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authorKunkun Jiang <jiangkunkun@huawei.com>2021-03-16 20:57:15 +0800
committerDr. David Alan Gilbert <dgilbert@redhat.com>2021-05-13 18:21:13 +0100
commit23feba906e42747463aa233fb54c58d7f02430c9 (patch)
treeee1fb3534404923f15cccb29061fe78792d5758a /migration
parent1a37352277763220739290c689867540ec193d06 (diff)
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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 <zhukeqian1@huawei.com> Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com> Reviewed-by: David Edmondson <david.edmondson@oracle.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <20210316125716.1243-2-jiangkunkun@huawei.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Diffstat (limited to 'migration')
-rw-r--r--migration/ram.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/migration/ram.c b/migration/ram.c
index bee2756..00b579b 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));