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ieot: default to not writing IEOT section

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As with EOIE, popular versions of Git do not support the new IEOT
extension yet.  When accessing a Git repository written by a more
modern version of Git, they correctly ignore the unrecognized section,
but in the process they loudly warn

	ignoring IEOT extension

resulting in confusion for users.  Introduce the index extension more
gently by not writing it yet in this first version with support for
it.  Soon, once sufficiently many users are running a modern version
of Git, we can flip the default so users benefit from this index
extension by default.

Introduce a '[index] recordOffsetTable' configuration variable to
control whether the new index extension is written.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Nieder 2018-11-19 22:12:22 -08:00 committed by Junio C Hamano
parent d8465500c3
commit 429160544d
2 changed files with 17 additions and 1 deletions
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7
Documentation/config/index.txt
View file

@ -5,6 +5,13 @@ index.recordEndOfIndexEntries::
reading the index using Git versions before 2.20. Defaults to
'false'.
index.recordOffsetTable::
Specifies whether the index file should include an "Index Entry
Offset Table" section. This reduces index load time on
multiprocessor machines but produces a message "ignoring IEOT
extension" when reading the index using Git versions before 2.20.
Defaults to 'false'.
index.threads::
Specifies the number of threads to spawn when loading the index.
This is meant to reduce index load time on multiprocessor machines.

11
read-cache.c
View file

@ -2698,6 +2698,15 @@ static int record_eoie(void)
return 0;
}
static int record_ieot(void)
{
int val;
if (!git_config_get_bool("index.recordoffsettable", &val))
return val;
return 0;
}
/*
* On success, `tempfile` is closed. If it is the temporary file
* of a `struct lock_file`, we will therefore effectively perform
@ -2761,7 +2770,7 @@ static int do_write_index(struct index_state *istate, struct tempfile *tempfile,
else
nr_threads = 1;
if (nr_threads != 1) {
if (nr_threads != 1 && record_ieot()) {
int ieot_blocks, cpus;
/*