Nick Piggin writes:
[...]
> > +/*
> > + * We check to see no part of the vm is busy. If it is this will interrupt
> > + * trickle_swap and wait another PREFETCH_DELAY. Purposefully racy.
> > + */
> > +inline void delay_swap_prefetch(void)
> > +{
> > + __set_bit(0, &swapped.busy);
> > +}
> > +
>
> Test this first so you don't bounce the cacheline around in page
> reclaim too much.
Shouldn't we have special macros/inlines for this? Like, e.g.,
static inline void __set_bit_weak(int nr, volatile unsigned long * addr)
{
if (!__test_bit(nr, addr))
__set_bit(nr, addr);
}
? These test-then-set sequences start to proliferate throughout the code.
[...]
Nikita.
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