> > some ports use pmap_kenter_pa rather than pmap_enter for vmapbuf.
> 
> sure, but physio also uses uvm_vslock(), which always ends up using
> pmap_enter() with VM_PROT_WRITE in the flags if we're modifying the page,
> so the modified bit will be set at that point.
> 
> -Chuck

i see.  thanks for explanation.

YAMAMOTO Takashi