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 clone . ../b

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a

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+ hg verify

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checking changesets

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checking manifests

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crosschecking files in changesets and manifests

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checking files

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1 files, 1 changesets, 1 total revisions

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+ hg clone -U . ../c

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cat: a: No such file or directory

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+ hg verify

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checking changesets

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checking manifests

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crosschecking files in changesets and manifests

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checking files

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1 files, 1 changesets, 1 total revisions

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+ hg clone ../a

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+ hg cat a

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a