linux-kernel - Re: git bisect in 2.6.25-rc1 looks weird

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Date:	Fri, 07 Mar 2008 15:50:17 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: git bisect in 2.6.25-rc1 looks weird

On Fri, 2008-03-07 at 08:34 +0100, Ingo Molnar wrote:
> * Zhang, Yanmin <yanmin_zhang@...ux.intel.com> wrote:
> 
> > Are the patches committed in line? or there are many paths crossing?
> 
> it's fine. git-bisect works on a tree of commits (not a queue/line of 
> commits) - so certain 'lines' of patches can jump in and out.
> 
> the scheduler patches are always in a straight line, so later on in the 
> bisection the jumping should be simplified.
Thanks.

> 
> you might want to look at "gitk" output and pick out a specific line of 
> scheduler patches. For example:
> 
>   commit 32a76006683f7b28ae3cc491da37716e002f198e
> 
> to:
> 
>   commit 6d082592b62689fb91578d0338d04a9f50991990
> 
> is a straight line of 95 scheduler related commits. That's one of the 
> probable areas where the regression you are looking for came in. 
> 
> when you bisect that specific range, you should try to undo the 
> following two commits:
It looks like many patches commited ater the 2 patches changed same
code lines or nearby code lines. So there are many conflictions when I undo
the 2 patches.

Let me retry.

> 
>       commit 58e2d4ca581167c2a079f4ee02be2f0bc52e8729
>       Author: Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
>       Date:   Fri Jan 25 21:08:00 2008 +0100
>       sched: group scheduling, change how cpu load is calculated
> 
>       commit 6b2d7700266b9402e12824e11e0099ae6a4a6a79
>       Author: Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
>       Date:   Fri Jan 25 21:08:00 2008 +0100
>       sched: group scheduler, fix fairness of cpu bandwidth allocation for task
> 
> 	Ingo

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