RE: Copy-on-Write

["Rajat Jain" <Rajat.Jain@xxxxxxxxxxxx>]

Hi,

>> 
>> I had read that the operating systems that use copy-on-write
>> mechanism for fork(), it is better if they deliberately allow the
>> CHILD to run first. 
>> 
>> This would be better because in 99% of the cases child will call
>> exec() and the new address space will be allocated. Instead if the
>> parent is executes first, an unnecessary copy of the pages is made
>> (if parents writes) and later on when child executes, a fresh
>> address space is executed. 
>> 
>> So in linux, is a child run first or the parent? Can we rely on this
>> information?
> 
> No with fork() it is not guaranteed.......however if you use vfork()
> child is guaranteed to run first......
> 

So as the author says, isn't running child first a good idea that needs to be implemented?

Thanks,

Rajat

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