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

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Message-ID: <20070622112335.GC23139@elte.hu>
Date:	Fri, 22 Jun 2007 13:23:35 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.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>, matthew.wilcox@...com,
	kuznet@....inr.ac.ru
Subject: Re: [RFC PATCH 0/6] Convert all tasklets to workqueues


* Christoph Hellwig <hch@...radead.org> wrote:

> > which actual in-kernel tasklets do you have in mind? I'm not aware 
> > of any in performance critical code. (now that both the RCU and the 
> > sched tasklet has been fixed.)
> 
> the one in megaraid_sas for example is in a performance-critical path 
> and was put in quite recently.

ah, i thought core kernel. I took a look, and i doubt that doing the 
megaraid SAS thing over a kernel thread would show up on the radar. If 
it does then it should probably be done in its separate per-CPU 
workqueue anyway, not in a globally scheduled thing like a tasklet. 
Tasklets just dont scale.

	Ingo
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