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

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Message-ID: <10876.1182698167@lwn.net>
Date:	Sun, 24 Jun 2007 09:16:07 -0600
From:	corbet@....net (Jonathan Corbet)
To:	Ingo Molnar <mingo@...e.hu>
Cc:	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,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC PATCH 0/6] Convert all tasklets to workqueues 

Ingo Molnar <mingo@...e.hu> wrote:

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

The cafe_ccic (OLPC) camera driver uses a tasklet to move frames out of
the DMA buffers in the streaming I/O path.  With this change in place,
I'd worry that the possibility of dropping frames would increase,
especially considering that (1) this is running on OLPC hardware, and 
(2) there is typically a streaming video application running in user
space. 

Obviously some testing is called for here.  I will make an attempt to do
that testing, but the next few weeks involve some insane travel which
will make that hard.  Stay tuned.

Thanks,

jon

Jonathan Corbet / LWN.net / corbet@....net
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