From: Junio C Hamano <gitster@pobox.com>
Date: Tue, 6 Sep 2022 01:33:39 +0000 (-0700)
Subject: Merge branch 'ac/bitmap-lookup-table'
X-Git-Tag: v2.38.0-rc0~36
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3fe0121479ea340936d11927efa5a45a4e1e39cc;p=thirdparty%2Fgit.git

Merge branch 'ac/bitmap-lookup-table'

The pack bitmap file gained a bitmap-lookup table to speed up
locating the necessary bitmap for a given commit.

* ac/bitmap-lookup-table:
  pack-bitmap-write: drop unused pack_idx_entry parameters
  bitmap-lookup-table: add performance tests for lookup table
  pack-bitmap: prepare to read lookup table extension
  pack-bitmap-write: learn pack.writeBitmapLookupTable and add tests
  pack-bitmap-write.c: write lookup table extension
  bitmap: move `get commit positions` code to `bitmap_writer_finish`
  Documentation/technical: describe bitmap lookup table extension
---

3fe0121479ea340936d11927efa5a45a4e1e39cc
diff --cc Documentation/config/pack.txt
index 3e581eab84,b955ca572e..53093d9996
--- a/Documentation/config/pack.txt
+++ b/Documentation/config/pack.txt
@@@ -164,9 -164,16 +164,16 @@@ When writing a multi-pack reachability 
  computed; instead, any namehashes stored in an existing bitmap are
  permuted into their appropriate location when writing a new bitmap.
  
+ pack.writeBitmapLookupTable::
+ 	When true, Git will include a "lookup table" section in the
+ 	bitmap index (if one is written). This table is used to defer
+ 	loading individual bitmaps as late as possible. This can be
+ 	beneficial in repositories that have relatively large bitmap
+ 	indexes. Defaults to false.
+ 
  pack.writeReverseIndex::
  	When true, git will write a corresponding .rev file (see:
 -	link:../technical/pack-format.html[Documentation/technical/pack-format.txt])
 +	linkgit:gitformat-pack[5])
  	for each new packfile that it writes in all places except for
  	linkgit:git-fast-import[1] and in the bulk checkin mechanism.
  	Defaults to false.