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    SubjectRe: [PATCH 00/25] mm: Preemptibility -v7
    On Tue, Jan 25, 2011 at 06:31:11PM +0100, Peter Zijlstra wrote:
    > 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.
    > The side-effects are that can finally make mmu_gather preemptible,
    > something which lots of people have wanted to do for a long time.
    > It also gets us anon_vma refcounting, which seems to result in a nice
    > cleanup of the anon_vma lifetime rules wrt KSM and compaction.
    > This patch-set is build and boot-tested on x86_64 (a previous version was
    > also tested on Dave's Niagra2 machines, and I suppose s390 was too when
    > Martin provided the conversion patch for his arch).
    > There are no known architectures left unconverted.

    Hi Peter.

    Foregive me my ignorance..
    Why is this relevant for sparc64 but not for sparc32?

    A quick grep showed up only this in sparc32 specific files:

    mm/init_32.c:DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

    Maybe this is just something sparc32 does not support?


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