Message-ID: <20070626150323.anz74r8q8s408s4o@webmail.df.eu>
Date: Tue, 26 Jun 2007 15:03:23 +0200
From: Clemens Ladisch <clemens@ladisch.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: Takashi Iwai <tiwai@suse.de>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Steven Rostedt <rostedt@goodmis.org>,
       LKML <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Christoph Hellwig <hch@infradead.org>,
       john stultz <johnstul@us.ibm.com>, Oleg Nesterov <oleg@tv-sign.ru>,
       "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
       Dipankar Sarma <dipankar@in.ibm.com>,
       "David S. Miller" <davem@davemloft.net>, matthew.wilcox@hp.com,
       kuznet@ms2.inr.ac.ru
Subject: Re: [RFC PATCH 0/6] Convert all tasklets to workqueues
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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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