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| 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 /include/exec/memory.h | |
| parent | 41ddcd2308f76cc95459c2961f4a50b66a70d3c4 (diff) | |
| download | focaccia-qemu-544cff46c018036cd66e98ffb224dd9f098065c8.tar.gz focaccia-qemu-544cff46c018036cd66e98ffb224dd9f098065c8.zip | |
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 'include/exec/memory.h')
| -rw-r--r-- | include/exec/memory.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/exec/memory.h b/include/exec/memory.h index cc68249eda..ef23d65afc 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -1095,6 +1095,7 @@ struct AddressSpace { struct FlatView *current_map; int ioeventfd_nb; + int ioeventfd_notifiers; struct MemoryRegionIoeventfd *ioeventfds; QTAILQ_HEAD(, MemoryListener) listeners; QTAILQ_ENTRY(AddressSpace) address_spaces_link; |