Messages in this thread | | | From | Rusty Russell <> | Subject | Re: [PATCH 5/5] tun: vringfd xmit support. | Date | Sun, 20 Apr 2008 00:41:43 +1000 |
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On Saturday 19 April 2008 05:06:34 Andrew Morton wrote: > On Sat, 19 Apr 2008 01:15:15 +1000 Rusty Russell <rusty@rustcorp.com.au> wrote: > > > What is the maximum numbet of pages which an unpriviliged user can > > > concurrently pin with this code? > > > > Since only root can open the tun device, it's currently OK. The old code > > kmalloced and copied: is there some mm-fu reason why pinning userspace > > memory is worse? > > We generally try to avoid it - it allows users to dos the box.
My question is: is pinning a page worse than allocating a (kernel) page in some way?
Cheers, Rusty.
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