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    SubjectRe: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig
    On Tue, 8 Aug 2006 04:17:59 +0200
    Andi Kleen <ak@suse.de> wrote:

    >
    > >
    > > And it's a pretty nasty one because it can get people into the situation
    > > where the kernel worked fine for those who released it, but users who
    > > happen to load more modules (or the right combination of them) will
    > > experience per-cpu memory exhaustion.
    >
    > Yes, and a high value will waste a lot of memory for normal users.
    >
    > > So shouldn't we being scaling the per-cpu memory as well?
    >
    > If we move it into vmalloc space it would be easy to extend at runtime - just the
    > virtual address space would need to be prereserved, but then more pages
    > could be mapped. Maybe we should just do that instead of continuing to kludge around?

    Sounds sane.

    otoh, we need something for 2.6.19.

    > Drawback would be some more TLB misses.

    yup. On some (important) architectures - I'm not sure which architectures
    do the bigpage-for-kernel trick.
    -
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