D477: revlog: add option to mmap revlog index

[simonfar (Simon Farnsworth)]

simonfar added inline comments.

INLINE COMMENTS

> test-revlog-mmapindex.t:12-13
> +
> +mmap index which is now more than 4k long
> +  $ hg log -l 5 -T '{rev}\n' --config experimental.mmapindexthreshold=4k
> +  100

Two things:

1. Can you add a `ui.debug()` or similar so that you can show that `mmap()` is in use here?
2. Can you repeat the test without `mmap()` to show that `mmap()` and not-`mmap()` both still work?

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D477

To: mbthomas, #fbhgext, indygreg, #hg-reviewers, durin42
Cc: quark, durin42, simonfar, mercurial-devel