linux-kernel - Re: 'git gc' always run, on old kernel repo?

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Message-ID: <47C715EB.3060303@garzik.org>
Date:	Thu, 28 Feb 2008 15:13:31 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	git@...r.kernel.org
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 'git gc' always run, on old kernel repo?

Jeff Garzik wrote:
>> [jgarzik@...tzel netdev-2.6]$ git-am --signoff --utf8 /g/tmp/mbox 
>> Applying Add support for HT1100 SATA controller - sent from evolution
>> Auto packing your repository for optimum performance. You may also
>> run "git gc" manually. See "git help gc" for more information.
>> Counting objects: 1, done.
>> Writing objects: 100% (1/1), done.
>> Total 1 (delta 0), reused 0 (delta 0)
>> warning: There are too many unreachable loose objects; run 'git prune' 
>> to remove them.
> 
> IMO there is a broken hueristic in there somewhere...  I regularly run 
> 'git gc' on my repos...


Follow-up...   this is already becoming a PITA.

I am going through and rebasing multiple repos in the same repository... 
and it keeps running 'git gc' on each branch!  grrrr.

Step 1:
pull "../linux-2.6" into master branch of local repo.  this repo was 
created with "--reference".  It _might_ be reasonable to expect 'git gc' 
to be run:

> [jgarzik@...tzel libata-dev]$ git pull ../linux-2.6/
> Updating bfa274e..7704a8b
> Fast forward
> Auto packing your repository for optimum performance. You may also
> run "git gc" manually. See "git help gc" for more information.
> Counting objects: 462, done.
> Compressing objects: 100% (333/333), done.
> Writing objects: 100% (462/462), done.
> Total 462 (delta 345), reused 176 (delta 129)
> warning: There are too many unreachable loose objects; run 'git prune' to remove them.


Step 2:
In the same repo, rebase a branch (contains a single changeset), 
immediately following step #1:

> [jgarzik@...tzel libata-dev]$ git branch
>   ALL
>   NEXT
> * master
>   mv-ahci-pata
>   new-eh
>   sii-lbt
> [jgarzik@...tzel libata-dev]$ git-checkout sii-lbt && git-rebase master
> Switched to branch "sii-lbt"
> First, rewinding head to replay your work on top of it...
> HEAD is now at 7704a8b... Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6
> Applying [libata] sata_sil: Turn on Large Block Transfer (LBT) feature
> Auto packing your repository for optimum performance. You may also
> run "git gc" manually. See "git help gc" for more information.
> Counting objects: 4, done.
> Compressing objects: 100% (4/4), done.
> Writing objects: 100% (4/4), done.
> Total 4 (delta 0), reused 0 (delta 0)
> warning: There are too many unreachable loose objects; run 'git prune' to remove them.


Step 3:
Ditto, a second rebase in the same repo, immediately following step #2:

> [jgarzik@...tzel libata-dev]$ git-checkout new-eh && git-rebase master
> Switched to branch "new-eh"
> First, rewinding head to replay your work on top of it...
> HEAD is now at 7704a8b... Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6
> Applying [libata #new-eh] sata_sx4: convert to new EH
> Auto packing your repository for optimum performance. You may also
> run "git gc" manually. See "git help gc" for more information.
> Counting objects: 4, done.
> Compressing objects: 100% (4/4), done.
> Writing objects: 100% (4/4), done.
> Total 4 (delta 0), reused 0 (delta 0)
> warning: There are too many unreachable loose objects; run 'git prune' to remove them.


Step 4:
Ditto, a third rebase in the same repo, immediately following step #3:

> [jgarzik@...tzel libata-dev]$ git-checkout mv-ahci-pata && git-rebase master
> Switched to branch "mv-ahci-pata"
> First, rewinding head to replay your work on top of it...
> HEAD is now at 7704a8b... Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6
> Applying [libata #mv-ahci-pata] ahci: add rough draft Marvell PATA support
> Auto packing your repository for optimum performance. You may also
> run "git gc" manually. See "git help gc" for more information.
> Counting objects: 5, done.
> Compressing objects: 100% (5/5), done.
> Writing objects: 100% (5/5), done.
> Total 5 (delta 0), reused 0 (delta 0)
> warning: There are too many unreachable loose objects; run 'git prune' to remove them.


Will the 'git gc' never end???

	Jeff



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