Re: [PATCH 00/25] mm: Preemptibility -v7

[Andi Kleen]

Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> 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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