this is the shrinker patch with all comments applied beside adding aging
mechanism
it look like the aging mechanism is not really needed and therefor for now it
isn't
implemented.
>From 8503a57ae88ba819e4eac6371172772c98b485f0 Mon Sep 17 00:00:00 2001
From: Izik Eidus <[EMAIL PROTECTED]>
Date: Tue, 25 Mar 2008 14:03:27 +0200
Subject: [PATCH] KVM: register the kvm mmu cache with the shrinker.
Signed-off-by: Izik Eidus <[EMAIL PROTECTED]>
---
arch/x86/kvm/mmu.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 54 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index c67ec62..c42c0db 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1972,6 +1972,57 @@ void kvm_mmu_zap_all(struct kvm *kvm)
kvm_flush_remote_tlbs(kvm);
}
+void kvm_mmu_remove_one_alloc_mmu_page(struct kvm *kvm)
+{
+ struct kvm_mmu_page *page;
+
+ page = container_of(kvm->arch.active_mmu_pages.prev,
+ struct kvm_mmu_page, link);
+ kvm_mmu_zap_page(kvm, page);
+}
+
+static int mmu_shrink(int nr_to_scan, gfp_t gfp_mask)
+{
+ struct kvm *kvm;
+ struct kvm *kvm_freed = NULL;
+ int cache_count = 0;
+
+ spin_lock(&kvm_lock);
+ if (list_empty(&vm_list)) {
+ spin_unlock(&kvm_lock);
+ return 0;
+ }
+ list_for_each_entry(kvm, &vm_list, vm_list) {
+ int npages;
+
+ spin_lock(&kvm->mmu_lock);
+ npages = kvm->arch.n_alloc_mmu_pages -
+ kvm->arch.n_free_mmu_pages;
+ cache_count += npages - KVM_MIN_ALLOC_MMU_PAGES;
+ if (!kvm_freed && nr_to_scan > 0 && npages >
+ KVM_MIN_ALLOC_MMU_PAGES) {
+ kvm_mmu_remove_one_alloc_mmu_page(kvm);
+ cache_count--;
+ kvm_freed = kvm;
+ }
+ nr_to_scan--;
+
+ spin_unlock(&kvm->mmu_lock);
+ }
+ if (kvm_freed) {
+ list_del(&kvm_freed->vm_list);
+ list_add_tail(&kvm_freed->vm_list, &vm_list);
+ }
+ spin_unlock(&kvm_lock);
+
+ return cache_count;
+}
+
+static struct shrinker mmu_shrinker = {
+ .shrink = mmu_shrink,
+ .seeks = DEFAULT_SEEKS * 10,
+};
+
void kvm_mmu_module_exit(void)
{
if (pte_chain_cache)
@@ -1980,6 +2031,7 @@ void kvm_mmu_module_exit(void)
kmem_cache_destroy(rmap_desc_cache);
if (mmu_page_header_cache)
kmem_cache_destroy(mmu_page_header_cache);
--
woof.
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