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

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Message-ID: <20070629162144.GA17709@ms2.inr.ac.ru>
Date:	Fri, 29 Jun 2007 20:21:44 +0400
From:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Ingo Molnar <mingo@...e.hu>, Jeff Garzik <jeff@...zik.org>,
	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>,
	"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

Hello!

> If I understand correctly, this is because tasklet_head.list is protected
> by local_irq_save(), and t could be scheduled on another CPU, so we just
> can't steal it, yes?

Yes. All that code is written to avoid synchronization as much as possible.


> If we use worqueues, we can change the semantics of tasklet_kill() so
> that it really cancels an already scheduled tasklet.
> 
> The question is: would it be the wrong/good change?

If it does not add another usec to tasklet_schedule(), it would be good.

Alexey
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