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[PATCH v4 1/2] migration/ram: Reduce unnecessary rate limiting
From: |
Kunkun Jiang |
Subject: |
[PATCH v4 1/2] migration/ram: Reduce unnecessary rate limiting |
Date: |
Tue, 16 Mar 2021 20:57:15 +0800 |
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 <zhukeqian1@huawei.com>
Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
Reviewed-by: David Edmondson <david.edmondson@oracle.com>
---
migration/ram.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/migration/ram.c b/migration/ram.c
index 72143da0ac..3eb5b0d7a7 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2015,8 +2015,13 @@ 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));
--
2.23.0