On Fri, 2005-May-20 15:56:15 -0700, Don Lewis wrote: >On 21 May, Peter Jeremy wrote: >> On Fri, 2005-May-20 21:51:34 +0200, Hans Petter Selasky wrote: > >>>Can anyone explain why "uiomove()" has to sleep, and why there is no >>>non-blocking "uiomove()"? >> >> As far as I can see, uiomove() only sleeps if it is asked to do a >> kernel<->userland move that takes more than twice a scheduler quantum. >> As long as you don't uiomove() ridiculous amounts of data, it should >> never sleep. > >It can also sleep if it stumbles across a userland page that isn't >resident. When this happens, it will sleep until the page is retrieved >from swap.
Mea culpa. I thought pcb_onfault was invoked in lieu of paging but it's actually invoked after the pager has tried to bring the page in. -- Peter Jeremy _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
