Re: [cp-patches] RFC: misc NIO fixes

[Casey Marshall]

On Jul 21, 2005, at 3:04 PM, Mark Wielaard wrote:


> Hi,
>
> On Tue, 2005-07-19 at 09:12 -0500, Archie Cobbs wrote:
>
>
> > Casey Marshall wrote:
> >
> >
> > > Attached is a patch I'd like to get some comments on, before I  
> > > check  it
> > > in, especially if anyone can spot holes in my C. This patch
> >
> > +  /* FIXME: I'd bet dollars for donuts the compiler optimizes this
> > +     away. How can we load memory into core??? */
> > +  for (i = 0; i < size; i += pagesize)
> > +    {
> > +      foo += ((int *) address)[i];
> > +    }
> >   }
> >
> > You can force the memory to be accessed e.g. like this:
> >
> >    for (i = 0; ... )
> >       *((volatile int *)address + i;
>
> If the system has madvise you probably get the requested functionality
> with madvise(address, size, MADV_WILLNEED).

Aha! Yes, I had thought there was a function that did that. Thanks  
for the reminder, Mark.