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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\.orig$

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\.rej$

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~$

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\.so$

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\.pyc$

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\.swp$

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\.prof$

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^tests/.*\.err$

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^build/

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^dist/

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^doc/.*\.[0-9](\.(x|ht)ml)?$

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^MANIFEST$

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^\.pc/

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^patches/

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^mercurial/__version__.py$