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    SubjectRe: [PATCH 17/18] writeback: fix dirtied pages accounting on redirty
    On Sun, 2011-09-04 at 09:53 +0800, Wu Fengguang wrote:
    > De-account the accumulative dirty counters on page redirty.
    > Page redirties (very common in ext4) will introduce mismatch between
    > counters (a) and (b)
    > a) NR_DIRTIED, BDI_DIRTIED, tsk->nr_dirtied
    > This will introduce systematic errors in balanced_rate and result in
    > dirty page position errors (ie. the dirty pages are no longer balanced
    > around the global/bdi setpoints).

    So wtf is ext4 doing? Shouldn't a page stay dirty until its written out?

    That is, should we really frob around this behaviour or fix ext4 because
    its on crack?

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      Last update: 2011-09-06 18:21    [W:0.021 / U:131.836 seconds]
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