On Thu, Aug 11, 2005 at 03:04:29PM +0100, Hugh Dickins wrote: > On Thu, 11 Aug 2005, Gleb Natapov wrote: > > What about the idea that was floating around about new VM flag that will > > instruct kernel to copy pages belonging to the vma on fork instead of mark > > them as cow? > > It's a pretty good idea, and thanks for reminding us of it. > > It suffers from the general difficulty with fixes within get_user_pages, > that we need down_write(&mm->mmap_sem) to split_vma, and even just to > update vm_flags, whereas get_user_pages is entered with down_read. > Why do it form get_user_pages? Lets use madvise/mprotect interface. Program can mrpotect(VM_COPYONFORK) address range before registering it. -- Gleb. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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