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

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Date:	Fri, 22 Jun 2007 15:12:50 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	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>, kuznet@....inr.ac.ru
Subject: Re: [RFC PATCH 0/6] Convert all tasklets to workqueues


* Steven Rostedt <rostedt@...dmis.org> wrote:

> > that's where it belongs - but it first needs the cleanups suggested 
> > by Christoph.
> 
> I had the impression that he didn't want it in, but instead wanted 
> each driver to be changed separately.

that can be done too in a later stage. We cannot deprecate an API from 
one day to another. But wrapping it sanely via an existing framework 
makes complete sense.

> > > and perhaps even turn on the tasklets-as-workqueues as default.
> > 
> > that is a hack that shouldnt be in the patch. People can 
> > unapply/apply a patch just as well as they can flip a .config 
> > switch.
> 
> So should the patch be then to not even have the tasklet_softirq there 
> at all?  Have the patch simply replace the tasklets with workqueues, 
> and if someone doesn't like that, then they can simply remove the 
> patch?

yes, the softirq based tasklet implementation with workqueue based 
implementation, but the tasklet API itself should still stay.

ok, enough idle talking, lets see the next round of patches? :)

please remove all the pr_debug() lines as well - they are handy for 
development but are quite unnecessary for something headed 
upstream-wards. And please replace all the BUG_ON()s with WARN_ON_ONCE() 
...

	Ingo
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