Re: [Qemu-devel] [PATCH 49/59] ram: Remember last_page instead of last_offset

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

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

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

> ---
>  migration/ram.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/migration/ram.c b/migration/ram.c
> index 52ab14b..5b2045d 100644
> --- a/migration/ram.c
> +++ b/migration/ram.c
> @@ -171,8 +171,8 @@ struct RAMState {
>      RAMBlock *last_seen_block;
>      /* Last block from where we have sent data */
>      RAMBlock *last_sent_block;
> -    /* Last offset we have sent data from */
> -    ram_addr_t last_offset;
> +    /* Last dirty targe page we have sent */
> +    ram_addr_t last_page;
>      /* last ram version we have seen */
>      uint32_t last_version;
>      /* We are in the first round */
> @@ -1061,7 +1061,7 @@ static bool find_dirty_block(RAMState *rs, PageSearchStatus *pss,
>      pss->offset = migration_bitmap_find_dirty(rs, pss->block, pss->offset,
>                                                page_abs);
>      if (pss->complete_round && pss->block == rs->last_seen_block &&
> -        pss->offset >= rs->last_offset) {
> +        (pss->offset >> TARGET_PAGE_BITS) >= rs->last_page) {
>          /*
>           * We've been once around the RAM and haven't found anything.
>           * Give up.
> @@ -1402,7 +1402,7 @@ static int ram_find_and_save_block(RAMState *rs, bool last_stage)
>      }
>  
>      pss.block = rs->last_seen_block;
> -    pss.offset = rs->last_offset;
> +    pss.offset = rs->last_page << TARGET_PAGE_BITS;
>      pss.complete_round = false;
>  
>      if (!pss.block) {
> @@ -1424,7 +1424,7 @@ static int ram_find_and_save_block(RAMState *rs, bool last_stage)
>      } while (!pages && again);
>  
>      rs->last_seen_block = pss.block;
> -    rs->last_offset = pss.offset;
> +    rs->last_page = pss.offset >> TARGET_PAGE_BITS;
>  
>      return pages;
>  }
> @@ -1499,7 +1499,7 @@ static void ram_state_reset(RAMState *rs)
>  {
>      rs->last_seen_block = NULL;
>      rs->last_sent_block = NULL;
> -    rs->last_offset = 0;
> +    rs->last_page = 0;
>      rs->last_version = ram_list.version;
>      rs->ram_bulk_stage = true;
>  }
> @@ -1844,7 +1844,7 @@ static int postcopy_chunk_hostpages(MigrationState *ms)
>      /* Easiest way to make sure we don't resume in the middle of a host-page */
>      rs->last_seen_block = NULL;
>      rs->last_sent_block = NULL;
> -    rs->last_offset     = 0;
> +    rs->last_page = 0;
>  
>      QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
>          unsigned long first = block->offset >> TARGET_PAGE_BITS;
> -- 
> 2.9.3
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK