||
2050 | register_shrinker(&mmu_shrinker); | ||
2051 | |||
1998 | return 0; | 2052 | return 0; |
1999 | 2053 | ||
2000 | nomem: | 2054 | nomem: |
2001 | kvm_mmu_module_exit(); | 2055 | mmu_destroy_caches(); |
2002 | return -ENOMEM; | 2056 | return -ENOMEM; |
2003 | } | 2057 | } |
2004 | 2058 | ||