Re: [PATCH v3 02/23] migration: Never call twice qemu_target_page_size()

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Juan Quintela (quintela@redhat.com) wrote:
> Signed-off-by: Juan Quintela <quintela@redhat.com>

OK, not much difference

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

> ---
>  migration/migration.c | 7 ++++---
>  migration/multifd.c   | 7 ++++---
>  migration/savevm.c    | 5 +++--
>  3 files changed, 11 insertions(+), 8 deletions(-)
> 
> diff --git a/migration/migration.c b/migration/migration.c
> index 2c1edb2cb9..3de11ae921 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -996,6 +996,8 @@ static void populate_time_info(MigrationInfo *info, MigrationState *s)
>  
>  static void populate_ram_info(MigrationInfo *info, MigrationState *s)
>  {
> +    size_t page_size = qemu_target_page_size();
> +
>      info->has_ram = true;
>      info->ram = g_malloc0(sizeof(*info->ram));
>      info->ram->transferred = ram_counters.transferred;
> @@ -1004,12 +1006,11 @@ static void populate_ram_info(MigrationInfo *info, MigrationState *s)
>      /* legacy value.  It is not used anymore */
>      info->ram->skipped = 0;
>      info->ram->normal = ram_counters.normal;
> -    info->ram->normal_bytes = ram_counters.normal *
> -        qemu_target_page_size();
> +    info->ram->normal_bytes = ram_counters.normal * page_size;
>      info->ram->mbps = s->mbps;
>      info->ram->dirty_sync_count = ram_counters.dirty_sync_count;
>      info->ram->postcopy_requests = ram_counters.postcopy_requests;
> -    info->ram->page_size = qemu_target_page_size();
> +    info->ram->page_size = page_size;
>      info->ram->multifd_bytes = ram_counters.multifd_bytes;
>      info->ram->pages_per_second = s->pages_per_second;
>  
> diff --git a/migration/multifd.c b/migration/multifd.c
> index 7c9deb1921..8125d0015c 100644
> --- a/migration/multifd.c
> +++ b/migration/multifd.c
> @@ -289,7 +289,8 @@ static void multifd_send_fill_packet(MultiFDSendParams *p)
>  static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
>  {
>      MultiFDPacket_t *packet = p->packet;
> -    uint32_t pages_max = MULTIFD_PACKET_SIZE / qemu_target_page_size();
> +    size_t page_size = qemu_target_page_size();
> +    uint32_t pages_max = MULTIFD_PACKET_SIZE / page_size;
>      RAMBlock *block;
>      int i;
>  
> @@ -358,14 +359,14 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
>      for (i = 0; i < p->pages->used; i++) {
>          uint64_t offset = be64_to_cpu(packet->offset[i]);
>  
> -        if (offset > (block->used_length - qemu_target_page_size())) {
> +        if (offset > (block->used_length - page_size)) {
>              error_setg(errp, "multifd: offset too long %" PRIu64
>                         " (max " RAM_ADDR_FMT ")",
>                         offset, block->used_length);
>              return -1;
>          }
>          p->pages->iov[i].iov_base = block->host + offset;
> -        p->pages->iov[i].iov_len = qemu_target_page_size();
> +        p->pages->iov[i].iov_len = page_size;
>      }
>  
>      return 0;
> diff --git a/migration/savevm.c b/migration/savevm.c
> index d59e976d50..0bef031acb 100644
> --- a/migration/savevm.c
> +++ b/migration/savevm.c
> @@ -1685,6 +1685,7 @@ static int loadvm_postcopy_handle_advise(MigrationIncomingState *mis,
>  {
>      PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_ADVISE);
>      uint64_t remote_pagesize_summary, local_pagesize_summary, remote_tps;
> +    size_t page_size = qemu_target_page_size();
>      Error *local_err = NULL;
>  
>      trace_loadvm_postcopy_handle_advise();
> @@ -1741,13 +1742,13 @@ static int loadvm_postcopy_handle_advise(MigrationIncomingState *mis,
>      }
>  
>      remote_tps = qemu_get_be64(mis->from_src_file);
> -    if (remote_tps != qemu_target_page_size()) {
> +    if (remote_tps != page_size) {
>          /*
>           * Again, some differences could be dealt with, but for now keep it
>           * simple.
>           */
>          error_report("Postcopy needs matching target page sizes (s=%d d=%zd)",
> -                     (int)remote_tps, qemu_target_page_size());
> +                     (int)remote_tps, page_size);
>          return -1;
>      }
>  
> -- 
> 2.33.1
> 
-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK