Messages in this thread | | | Date | Wed, 25 Jul 2007 23:50:37 -0700 | From | Andrew Morton <> | Subject | Re: -mm merge plans for 2.6.23 |
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On Wed, 25 Jul 2007 23:33:24 -0700 "Ray Lee" <ray-lk@madrabbit.org> 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)/
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