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    SubjectRe: [PATCH 00/25] mm: Preemptibility -v7
    Date
    Peter Zijlstra <a.p.zijlstra@chello.nl> writes:

    > This patch-set makes part of the mm a lot more preemptible. It converts
    > i_mmap_lock and anon_vma->lock to mutexes and makes mmu_gather fully
    > preemptible.
    >
    > The main motivation was making mm_take_all_locks() preemptible, since it
    > appears people are nesting hundreds of spinlocks there.

    Just curious: why is mm_take_all_locks() a problem? As far as I can see
    it's just used when starting KVM or GRU the first time. Is that a common
    situation?

    -Andi

    --
    Andi Kleen
    Intel Open Source Technology Center



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