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From: Kunkun Jiang <jiangkunkun@huawei.com>
To: "David Edmondson" <dme@dme.org>, "Peter Xu" <peterx@redhat.com>,
	"Juan Quintela" <quintela@redhat.com>,
	"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
	"Andrey Gruzdev" <andrey.gruzdev@virtuozzo.com>,
	"Cédric Le Goater" <clg@kaod.org>,
	"Alexey Romko" <nevilad@yahoo.com>,
	"open list:All patches CC here" <qemu-devel@nongnu.org>
Cc: Zenghui Yu <yuzenghui@huawei.com>,
	wanghaibin.wang@huawei.com, Keqian Zhu <zhukeqian1@huawei.com>
Subject: [PATCH v4 1/2] migration/ram: Reduce unnecessary rate limiting
Date: Tue, 16 Mar 2021 20:57:15 +0800	[thread overview]
Message-ID: <20210316125716.1243-2-jiangkunkun@huawei.com> (raw)
In-Reply-To: <20210316125716.1243-1-jiangkunkun@huawei.com>

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



  reply	other threads:[~2021-03-16 12:59 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-16 12:57 [PATCH v4 0/2] Some modification about ram_save_host_page() Kunkun Jiang
2021-03-16 12:57 ` Kunkun Jiang [this message]
2021-03-16 21:39   ` [PATCH v4 1/2] migration/ram: Reduce unnecessary rate limiting Peter Xu
2021-03-17  1:37     ` Kunkun Jiang
2021-03-17 10:43       ` David Edmondson
2021-03-17 12:05       ` Dr. David Alan Gilbert
2021-03-16 12:57 ` [PATCH v4 2/2] migration/ram: Optimize ram_save_host_page() Kunkun Jiang
2021-03-16 21:39   ` Peter Xu
2021-04-06 13:19 ` [PATCH v4 0/2] Some modification about ram_save_host_page() Kunkun Jiang
2021-04-06 17:14   ` Dr. David Alan Gilbert
2021-04-07  9:32     ` Kunkun Jiang
2021-05-11  9:17 ` Dr. David Alan Gilbert

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