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SubjectRe: [RFC] Arch option to touch newly allocated pages
Followup to:  <>
By author: Jeff Dike <>
In newsgroup:
> Even with address overcommit management, I can fault if I touch pages when
> tmpfs is full but the system is not near overcommit.
> > Furthermore unless you are very careful you may
> > fault again on the stack push for the SIGBUS and if that faults -
> > SIGKILL->OOM time
> We are talking about UML kernel stacks. If they have been allocated the way
> I'm proposing with the UML __alloc_pages touching each page on the way out,
> they are allocated on the host, and therefore can't fault.
> This seems to me to be sufficiently careful.
> One of us is missing something, who is it?

I think it's you -- you seem to suffer from the "my application is the
only one that counts" syndrome. If you want to pages dirtied, then
dirty them using memset() or similar.

<> at work, <> in private!
"Unix gives you enough rope to shoot yourself in the foot." <>
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