在 2023/7/27 8:53 下午, Peter Xu 写道:
On Thu, Jul 27, 2023 at 11:59:43AM +0800, hongmainquan wrote:
在 2023/7/27 1:45 上午, Peter Xu 写道:
On Tue, Jul 25, 2023 at 07:20:37PM +0800, hongmianquan wrote:
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%.
Signed-off-by: hongmianquan <hongmianq...@bytedance.com>
Reviewed-by: Peter Xu <pet...@redhat.com>
Should be for 8.2, though. Please always copy Paolo for memory related
patches. I hope Paolo can see this.
Thanks, I hope so. Also, I'm not quite sure what 'Should be for 8.2' means.
Does it imply that there will be changes to this logic after version 8.2?
See:
https://wiki.qemu.org/Planning/8.1
We're already right before 8.1-rc2 release, perf patch isn't normally the
target of this phase.
Thanks,
Understood. Hope for some suggestions from you.
Thanks!
