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    SubjectRe: [patch 00/41] cpu alloc / cpu ops v3: Optimize per cpu access
    On Thu, 29 May 2008, Andrew Morton wrote:

    > ext3 maintains three percpu_counters per mount. Each percpu_counter
    > does one percpu_alloc. People can mount an arbitrary number of ext3
    > filesystems!

    But its 4 bytes per alloc right?

    > Another: there are two percpu_counters (and hence two percpu_alloc()s)
    > per backing_dev_info. One backing_dev_info per disk and people have
    > been known to have thousands (iirc ~10,000) disks online.

    8 bytes per backing device. 80000 bytes for 10000 disks.

    > And those examples were plucked only from today's kernel. Who knows
    > what other problems will be in 2.6.45?

    We can always increase the sizes.

     \ /
      Last update: 2008-05-30 08:25    [W:0.020 / U:60.476 seconds]
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