linux-kernel - Re: [GIT PULL] perf fix

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Message-ID: <20120523202010.GA29094@gmail.com>
Date:	Wed, 23 May 2012 22:20:10 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Josh Boyer <jwboyer@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] perf fix

* Josh Boyer <jwboyer@...il.com> wrote:

> > This pull request you replied to is the v3.4 era fixes tree, 
> > with one remaining fix in it.
> 
> I see.  The forest of tip trees apparently confuses me still.  
> I'll figure it out eventually.

The topic tree layout for single-topic trees is pretty simple 
and straightforward - but the situation you met here was 
arguably a weird corner case:

 X/urgent are the fixes that go to Linus
 X/core   are the development patches for the next merge window

Where 'X' can be one of: perf, sched, timer, irq - the main 
subsystem trees we maintain. (x86 is a multi-topic tree, with 
intuitively named topic trees, such as x86/reboot, x86/asm or 
x86/mm.)

All of them are test-merged into tip:master - this is the one 
that you will typically use, the topic layout is for maintainers 
and for power-contributors/submaintaners who are sending Git 
pull requests to us.

at the beginning of a merge window (i.e. right now) there might 
be fixes pending in perf/urgent that did not make it to v3.4. 
Instead of merging them into perf/core I tend to send them to 
Linus as a standalone tree.

The rest of perf/core, once the initial one or two sets of 
commits get pulled by Linus, morphs into perf/urgent, fairly 
early in the merge window.

Thus there's a new perf/urgent and an empty perf/core, and the 
cycle starts again.

You met this cycle switch period to the day (the chance is only 
1:90 for that, consider yourself lucky ;-), which created the 
impression of a confusing fixes workflow.

Thanks,

	Ingo
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