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

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Date:	Tue, 26 Jun 2007 15:03:23 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Takashi Iwai <tiwai@...e.de>,
	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

Ingo Molnar wrote:
> so how about the following, different approach: anyone who has a tasklet
> in any performance-sensitive codepath, please yell now.

ALSA uses quite a few tasklets in the framework and in several  
drivers.  Since we
care very much about low latency, many places use tasklet_hi_*.

It would be possible to convert to some GENERIC_SOFTIRQ mechanism, but  
then we'd
want to use a softirq that has higher priority than the 'standard' generic
softirq, similar to HI_SOFTIRQ vs. TASKLET_SOFTIRQ.

BTW: Is there a reason why HRTIMER_SOFTIRQ is the lowest-priority  
softirq instead
of being near TIMER_SOFTIRQ?


Regards,
Clemens

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