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    SubjectRe: [PATCH v6 00/11] locking/rwsem: Rework rwsem-xadd & enable new rwsem features
    On Wed, Oct 11, 2017 at 02:01:51PM -0400, Waiman Long wrote:
    > # of Patches Reader Writer
    > Applied Locking Rate Locking Rate
    > ------------ ------------ ------------
    > 0 5,155/ 5,155/ 5,155 5,154/248,852/346,281
    > 7 5,696/ 5,697/ 5,698 113,500/215,826/320,872
    > 8 4,827/ 5,047/ 5,215 4,826/176,797/284,069
    > 9 211,276/ 509,712/1,134,007 4,894/221,839/246,818
    > 11 884,513/1,043,989/1,252,533 9,604/ 11,105/ 25,225
    >
    > It can be seen that rwsem changes from writer-preferring to
    > reader-preferring.

    A bit radically so, you almost starve the writers there.

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