* Juan Quintela (quint...@redhat.com) wrote:
> So we use multifd to transmit zero pages.
>
> Signed-off-by: Juan Quintela <quint...@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
>
> ---
>
> - Check zero_page property before using new code (Dave)
> ---
> migration/ram.c | 33 ++++++++++++++++++++++++++++++++-
> 1 file changed, 32 insertions(+), 1 deletion(-)
>
> diff --git a/migration/ram.c b/migration/ram.c
> index 7ceef7976b..f9959262fa 100644
> --- a/migration/ram.c
> +++ b/migration/ram.c
> @@ -2181,6 +2181,32 @@ static int ram_save_target_page_legacy(RAMState *rs,
> PageSearchStatus *pss)
> return ram_save_page(rs, pss);
> }
>
> +/**
> + * ram_save_target_page_multifd: save one target page
> + *
> + * Returns the number of pages written
> + *
> + * @rs: current RAM state
> + * @pss: data about the page we want to send
> + */
> +static int ram_save_target_page_multifd(RAMState *rs, PageSearchStatus *pss)
> +{
> + RAMBlock *block = pss->block;
> + ram_addr_t offset = ((ram_addr_t)pss->page) << TARGET_PAGE_BITS;
> + int res;
> +
> + if (!migration_in_postcopy()) {
> + return ram_save_multifd_page(rs, block, offset);
> + }
> +
> + res = save_zero_page(rs, block, offset);
> + if (res > 0) {
> + return res;
> + }
> +
> + return ram_save_page(rs, pss);
> +}
> +
> /**
> * ram_save_host_page: save a whole host page
> *
> @@ -2945,7 +2971,12 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
> ram_control_before_iterate(f, RAM_CONTROL_SETUP);
> ram_control_after_iterate(f, RAM_CONTROL_SETUP);
>
> - (*rsp)->ram_save_target_page = ram_save_target_page_legacy;
> + if (migrate_use_multifd() && migrate_use_multifd_zero_page()) {
> + (*rsp)->ram_save_target_page = ram_save_target_page_multifd;
> + } else {
> + (*rsp)->ram_save_target_page = ram_save_target_page_legacy;
> + }
> +
> ret = multifd_send_sync_main(f);
> if (ret < 0) {
> return ret;
> --
> 2.35.3
>
--
Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
