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Re: [PATCH v1 4/4] migration/multifd: Move load_cleanup inside incoming_
From: |
Juan Quintela |
Subject: |
Re: [PATCH v1 4/4] migration/multifd: Move load_cleanup inside incoming_state_destroy |
Date: |
Fri, 10 Feb 2023 13:51:27 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) |
Leonardo Bras <leobras@redhat.com> wrote:
> Currently running migration_incoming_state_destroy() without first running
> multifd_load_cleanup() will cause a yank error:
>
> qemu-system-x86_64: ../util/yank.c:107: yank_unregister_instance:
> Assertion `QLIST_EMPTY(&entry->yankfns)' failed.
> (core dumped)
>
> The above error happens in the target host, when multifd is being used
> for precopy, and then postcopy is triggered and the migration finishes.
> This will crash the VM in the target host.
>
> To avoid that, move multifd_load_cleanup() inside
> migration_incoming_state_destroy(), so that the load cleanup becomes part
> of the incoming state destroying process.
>
> Running multifd_load_cleanup() twice can become an issue, though, but the
> only scenario it could be ran twice is on process_incoming_migration_bh().
> So removing this extra call is necessary.
>
> On the other hand, this multifd_load_cleanup() call happens way before the
> migration_incoming_state_destroy() and having this happening before
> dirty_bitmap_mig_before_vm_start() and vm_start() may be a need.
>
> So introduce a new function multifd_load_shutdown() that will mainly stop
> all multifd threads and close their QIOChannels. Then use this function
> instead of multifd_load_cleanup() to make sure nothing else is received
> before dirty_bitmap_mig_before_vm_start().
>
> Signed-off-by: Leonardo Bras <leobras@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
- Re: [PATCH v1 1/4] migration/multifd: Change multifd_load_cleanup() signature and usage, (continued)
- Re: [PATCH v1 1/4] migration/multifd: Change multifd_load_cleanup() signature and usage, Leonardo Brás, 2023/02/10
- [PATCH v1 1/4] migration/multifd: Change multifd_load_cleanup() signature and usage, Leonardo Bras, 2023/02/10
- [PATCH v1 2/4] migration/multifd: Remove unnecessary assignment on multifd_load_cleanup(), Leonardo Bras, 2023/02/10
- [PATCH v1 3/4] migration/multifd: Join all multifd threads in order to avoid leaks, Leonardo Bras, 2023/02/10
- [PATCH v1 4/4] migration/multifd: Move load_cleanup inside incoming_state_destroy, Leonardo Bras, 2023/02/10
- Re: [PATCH v1 1/4] migration/multifd: Change multifd_load_cleanup() signature and usage, Juan Quintela, 2023/02/10
- Re: [PATCH v1 1/4] migration/multifd: Change multifd_load_cleanup() signature and usage, Peter Xu, 2023/02/10