Messages in this thread | | | Date | Wed, 14 Feb 2007 13:09:56 +0300 | From | Evgeniy Polyakov <> | Subject | Re: [patch 05/11] syslets: core code |
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On Wed, Feb 14, 2007 at 10:46:29AM +0100, Ingo Molnar (mingo@elte.hu) wrote: > > * Evgeniy Polyakov <johnpol@2ka.mipt.ru> wrote: > > > This will end up badly - I used the same approach in the early kevent > > days and was proven to have swapable memory for the ring. I think it > > would be much better to have userspace allocated ring and use > > copy_to_user() there. > > it is a userspace allocated ring - but pinned down by the kernel.
That's a problem - 1000/512 pages per 'usual' thread ends up with the whole memory locked by malicious/stupid application (at least on Debian and Mandrake there is no locked memory limit by default). And if such a limit exists, this will hurt big-iron applications, which want to used high-order rings legitimely.
> Ingo
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