Rik van Riel wrote:
> 
> On Sun, 27 May 2001, Manfred Spraul wrote:
> 
> > >          if (z->free_pages < z->pages_min / 4 &&
> > > -           !(current->flags & PF_MEMALLOC))
> > > +            (in_interrupt() || !(current->flags & PF_MEMALLOC)))
> > >             continue;
> >
> > It's 'if (in_interrupt()) continue', not 'if (in_interrupt()) alloc'.
> > Currently a network card can allocate the last few pages if the
> > interrupt occurs in the context of the PF_MEMALLOC thread. I think
> > PF_MEMALLOC memory should never be available to interrupt handlers.
> 
> You're right, my mistake.
>
Ok, then the attached patch should be ok [SMP safe 'memory_pressure--' +
the change above].

I've moved the modified memory_pressure calculation into my 'not_now'
folder - not enough time for proper testing, and the change definitively
needs thorough testing.

We should take into account that the current page owner can reactivage a
page, i.e. nr_inactive_{dirty,clean}_pages overestimates the number of
really inactive pages in these lists.

My modified memory_pressure calculation would be one way to implement
that.

--
	Manfred