Re: [Qemu-devel] [PATCH v3] migratioin/ram: leave RAMBlock->bmap blank on allocating

[Wei Yang <richardw.yang@linux.intel.com>]

On Tue, Jun 04, 2019 at 03:06:14PM +0800, Peter Xu wrote:
>On Tue, Jun 04, 2019 at 02:17:27PM +0800, Wei Yang wrote:
>> During migration, we would sync bitmap from ram_list.dirty_memory to
>> RAMBlock.bmap in cpu_physical_memory_sync_dirty_bitmap().
>> 
>> Since we set RAMBlock.bmap and ram_list.dirty_memory both to all 1, this
>> means at the first round this sync is meaningless and is a duplicated
>> work.
>> 
>> Leaving RAMBlock->bmap blank on allocating would have a side effect on
>> migration_dirty_pages, since it is calculated from the result of
>> cpu_physical_memory_sync_dirty_bitmap(). To keep it right, we need to
>> set migration_dirty_pages to 0 in ram_state_init().
>> 
>> Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
>> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
>
>Thanks for updating the comments.
>

My pleasure :-)

>Acked-by: Peter Xu <peterx@redhat.com>
>
>-- 
>Peter Xu

-- 
Wei Yang
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