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authorKeqian Zhu <zhukeqian1@huawei.com>2020-12-17 09:49:40 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2021-03-06 11:41:54 +0100
commite0a8f99355c32b48c9ef867127075b5267ae23d8 (patch)
tree3c750b728cdffacbaca86499a77b8848d578f4d9 /tests/qapi-schema/test-qapi.py
parent10b6ee1616f984c1889d0851226a9ff14b35ac58 (diff)
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accel: kvm: Fix memory waste under mismatch page size
When handle dirty log, we face qemu_real_host_page_size and TARGET_PAGE_SIZE. The first one is the granule of KVM dirty bitmap, and the second one is the granule of QEMU dirty bitmap. As qemu_real_host_page_size >= TARGET_PAGE_SIZE (kvm_init() enforced it), misuse TARGET_PAGE_SIZE to init kvmslot dirty_bmap may waste memory. For example, when qemu_real_host_page_size is 64K and TARGET_PAGE_SIZE is 4K, it wastes 93.75% (15/16) memory. Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Message-Id: <20201217014941.22872-2-zhukeqian1@huawei.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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