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

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Message-ID: <10203.1182816012@lwn.net>
Date:	Mon, 25 Jun 2007 18:00:12 -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 

A couple of days ago I said:

> The cafe_ccic (OLPC) camera driver uses a tasklet to move frames out of
> the DMA buffers in the streaming I/O path....
> 
> Obviously some testing is called for here.  I will make an attempt to do
> that testing

I've done that testing - I have an OLPC B3 unit running V2 of the
tasklet->workqueue patch, and all seems well.  30 FPS to the display and
no dropped frames.  The tasklets/0 process is running 3-5% CPU, in case
that's interesting.  For whatever reason, I see about 3% *more* idle
time when running just mplayer than I did without the patch.

Consider my minor qualms withdrawn, there doesn't seem to be any trouble
in this area.

Thanks,

jon

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