[lkml]   [2011]   [Jan]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH 00/25] mm: Preemptibility -v7

    > Its nesting hundreds of spinlocks (255+) make the preempt debug code
    > unhappy, it also causes fun latencies when you do start KVM/GRU
    > Although arguably that's the least convincing reason to do all this its
    > the one that got me to actually compose this series -- I really should
    > write a new leader..
    Least Convincing is a good description...
    Tuning operations which only happen once is not very interesting,
    especially if that affects
    fast paths.

    > Making all this preemptible also allows making the whole mmu_gather
    > thing preemptible, which is something we've wanted to do for a long
    > while, it also allows XPMEM or whatever that thing was called (Andrea
    > knows) and of course, it moves a part of -rt upstream.

    I thought the reason for the preempt off inside the mmu gather region was
    to stay on the same CPU for local/remote flushes. How would it change that?

    > If we decide to keep patch 24, it also simplifies the truncate path
    > quite a bit.
    That sounds like a good thing. Making truncate simpler is always good.


     \ /
      Last update: 2011-01-25 21:49    [W:0.022 / U:5.652 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site