Het Gala <het.gala@nutanix.com> writes:
On 18/07/22 8:03 pm, Markus Armbruster wrote:
Het Gala <het.gala@nutanix.com> writes:
On 18/07/22 2:05 pm, Markus Armbruster wrote:
Het Gala <het.gala@nutanix.com> writes:
i) Modified the format of the qemu monitor command : 'migrate' by adding a list,
each element in the list consists of multi-FD connection parameters:
source
and destination uris and of the number of multi-fd channels between each
pair.
ii) Information of all multi-FD connection parameters’ list, length of the list
and total number of multi-fd channels for all the connections together
is
stored in ‘OutgoingArgs’ struct.
Suggested-by: Manish Mishra <manish.mishra@nutanix.com>
Signed-off-by: Het Gala <het.gala@nutanix.com>
---
[...]
diff --git a/migration/socket.c b/migration/socket.c
index 4fd5e85f50..7ca6af8cca 100644
--- a/migration/socket.c
+++ b/migration/socket.c
@@ -32,6 +32,17 @@ struct SocketOutgoingArgs {
SocketAddress *saddr;
} outgoing_args;
+struct SocketArgs {
+ struct SrcDestAddr data;
+ uint8_t multifd_channels;
+};
+
+struct OutgoingMigrateParams {
+ struct SocketArgs *socket_args;
+ size_t length;
Length of what?
length of the socket_args[] array. Thanks for pointing it out. I will
be more specific for this variable in the v2 patchset series.
+ uint64_t total_multifd_channel;
@total_multifd_channels appears to be the sum of the
socket_args[*].multifd_channels. Correct?
Yes Markus, you are correct.
Sure you need to keep the sum separately?
So earlier, the idea behind this was that, we had this intention to depreciate
the migrate_multifd_channels() API from the live migration
process. We made total_multifd_channels() function, where it used to calculate
total number of multifd channels every time, for whichever
function called was computation internsive so we replaced it by returning sum
of socket_args[*].multifd_channels i.e.
total_multifd_channel in the later patches.
But now in the v2 patchset onwards, Thanks to inputs from Dr. David and
Daniel, we are not depricating migrate_multifd_channels() API but
the value from the API will be cross-referenced with sum of
socket_args[*].multifd_channels i.e. total_multifd_channel, and error if
they are not equal.
I'm afraid I don't understand. I'm not sure I have to. Let me loop
back to my question.
If @total_multifd_channel is always the sum of the
socket_args[*].multifd_channels, then you can always compute it on the
fly.
I.e. you can replace @total_multifd_channel by a function that returns
the sum.
Precomputing it instead is more complex, because then you need to
document that the two are the same. Also, bug oppertunity: letting them
deviate somehow. I figure that's worthwhile only if computing on the
fly is too expensive.
Okay, I understand your concern. I am okay with your approach too, but these
things are not expected to change out of qmp command context.