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Re: [for-6.1 4/4] virtio-scsi: Configure all host notifiers in a single
From: |
Stefan Hajnoczi |
Subject: |
Re: [for-6.1 4/4] virtio-scsi: Configure all host notifiers in a single MR transaction |
Date: |
Wed, 5 May 2021 11:17:33 +0100 |
On Wed, Apr 07, 2021 at 04:35:01PM +0200, Greg Kurz wrote:
> This allows the virtio-scsi-pci device to batch the setup of all its
> host notifiers. This significantly improves boot time of VMs with a
> high number of vCPUs, e.g. from 6m5.563s down to 1m2.884s for a
> pseries machine with 384 vCPUs.
>
> Note that memory_region_transaction_commit() must be called before
> virtio_bus_cleanup_host_notifier() because the latter might close
> ioeventfds that the transaction still assumes to be around when it
> commits.
>
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---
> hw/scsi/virtio-scsi-dataplane.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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