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authorLibravatar Jeff King <peff@peff.net>2021-06-22 12:04:50 -0400
committerLibravatar Junio C Hamano <gitster@pobox.com>2021-06-28 20:30:17 -0700
commitb2086b518366ed71caac498857b9c5765dd73ed1 (patch)
tree8e47d1a2368c3a1d758dacec201f9669928e4f37 /trace2/tr2_tbuf.h
parentpretty.h: update and expand docstring for userformat_find_requirements() (diff)
downloadtgif-b2086b518366ed71caac498857b9c5765dd73ed1.tar.xz
log: avoid loading decorations for userformats that don't need it
If no --decorate option is given, we default to auto-decoration. And when that kicks in, cmd_log_init_finish() will unconditionally load the decoration refs. However, if we are using a user-format that does not include "%d" or "%D", we won't show the decorations at all, so we don't need to load them. We can detect this case and auto-disable them by adding a new field to our userformat_want helper. We can do this even when the user explicitly asked for --decorate, because it can't affect the output at all. This patch consistently reduces the time to run "git log -1 --format=%H" on my git.git clone (with ~2k refs) from 34ms to 7ms. On a much more extreme real-world repository (with ~220k refs), it goes from 2.5s to 4ms. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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