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authorLibravatar Derrick Stolee <dstolee@microsoft.com>2018-05-01 12:47:15 +0000
committerLibravatar Junio C Hamano <gitster@pobox.com>2018-05-22 12:36:34 +0900
commit819807b33f820dc17d96f043747daf18c5e38516 (patch)
treea631978767968ce79e76f5937e998f1d8a18d03e /Documentation/gitdiffcore.txt
parentcommit-graph: always load commit-graph information (diff)
downloadtgif-819807b33f820dc17d96f043747daf18c5e38516.tar.xz
ref-filter: use generation number for --contains
A commit A can reach a commit B only if the generation number of A is strictly larger than the generation number of B. This condition allows significantly short-circuiting commit-graph walks. Use generation number for '--contains' type queries. On a copy of the Linux repository where HEAD is contained in v4.13 but no earlier tag, the command 'git tag --contains HEAD' had the following peformance improvement: Before: 0.81s After: 0.04s Rel %: -95% Helped-by: Jeff King <peff@peff.net> Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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