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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>
This commit is contained in:
Kunkun Jiang 2021-03-16 20:57:15 +08:00 committed by Dr. David Alan Gilbert
parent 1a37352277
commit 23feba906e
1 changed files with 7 additions and 2 deletions
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9
migration/ram.c
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@ -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));