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authorLibravatar Taylor Blau <me@ttaylorr.com>2021-01-25 18:37:18 -0500
committerLibravatar Junio C Hamano <gitster@pobox.com>2021-01-25 18:32:43 -0800
commit8ef50d9958f7be21e38026433d30f72521b4de47 (patch)
treeb653d9be420dde954169b0af92ebf331ff607deb /Documentation/RelNotes/1.7.7.4.txt
parentpackfile: prepare for the existence of '*.rev' files (diff)
downloadtgif-8ef50d9958f7be21e38026433d30f72521b4de47.tar.xz
pack-write.c: prepare to write 'pack-*.rev' files
This patch prepares for callers to be able to write reverse index files to disk. It adds the necessary machinery to write a format-compliant .rev file from within 'write_rev_file()', which is called from 'finish_tmp_packfile()'. Similar to the process by which the reverse index is computed in memory, these new paths also have to sort a list of objects by their offsets within a packfile. These new paths use a qsort() (as opposed to a radix sort), since our specialized radix sort requires a full revindex_entry struct per object, which is more memory than we need to allocate. The qsort is obviously slower, but the theoretical slowdown would require a repository with a large amount of objects, likely implying that the time spent in, say, pack-objects during a repack would dominate the overall runtime. Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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