linux-kernel - Re: [RFC PATCH 0/6] Convert all tasklets to workqueues

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Date:	Fri, 22 Jun 2007 16:28:06 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	david@...g.hm, Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Hellwig <hch@...radead.org>,
	john stultz <johnstul@...ibm.com>,
	Oleg Nesterov <oleg@...sign.ru>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>, matthew.wilcox@...com,
	kuznet@....inr.ac.ru
Subject: Re: [RFC PATCH 0/6] Convert all tasklets to workqueues

On Sat, 2007-06-23 at 00:44 +0200, Ingo Molnar wrote:
> * Daniel Walker <dwalker@...sta.com> wrote:
> 
> > > remember, these changes have been in use in -rt for a while. there's 
> > > reason to believe that they aren't going to cause drastic problems.
> > 
> > Since I've been working with -rt (~2 years now I think) it's clear 
> > that the number of testers of the patch isn't all that high compared 
> > to the stable kernel . [...]
> 
> You havent been watching it too closely i guess :-) The -rt kernel often 
> pops up regressions before mainline does, especially when it comes to 
> arcane hardware often used by embedded vendors [ =B-) ]. It even 
> triggers certain high-end scalability and race bugs before the mainline 
> kernel does, due to its unique scheduling behavior.

Don't assume anything Ingo ;)

> So yes, -rt obviously does not have as wide of a tester basis as the 
> mainline kernel (but it's by no means small), it nevertheless has a 
> tester base that is partly orthogonal to the mainline kernel.
> 
> Furthermore, -rt has a wide enough tester base for it to know that if 
> something has not caused problems in it for years is certainly at least 
> a good indicator that something isnt going to cause drastic problems ... 
> which was the point to begin with.

As I said, it's a plus but not a silver bullet ? Are you saying I was
wrong ?

Daniel

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