diff options
| author | hongmianquan <hongmianquan@bytedance.com> | 2023-08-30 11:29:06 +0800 |
|---|---|---|
| committer | David Hildenbrand <david@redhat.com> | 2023-09-19 10:44:44 +0200 |
| commit | 544cff46c018036cd66e98ffb224dd9f098065c8 (patch) | |
| tree | 477137c59ce1112578104f1735c67c51c8d94689 /qapi | |
| parent | 41ddcd2308f76cc95459c2961f4a50b66a70d3c4 (diff) | |
| download | qemu-544cff46c018036cd66e98ffb224dd9f098065c8.zip qemu-544cff46c018036cd66e98ffb224dd9f098065c8.tar.gz qemu-544cff46c018036cd66e98ffb224dd9f098065c8.tar.bz2 | |
memory: avoid updating ioeventfds for some address_space
When updating ioeventfds, we need to iterate all address spaces,
but some address spaces do not register eventfd_add|del call when
memory_listener_register() and they do nothing when updating ioeventfds.
So we can skip these AS in address_space_update_ioeventfds().
The overhead of memory_region_transaction_commit() can be significantly
reduced. For example, a VM with 8 vhost net devices and each one has
64 vectors, can reduce the time spent on memory_region_transaction_commit by 20%.
Message-ID: <20230830032906.12488-1-hongmianquan@bytedance.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: hongmianquan <hongmianquan@bytedance.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Diffstat (limited to 'qapi')
0 files changed, 0 insertions, 0 deletions