KVM: MMU: Make pte_list_desc fit cache lines well

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We have PTE_LIST_EXT + 1 pointers in this structure and these 40/20
bytes do not fit cache lines well.  Furthermore, some allocators may
use 64/32-byte objects for the pte_list_desc cache.

This patch solves this problem by changing PTE_LIST_EXT from 4 to 3.

For shadow paging, the new size is still large enough to hold both the
kernel and process mappings for usual anonymous pages.  For file
mappings, there may be a slight change in the cache usage.

Note: with EPT/NPT we almost always have a single spte in each reverse
mapping and we will not see any change by this.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>

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Takuya Yoshikawa 2012-03-21 23:49:39 +09:00 • committed by Avi Kivity

parent c36fc04ef5

commit 220f773a00

1 changed files with 3 additions and 2 deletions

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arch/x86/kvm/mmu.c

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