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author | Keqian Zhu <zhukeqian1@huawei.com> | 2020-12-17 09:49:40 +0800 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-03-06 11:41:54 +0100 |
commit | e0a8f99355c32b48c9ef867127075b5267ae23d8 (patch) | |
tree | 3c750b728cdffacbaca86499a77b8848d578f4d9 /tests/qapi-schema/test-qapi.py | |
parent | 10b6ee1616f984c1889d0851226a9ff14b35ac58 (diff) | |
download | qemu-e0a8f99355c32b48c9ef867127075b5267ae23d8.zip qemu-e0a8f99355c32b48c9ef867127075b5267ae23d8.tar.gz qemu-e0a8f99355c32b48c9ef867127075b5267ae23d8.tar.bz2 |
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>
Diffstat (limited to 'tests/qapi-schema/test-qapi.py')
0 files changed, 0 insertions, 0 deletions