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A comment on Filesystem devs should aim to make “badly written” app code “just work” (2009). Parent comment

Re:Filesystem devs should aim to make “badly written” app co... by blt on Sunday December 01, 2019 @02:41AM (#21674373)
I would go for a comment like "a simpler naive implementation is in commit A0348C. It ran approx. 2.5x slower in 2019."
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Re:Filesystem devs should aim to make “badly written” app co... by jlokier on Sunday December 01, 2019 @05:18PM (#21678186)
I would do similar but include the commit timestamp and/or words from the subject to help locate the code if the commit id can't be retrieved.

Rebasing and other means of moving patches (email etc, adding signed-off-by) can cause the original commit id to become invalid, and eventually unretrievable.

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