From: Kunkun Jiang Date: Tue, 16 Mar 2021 12:57:15 +0000 (+0800) Subject: migration/ram: Reduce unnecessary rate limiting X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=23feba906e42747463aa233fb54c58d7f02430c9;p=qemu.git migration/ram: Reduce unnecessary rate limiting When the host page is a huge page and something is sent in the current iteration, migration_rate_limit() should be executed. If not, it can be omitted. Signed-off-by: Keqian Zhu Signed-off-by: Kunkun Jiang Reviewed-by: David Edmondson Reviewed-by: Dr. David Alan Gilbert Message-Id: <20210316125716.1243-2-jiangkunkun@huawei.com> Signed-off-by: Dr. David Alan Gilbert --- diff --git a/migration/ram.c b/migration/ram.c index bee2756cd3..00b579b981 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2035,8 +2035,13 @@ static int ram_save_host_page(RAMState *rs, PageSearchStatus *pss, pages += tmppages; pss->page++; - /* Allow rate limiting to happen in the middle of huge pages */ - migration_rate_limit(); + /* + * Allow rate limiting to happen in the middle of huge pages if + * something is sent in the current iteration. + */ + if (pagesize_bits > 1 && tmppages > 0) { + migration_rate_limit(); + } } while ((pss->page & (pagesize_bits - 1)) && offset_in_ramblock(pss->block, ((ram_addr_t)pss->page) << TARGET_PAGE_BITS));