blame: large-scale performance rewrite

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The previous implementation used a single sorted linear list of blame
entries for organizing all partial or completed work.  Every subtask had
to scan the whole list, with most entries not being relevant to the
task.  The resulting run-time was quadratic to the number of separate
chunks.

This change gives every subtask its own data to work with.  Subtasks are
organized into "struct origin" chains hanging off particular commits.
Commits are organized into a priority queue, processing them in commit
date order in order to keep most of the work affecting a particular blob
collated even in the presence of an extensive merge history.

For large files with a diversified history, a speedup by a factor of 3
or more is not unusual.

Signed-off-by: David Kastrup <dak@gnu.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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This commit is contained in:

David Kastrup

2014-04-26 01:56:49 +02:00

committed by Junio C Hamano

parent 35936f8fc3

commit 7e6ac6e439

1 changed files with 568 additions and 299 deletions

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builtin/blame.c

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