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 a -u a -d 0 0

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+ hg init

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+ hg add b

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+ hg commit -m b -u b -d 0 0

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+ hg pull ../a

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pulling from ../a

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searching for changes

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warning: pulling from an unrelated repository!

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adding changesets

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adding manifests

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adding file changes

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added 1 changesets with 1 changes to 1 files

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(run 'hg update' to get a working copy)

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+ hg heads

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changeset:   1:9a79c33a9db3

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tag:         tip

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user:        a

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date:        Thu Jan  1 00:00:00 1970

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summary:     a

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changeset:   0:01f8062b2de5

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user:        b

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date:        Thu Jan  1 00:00:00 1970

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summary:     b

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