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authorLibravatar Brian Downing <bdowning@lavos.net>2008-08-14 00:36:51 -0500
committerLibravatar Junio C Hamano <gitster@pobox.com>2008-08-13 23:10:23 -0700
commitb463776086a12c587f6d91c0347641fb6f7ddd72 (patch)
treeba25e4234a81ed9d972accfe92276a407c46225b /Documentation
parentMake xdi_diff_outf interface for running xdiff_outf diffs (diff)
downloadtgif-b463776086a12c587f6d91c0347641fb6f7ddd72.tar.xz
Use strbuf for struct xdiff_emit_state's remainder
Continually xreallocing and freeing the remainder member of struct xdiff_emit_state was a noticeable performance hit. Use a strbuf instead. This yields a decent performance improvement on "git blame" on certain repositories. For example, before this commit: $ time git blame -M -C -C -p --incremental server.c >/dev/null 101.52user 0.17system 1:41.73elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (0major+39561minor)pagefaults 0swaps With this commit: $ time git blame -M -C -C -p --incremental server.c >/dev/null 80.38user 0.30system 1:20.81elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (0major+50979minor)pagefaults 0swaps Signed-off-by: Brian Downing <bdowning@lavos.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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