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    SubjectRe: [RFC][PATCH 6/8] mm: handle_speculative_fault()
    On 01/07/2010 12:36 PM, Linus Torvalds wrote:
    > On Thu, 7 Jan 2010, Peter Zijlstra wrote:
    >> Right, supposing we can make this speculative fault stuff work, then we
    >> can basically reduce the mmap_sem usage in fault to:
    >> - allocating new page tables
    >> - extending the growable vmas
    >> And do everything else without holding it, including zeroing and IO.
    > Well, I have yet to hear a realistic scenario of _how_ to do it all
    > speculatively in the first place, at least not without horribly subtle
    > complexity issues. So I'd really rather see how far we can possibly get by
    > just improving mmap_sem.

    I would like to second this sentiment. I am trying to make the
    anon_vma and rmap bits more scalable for multi-process server
    workloads and it is quite worrying how complex locking already

    All rights reversed.

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      Last update: 2010-01-08 00:55    [W:0.020 / U:1.716 seconds]
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