linux-kernel - Re: [PATCHSET] timer: clean up initializers and implement irqsafe timers

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Date:	Wed, 15 Aug 2012 12:58:27 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	mingo@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCHSET] timer: clean up initializers and implement irqsafe
 timers

On Tue, 2012-08-14 at 17:18 -0700, Tejun Heo wrote:
> Let's see if we can agree on the latter point first.  Do you agree
> that it wouldn't be a good idea to implement relatively complex timer
> subsystem inside workqueue? 

RB-trees are fairly trivial to use, but can we please get back to why
people want to do del/mod delayed work from IRQ context?

I can get the queueing part, but why do they need to cancel and or
modify stuff?

Trying to come up with a solution to a problem you don't understand is
kinda difficult.
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