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 commit #0 -d 0 0

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+ hg add b

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+ hg commit -m commit #1 -d 0 0

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+ hg update 0

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+ hg add c

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+ hg commit -m commit #2 -d 0 0

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+ hg update -m 1

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+ hg commit -m commit #3 -d 0 0