Re: [Qemu-devel] [PATCH 05/12] arch_init: introduce ram_save_local()

["Michael R. Hines" <mrhines@linux.vnet.ibm.com>]

On 07/25/2013 04:18 PM, Lei Li wrote:
> Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
> ---
>   arch_init.c |   32 ++++++++++++++++++++++++++++++++
>   1 files changed, 32 insertions(+), 0 deletions(-)
>
> diff --git a/arch_init.c b/arch_init.c
> index a418071..7eeb52f 100644
> --- a/arch_init.c
> +++ b/arch_init.c
> @@ -757,6 +757,38 @@ static int ram_page_save(QEMUFile *f)
>       return bytes_sent;
>   }
>
> +static int ram_save_local(QEMUFile *f, void *opaque)
> +{
> +    uint64_t bytes_sent = 0;
> +    uint64_t total_ram_bytes = ram_bytes_total();
> +
> +    qemu_mutex_lock_ramlist();
> +
> +    while (total_ram_bytes) {
> +       void *ram;
> +       MemoryRegion *mr;
> +
> +       bytes_sent = ram_page_save(f);
> +       /* No more ram pages. */
> +       if (bytes_sent == 0) {
> +           return bytes_sent;
> +       }
> +
> +       mr = last_block_local->mr;
> +       ram = memory_region_get_ram_ptr(mr) + last_offset_local;
> +
> +       /* DONTNEED the ram page that has already copied. */
> +       qemu_madvise(ram, bytes_sent, QEMU_MADV_DONTNEED);
> +       total_ram_bytes -= bytes_sent;
> +    }
> +
> +    qemu_mutex_unlock_ramlist();
> +
> +    qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
> +
> +    return bytes_sent;
> +}
> +
>   static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host)
>   {
>       int ret, rc = 0;

You need to create a new private structure "QEMUFileLocal".

Then override f->save_page and point this to your own function.

See migration-rdma.c for an example.

- Michael