Messages in this thread | | | From | "H. Peter Anvin" <> | Subject | Re: [RFC] Arch option to touch newly allocated pages | Date | 4 Mar 2002 09:46:55 -0800 |
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Followup to: <200203040504.AAA05343@ccure.karaya.com> By author: Jeff Dike <jdike@karaya.com> In newsgroup: linux.dev.kernel > > 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.
-hpa -- <hpa@transmeta.com> at work, <hpa@zytor.com> in private! "Unix gives you enough rope to shoot yourself in the foot." http://www.zytor.com/~hpa/puzzle.txt <amsp@zytor.com> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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