dirstate walking optimizations The repo walking code introduces a number of calls to dirstate.map.copy(), significantly slowing down the walk on large trees. When a list of files is passed to the walking code, we should only look at map entries relevant to the file list passed in. dirstate.filterfiles() is added to return a subset of the dirstate map. The subset includes in files passed in, and if one of the files requested is actually a directory, it includes any files inside that directory tree. This brings the time for hg diff Makefile down from 1.7s to .3s on a linux kernel repo. Also, the diff command was unconditionally calling makewalk, leading to an extra pass through repo.changes. This patch avoids the call to makewalk when commands.diff isn't given a list of patterns, cutting the time for hg diff (with no args) in half. Index: mine/mercurial/hg.py ===================================================================

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+ hg init

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+ hg add a

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+ hg commit -m test -d 0 0

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+ hg history

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changeset:   0:acb14030fe0a

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tag:         tip

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user:        test

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date:        Thu Jan  1 00:00:00 1970

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summary:     test

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+ hg tag -d 0 0 bleah

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+ hg history

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changeset:   1:863197ef0378

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tag:         tip

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user:        test

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date:        Thu Jan  1 00:00:00 1970

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summary:     Added tag bleah for changeset acb14030fe0a21b60322c440ad2d20cf7685a376

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changeset:   0:acb14030fe0a

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tag:         bleah

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user:        test

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date:        Thu Jan  1 00:00:00 1970

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summary:     test

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+ hg tag -d 0 0 bleah2

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abort: working copy of .hgtags is changed!

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(please commit .hgtags manually)

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failed