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[Qemu-devel] [PATCH v6 04/11] migration: Stop rdma yielding during incom
From: |
Lidong Chen |
Subject: |
[Qemu-devel] [PATCH v6 04/11] migration: Stop rdma yielding during incoming postcopy |
Date: |
Mon, 6 Aug 2018 21:29:30 +0800 |
From: Lidong Chen <address@hidden>
During incoming postcopy, the destination qemu will invoke
qemu_rdma_wait_comp_channel in a seprate thread. So does not use rdma
yield, and poll the completion channel fd instead.
Signed-off-by: Lidong Chen <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
---
migration/rdma.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/migration/rdma.c b/migration/rdma.c
index a5535fb..cfb0671 100644
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -1493,11 +1493,13 @@ static int qemu_rdma_wait_comp_channel(RDMAContext
*rdma)
* Coroutine doesn't start until migration_fd_process_incoming()
* so don't yield unless we know we're running inside of a coroutine.
*/
- if (rdma->migration_started_on_destination) {
+ if (rdma->migration_started_on_destination &&
+ migration_incoming_get_current()->state == MIGRATION_STATUS_ACTIVE) {
yield_until_fd_readable(rdma->comp_channel->fd);
} else {
/* This is the source side, we're in a separate thread
* or destination prior to migration_fd_process_incoming()
+ * after postcopy, the destination also in a seprate thread.
* we can't yield; so we have to poll the fd.
* But we need to be able to handle 'cancel' or an error
* without hanging forever.
--
1.8.3.1
- [Qemu-devel] [PATCH v6 00/11] Enable postcopy RDMA live migration, Lidong Chen, 2018/08/06
- [Qemu-devel] [PATCH v6 01/11] migration: disable RDMA WRITE after postcopy started, Lidong Chen, 2018/08/06
- [Qemu-devel] [PATCH v6 02/11] migration: create a dedicated connection for rdma return path, Lidong Chen, 2018/08/06
- [Qemu-devel] [PATCH v6 04/11] migration: Stop rdma yielding during incoming postcopy,
Lidong Chen <=
- [Qemu-devel] [PATCH v6 06/11] migration: invoke qio_channel_yield only when qemu_in_coroutine(), Lidong Chen, 2018/08/06
- [Qemu-devel] [PATCH v6 03/11] migration: implement bi-directional RDMA QIOChannel, Lidong Chen, 2018/08/06
- [Qemu-devel] [PATCH v6 07/11] migration: poll the cm event while wait RDMA work request completion, Lidong Chen, 2018/08/06
- [Qemu-devel] [PATCH v6 05/11] migration: implement io_set_aio_fd_handler function for RDMA QIOChannel, Lidong Chen, 2018/08/06
- [Qemu-devel] [PATCH v6 08/11] migration: implement the shutdown for RDMA QIOChannel, Lidong Chen, 2018/08/06