Re: [PATCH 5/6] KVM MMU: reduce kvm_mmu_page size

[Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>]

Avi Kivity wrote:
> On 04/12/2010 11:05 AM, Xiao Guangrong wrote:
>> 'multimapped' and 'unsync' in 'struct kvm_mmu_page' are just indication
>> field, we can use flag bits instand of them
>>
>> @@ -202,9 +202,10 @@ struct kvm_mmu_page {
>>        * in this shadow page.
>>        */
>>       DECLARE_BITMAP(slot_bitmap, KVM_MEMORY_SLOTS +
>> KVM_PRIVATE_MEM_SLOTS);
>> -    int multimapped;         /* More than one parent_pte? */
>>       int root_count;          /* Currently serving as active root */
>> -    bool unsync;
>> +    #define MMU_PAGE_MULTIMAPPED 0x1        /* More than one
>> parent_pte? */
>> +    #define MMU_PAGE_UNSYNC 0x2
>> +    unsigned int flags;
>>       unsigned int unsync_children;
>>       union {
>>    
> 
> Please just use bool for multimapped.  If we grow more than 4 flags, we
> can use 'bool flag : 1;' to reduce space while retaining readability.
> 

Yeah, good idea, i'll fix it in the next version

Thanks,
Xiao