Just thinking out loud. If I'm not mistaken, a directory's mtime is
only changed when files are added are removed in that directory. And
that's all we care about in read_directory. So if we keep a secondary
index containing the list of all (tracked and untracked) .gitignore
files and all untracked
Result of today. I cherry-picked nd/read-directory-recursive-optim to
see how far I can get after pulling all the tricks. This is a slower
machine so time is longer. Anyway, read_directory time is reduced
about 70% in the end.
function before after
--
t
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