KVM use gfn_to_page very frequestly, which makes find_get_page a bottleneck,
so cache pages found to speed up.
Signed-off-by: Shaohua Li <[EMAIL PROTECTED]>
---
drivers/kvm/kvm.h | 1 +
drivers/kvm/kvm_main.c | 9 +++++++++
2 files changed, 10 insertions(+)
Index: linux/drivers/kvm/kvm.h
===================================================================
--- linux.orig/drivers/kvm/kvm.h 2007-07-20 14:29:46.000000000 +0800
+++ linux/drivers/kvm/kvm.h 2007-07-20 14:50:11.000000000 +0800
@@ -431,6 +431,7 @@ struct kvm_mem_alias {
struct kvm_page_info {
swp_entry_t entry;
+ struct page *page;
};
struct kvm_memory_slot {
Index: linux/drivers/kvm/kvm_main.c
===================================================================
--- linux.orig/drivers/kvm/kvm_main.c 2007-07-20 14:45:40.000000000 +0800
+++ linux/drivers/kvm/kvm_main.c 2007-07-20 14:50:11.000000000 +0800
@@ -1031,6 +1031,7 @@ repeat:
info->entry.val = 0;
if (add_to_page_cache(page, mapping, gfn, GFP_KERNEL))
return NULL;
+ info->page = page;
ClearPageDirty(page);
} else {
/* allocate new page */
@@ -1041,6 +1042,7 @@ repeat:
page_cache_release(page);
return NULL;
}
+ info->page = page;
SetPageUptodate(page);
set_page_private(page, 0);
}
@@ -1063,6 +1065,7 @@ static int kvm_move_to_swap(struct page
if (move_to_swap_cache(page, swap) == 0) {
slot = __gfn_to_memslot(kvm, gfn);
slot->phys_mem[gfn - slot->base_gfn].entry = swap;
+ slot->phys_mem[gfn - slot->base_gfn].page = NULL;
return 0;
}
swap_free(swap);
@@ -1082,6 +1085,12 @@ struct page *gfn_to_page(struct kvm *kvm
if (!slot)
return NULL;
+ page = slot->phys_mem[gfn - slot->base_gfn].page;
+ if (page) {
+ mark_page_accessed(page);
+ return page;
+ }
+
page = find_get_page(mapping, gfn);
if (page)
goto out;
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