From: Johannes Sixt <j.sixt@eudaptics.com>
To: Erez Zadok <ezk@cs.sunysb.edu>
Cc: Git Mailing List <git@vger.kernel.org>
Subject: Re: very slow cherry-pick'ing (old-2.6-bkcvs tree)
Date: Fri, 07 Sep 2007 09:27:21 +0200 [thread overview]
Message-ID: <46E0FD59.2060406@eudaptics.com> (raw)
In-Reply-To: <200709062351.l86NpnAK004807@agora.fsl.cs.sunysb.edu>
Erez Zadok schrieb:
> Our group maintains Unionfs on the latest -rc kernel, but we also maintain
> several backports going all the way to 2.6.9. Once we complete the
> development and testing of a feature/fix in -latest, we cherry-pick those
> commits to older backports, and test those. When I cherry-pick from -latest
> to my 2.6.{22,21,20,19,18} repositories, it works reasonably fast. But when
> I cherry-pick to my 2.6.9 tree, it runs about 20 times slower! Why? Is
> there anything I can do to inspect what's going on and perhaps speed up the
> cherry-picking process?
>
> Some info:
>
> My 2.6.{18,19,20,21,22} trees were cloned from
>
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-2.6.<N>.y.git
>
> My 2.6.9 tree, however, was cloned from
>
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/old-2.6-bkcvs.git
>
> after which, I truncated the tree (git-reset) to Linus commit which read
> "Linux 2.6.9-final".
I *think* that the reason for this is that those repositories don't have any
commits in common (but I don't have clones to verify my claim). Since
cherry-pick does merge-recursive, it tries to find a suitable merge base,
but since there is no history in common, it walks both histories all the way
down only to find that there is no possible merge base.
You could improve the situation if you graft the histories together:
echo $first_commit_in_2.6.12 $suitable_commit_in_bkcvs > .git/info/grafts
-- Hannes
prev parent reply other threads:[~2007-09-07 7:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-06 23:51 very slow cherry-pick'ing (old-2.6-bkcvs tree) Erez Zadok
2007-09-07 4:42 ` Shawn O. Pearce
2007-09-07 7:27 ` Johannes Sixt [this message]
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