On Tue, Mar 16, 2021 at 08:57:16PM +0800, Kunkun Jiang wrote: > Starting from pss->page, ram_save_host_page() will check every page > and send the dirty pages up to the end of the current host page or > the boundary of used_length of the block. If the host page size is > a huge page, the step "check" will take a lot of time. > > It will improve performance to use migration_bitmap_find_dirty(). > > Tested on Kunpeng 920; VM parameters: 1U 4G (page size 1G) > The time of ram_save_host_page() in the last round of ram saving: > before optimize: 9250us after optimize: 34us > > Signed-off-by: Keqian Zhu <zhukeqi...@huawei.com> > Signed-off-by: Kunkun Jiang <jiangkun...@huawei.com>
Reviewed-by: Peter Xu <pet...@redhat.com> Thanks, -- Peter Xu
