[RFC][PATCH 2/9] rename x86 kvm->arch.n_alloc_mmu_pages

Dave Hansen
2010-06-15T13:55:20Z

Again, I think this is a poor choice of names. This value truly
means, "the number of pages which _may_ be allocated". But,
reading the value, "n_alloc_mmu_pages", I'm unable to think of
anything it should mean other than "the number of allocated mmu
pages", which is dead wrong.

It's really the high watermark, so let's give it a name to match:
nr_max_mmu_pages. This change will make the next few patches
much more obvious and easy to read.

Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
---

linux-2.6.git-dave/arch/x86/include/asm/kvm_host.h | 2 +-
linux-2.6.git-dave/arch/x86/kvm/mmu.c | 8 ++++----
linux-2.6.git-dave/arch/x86/kvm/x86.c | 2 +-
3 files changed, 6 insertions(+), 6 deletions(-)

diff -puN arch/x86/include/asm/kvm_host.h~rename-kvm_alloc arch/x86/include/asm/kvm_host.h
--- linux-2.6.git/arch/x86/include/asm/kvm_host.h~rename-kvm_alloc 2010-06-09 15:14:28.000000000 -0700
+++ linux-2.6.git-dave/arch/x86/include/asm/kvm_host.h 2010-06-09 15:14:28.000000000 -0700
@@ -382,7 +382,7 @@ struct kvm_arch {

unsigned int n_free_mmu_pages;
unsigned int n_requested_mmu_pages;
- unsigned int n_alloc_mmu_pages;
+ unsigned int n_max_mmu_pages;
atomic_t invlpg_counter;
struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
/*
diff -puN arch/x86/kvm/mmu.c~rename-kvm_alloc arch/x86/kvm/mmu.c
--- linux-2.6.git/arch/x86/kvm/mmu.c~rename-kvm_alloc 2010-06-09 15:14:28.000000000 -0700
+++ linux-2.6.git-dave/arch/x86/kvm/mmu.c 2010-06-09 15:14:28.000000000 -0700
@@ -1522,7 +1522,7 @@ void kvm_mmu_change_mmu_pages(struct kvm
{
int used_pages;

- used_pages = kvm->arch.n_alloc_mmu_pages - kvm_mmu_available_pages(kvm);
+ used_pages = kvm->arch.n_max_mmu_pages - kvm_mmu_available_pages(kvm);
used_pages = max(0, used_pages);

/*
@@ -1546,9 +1546,9 @@ void kvm_mmu_change_mmu_pages(struct kvm
}
else
kvm->arch.n_free_mmu_pages += kvm_nr_mmu_pages
- - kvm->arch.n_alloc_mmu_pages;
+ - kvm->arch.n_max_mmu_pages;

- kvm->arch.n_alloc_mmu_pages = kvm_nr_mmu_pages;
+ kvm->arch.n_max_mmu_pages = kvm_nr_mmu_pages;
}

static int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn)
@@ -2932,7 +2932,7 @@ static int mmu_shrink(int nr_to_scan, gf

idx = srcu_read_lock(&kvm->srcu);
spin_lock(&kvm->mmu_lock);
- npages = kvm->arch.n_alloc_mmu_pages -
+ npages = kvm->arch.n_max_mmu_pages -
kvm_mmu_available_pages(kvm);
cache_count += npages;
if (!kvm_freed && nr_to_scan > 0 && npages > 0) {
diff -puN arch/x86/kvm/x86.c~rename-kvm_alloc arch/x86/kvm/x86.c
--- linux-2.6.git/arch/x86/kvm/x86.c~rename-kvm_alloc 2010-06-09 15:14:28.000000000 -0700
+++ linux-2.6.git-dave/arch/x86/kvm/x86.c 2010-06-09 15:14:28.000000000 -0700
@@ -2557,7 +2557,7 @@ static int kvm_vm_ioctl_set_nr_mmu_pages

static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
{
- return kvm->arch.n_alloc_mmu_pages;
+ return kvm->arch.n_max_mmu_pages;
}

gfn_t unalias_gfn_instantiation(struct kvm *kvm, gfn_t gfn)
_