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

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Date:	Fri, 29 Jun 2007 18:26:17 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	Ingo Molnar <mingo@...e.hu>, Jeff Garzik <jeff@...zik.org>,
	Linus Torvalds <torvalds@...ux-foundation.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>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>, matthew.wilcox@...com
Subject: Re: [RFC PATCH 0/6] Convert all tasklets to workqueues

On 06/29, Steven Rostedt wrote:
> 
> On Fri, 29 Jun 2007, Alexey Kuznetsov wrote:
> >
> > static void measure_workqueue(void)
> > {
> > 	int i;
> > 	int cnt = 0;
> > 	unsigned long start;
> > 	DECLARE_WORK(test, do_test_wq, 0);
> > 	struct workqueue_struct * wq;
> >
> > 	start = jiffies;
> >
> > 	wq = create_workqueue("testq");

Also, create_workqueue() is very costly. The last 2 lines should be
reverted.

Oleg.

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