revlog: use an explicit config option to enable mmap usage for index
We replace the `experimental.mmapindexthreshold` with two options:
The `storage.revlog.mmap.index` is a boolean option to enable or disable the
feature. The `storage.revlog.mmap.index:size-threshold` is a bytes option that
control when we will be using mmap instead of plain reading.
#require no-windows
$ . "$TESTDIR/remotefilelog-library.sh"
$ hg init master
$ cd master
$ cat >> .hg/hgrc <<EOF
> [remotefilelog]
> server=True
> EOF
$ echo x > x
$ hg commit -qAm x
$ echo y >> x
$ hg commit -qAm y
$ echo z >> x
$ hg commit -qAm z
$ echo a > a
$ hg commit -qAm a
$ cd ..
$ hgcloneshallow ssh://user@dummy/master shallow -q
2 files fetched over 1 fetches - (2 misses, 0.00% hit ratio) over *s (glob)
$ cd shallow
Test blame
$ hg blame x
0: x
1: y
2: z
2 files fetched over 1 fetches - (2 misses, 0.00% hit ratio) over *s (glob)
Test grepping the working directory.
$ hg grep --all-files x
x:x
$ echo foo >> x
$ hg grep --all-files x
x:x