On Wed, Jul 25, 2007 at 11:50:37PM -0700, Andrew Morton wrote:
> On Wed, 25 Jul 2007 23:33:24 -0700 "Ray Lee" <[email protected]> wrote:
>
> > > So. We can
> > >
> > > a) provide a way for userspace to reload pagecache and
> > >
> > > b) merge maps2 (once it's finished) (pokes mpm)
> > >
> > > and we're done?
> >
> > Eh, dunno. Maybe?
> >
> > We're assuming we come up with an API for userspace to get
> > notifications of evictions (without polling, though poll() would be
> > fine -- you know what I mean), and an API for re-victing those things
> > on demand.
>
> I was assuming that polling would work OK. I expect it would.
>
> > If you think that adding that API and maintaining it is
> > simpler/better than including a variation on the above hueristic I
> > offered, then yeah, I guess we are. It'll all have that vague
> > userspace s2ram odor about it, but I'm sure it could be made to work.
>
> Actually, I overdesigned the API, I suspect. What we _could_ do is to
> provide a way of allowing userspace to say "pretend process A touched page
> B": adopt its mm and go touch the page. We in fact already have that:
> PTRACE_PEEKTEXT.
>
> So I suspect this could all be done by polling maps2 and using PEEKTEXT.
> The tricky part would be working out when to poll, and when to reestablish.
>
> A neater implementation than PEEKTEXT would be to make the maps2 files
> writeable(!) so as a party trick you could tar 'em up and then, when you
> want to reestablish firefox's previous working set, do a untar in
> /proc/$(pidof firefox)/
Sick. But thankfully, unnecessary. The pagemaps give you more than
just a present bit, which is all we care about here. We simply need to
record which pages are mapped, then reference them all back to life..
--
Mathematics is the supreme nostalgia of our time.
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