Re: What's cooking in git.git (Nov 2019, #02; Fri, 8)

[Matheus Tavares Bernardino <matheus.bernardino@usp.br>]

On Fri, Nov 8, 2019 at 12:00 PM Matheus Tavares Bernardino
<matheus.bernardino@usp.br> wrote:
>
> Hi, Junio
>
> On Fri, Nov 8, 2019 at 5:41 AM Junio C Hamano <gitster@pobox.com> wrote:
> [...]
> >
> > * mt/threaded-grep-in-object-store (2019-10-02) 11 commits
> >  - grep: move driver pre-load out of critical section
> >  - grep: re-enable threads in non-worktree case
> >  - grep: protect packed_git [re-]initialization
> >  - grep: allow submodule functions to run in parallel
> >  - submodule-config: add skip_if_read option to repo_read_gitmodules()
> >  - grep: replace grep_read_mutex by internal obj read lock
> >  - object-store: allow threaded access to object reading
> >  - replace-object: make replace operations thread-safe
> >  - grep: fix racy calls in grep_objects()
> >  - grep: fix race conditions at grep_submodule()
> >  - grep: fix race conditions on userdiff calls
> >
> >  Traditionally, we avoided threaded grep while searching in objects
> >  (as opposed to files in the working tree) as accesses to the object
> >  layer is not thread-safe.  This limitation is getting lifted.
> >
> >  What's the current status of this one?
>
> This was the last round of improvements I had in mind for this topic.
> So for my part, I think this is ready.

In fact, Jonathan Tan recently pointed out an issue[1] in this topic,
regarding the possibility of a race condition with the reading
windows. So I'll work on a new version.

[1]: https://public-inbox.org/git/20191112025418.254880-1-jonathantanmy@google.com/