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    SubjectRe: Improve lseek scalability v3
    On Thu, Sep 15, 2011 at 04:06:46PM -0700, Andi Kleen wrote:
    > Currently generic_file_llseek users synchronize all on the inode i_mutex,
    > which is very heavy handed because it affects even different processes.
    >
    > This patchkit attempts to make generic_file_llseek (mostly) lockless.

    Yes, but, are there any real workloads which care? I know will-it-scale
    says that lseek doesn't scale, but any real app which has a seek-heavy
    workload is surely using pread()/pwrite() by now ... after all, they
    were in UNIX98 so they've been a standard for 13 years.

    --
    Matthew Wilcox Intel Open Source Technology Centre
    "Bill, look, we understand that you're interested in selling us this
    operating system, but compare it to ours. We can't possibly take such
    a retrograde step."


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