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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
