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From: Jeff King <peff@peff.net>
To: Derrick Stolee <stolee@gmail.com>
Cc: Constantine <hi-angel@yandex.ru>, Junio C Hamano <gitster@pobox.com>, Christian Couder <christian.couder@gmail.com>, Mike Hommey <mh@glandium.org>, git <git@vger.kernel.org>
Subject: Re: git-clone causes out of memory
Date: Fri, 13 Oct 2017 09:50:58 -0400
Message-ID: <20171013135058.q7vhufdtin42ddic@sigill.intra.peff.net> (raw)
In-Reply-To: <a4ebf552-35d4-d55f-6f08-731afa2cd2de@gmail.com>

On Fri, Oct 13, 2017 at 09:39:14AM -0400, Derrick Stolee wrote:

> Since I don't understand enough about the consumers to diff_tree_oid() (and
> the fact that the recursive behavior may be wanted in some cases), I think
> we can fix this in builtin/rev-list.c with this simple diff:
> 
> ---
> 
> diff --git a/builtin/rev-list.c b/builtin/rev-list.c
> index ded1577424..b2e8e02cc8 100644
> --- a/builtin/rev-list.c
> +++ b/builtin/rev-list.c
> @@ -285,6 +285,9 @@ int cmd_rev_list(int argc, const char **argv, const char
> *prefix)
> 
>         git_config(git_default_config, NULL);
>         init_revisions(&revs, prefix);
> +
> +       revs.pruning.flags = revs.pruning.flags & ~DIFF_OPT_RECURSIVE;
> +

Hmm, this feels wrong, because we _do_ want to recurse down and follow
the pathspec to see if there are real changes.

We should be comparing an empty tree and d0/d0/d0/d0 (or however deep
your pathspec goes). We should be able to see immediately that the entry
is not present between the two and not bother descending. After all,
we've set the QUICK flag in init_revisions(). So the real question is
why QUICK is not kicking in.

-Peff

  reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-13  9:51 Constantine
2017-10-13 10:06 ` Mike Hommey
2017-10-13 10:26   ` Christian Couder
2017-10-13 10:37     ` Mike Hommey
2017-10-13 10:44       ` Christian Couder
2017-10-13 12:04         ` Junio C Hamano
2017-10-13 12:12           ` Constantine
2017-10-13 12:44             ` Jeff King
2017-10-13 13:15               ` Derrick Stolee
2017-10-13 13:39                 ` Derrick Stolee
2017-10-13 13:50                   ` Jeff King [this message]
2017-10-13 13:55                     ` Derrick Stolee
2017-10-13 13:56                       ` Jeff King
2017-10-13 14:10                         ` Jeff King
2017-10-13 14:20                           ` Jeff King
2017-10-13 14:25                             ` Derrick Stolee
2017-10-13 14:26                               ` Jeff King
2017-10-13 14:30                                 ` Derrick Stolee
2017-10-13 15:27                                 ` [PATCH] revision: quit pruning diff more quickly when possible Jeff King
2017-10-13 15:37                                   ` Derrick Stolee
2017-10-13 15:44                                     ` Jeff King
2017-10-14  2:43                                   ` Junio C Hamano
2017-10-13 12:35   ` git-clone causes out of memory Jeff King

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