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    SubjectRe: [PATCH 15/18] fs: introduce a per-cpu last_ino allocator
    On Fri, Oct 08, 2010 at 04:21:29PM +1100, Dave Chinner wrote:
    > From: Eric Dumazet <>
    > new_inode() dirties a contended cache line to get increasing
    > inode numbers. This limits performance on workloads that cause
    > significant parallel inode allocation.
    > Solve this problem by using a per_cpu variable fed by the shared
    > last_ino in batches of 1024 allocations. This reduces contention on
    > the shared last_ino, and give same spreading ino numbers than before
    > (i.e. same wraparound after 2^32 allocations).

    FWIW, that one is begging to be split; what I mean is that there are
    two classes of callers; ones that will set i_ino themselves anyway
    and ones that really want i_ino invented. Two functions?

     \ /
      Last update: 2010-10-08 11:59    [W:0.019 / U:17.476 seconds]
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