Messages in this thread | | | Date | Thu, 15 Dec 2005 21:02:39 -0800 | From | Sridhar Samudrala <> | Subject | Re: [RFC][PATCH 0/6] Critical Page Pool |
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Matthew Dobson wrote:
>Pavel Machek wrote: > > >>>>And as you noticed, it does not work for your original usage case, >>>>because reserved memory pool would have to be "sum of all network >>>>interface bandwidths * ammount of time expected to survive without >>>>network" which is way too much. >>>> >>>> >>>Well, I never suggested it didn't work for my original usage case. The >>>discussion we had is that it would be incredibly difficult to 100% >>>iron-clad guarantee that the pool would NEVER run out of pages. But we can >>>size the pool, especially given a decent workload approximation, so as to >>>make failure far less likely. >>> >>> >>Perhaps you should add file in Documentation/ explaining it is not >>reliable? >> >> > >That's a good suggestion. I will rework the patch's additions to >Documentation/sysctl/vm.txt to be more clear about exactly what we're >providing. > > > > >>>>If you want few emergency pages for some strange hack you are doing >>>>(swapping over network?), just put swap into ramdisk and swapon() it >>>>when you are in emergency, or use memory hotplug and plug few more >>>>gigabytes into your machine. But don't go introducing infrastructure >>>>that _can't_ be used right. >>>> >>>> >>>Well, that's basically the point of posting these patches as an RFC. I'm >>>not quite so delusional as to think they're going to get picked up right >>>now. I was, however, hoping for feedback to figure out how to design >>>infrastructure that *can* be used right, as well as trying to find other >>>potential users of such a feature. >>> >>> >>Well, we don't usually take infrastructure that has no in-kernel >>users, and example user would indeed be nice. >> Pavel >> >> > >Understood. I certainly wouldn't expect otherwise. I'll see if I can get >Sridhar to post his networking changes that take advantage of this. > > I have posted these patches yesterday on lkml and netdev and here is a link to the thread. http://thread.gmane.org/gmane.linux.kernel/357835
Thanks Sridhar
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