Re: [Xen-devel] Regarding page table management changes from Xen v1 to Xen v2 (and v3)

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 26 Apr 2006, at 18:56, Himanshu Raj wrote:

> In another example, mmapped access to a file, the new approach will 
> incur these
> two extra faults for every page fault required to bring a file page to 
> page cache,
> right?
All the common non-batched paths (i.e., demand faults) use 
update_va_mapping(), so do a single fast hypercall.
> Could you tell me another example other than fork when one can use 
> batched PTE
> modifications.
fork() is the only one for us these days. All others use 
update_va_mapping(), act on pagetables that aren't pinned (so the guest 
can directly update them without faulting) or are infrequent enough we 
do not care.
 -- Keir


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