linux-kernel - Re: [patch 13/20] timer: Switch to a non cascading wheel

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Date:	Thu, 16 Jun 2016 18:09:31 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Arjan van de Ven <arjanvandeven@...il.com>
cc:	Eric Dumazet <edumazet@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Chris Mason <clm@...com>,
	Arjan van de Ven <arjan@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	George Spelvin <linux@...encehorizons.net>
Subject: Re: [patch 13/20] timer: Switch to a non cascading wheel

On Thu, 16 Jun 2016, Arjan van de Ven wrote:

> I think there's 2 elements on the interface.
> 
> 1) having a relative interface to the current time (avoid use of
> absolute jiffies in drivers)

That's the easy part :)
 
> 2) having wallclock units. Making HZ always be 1000 is effectively
> doing that as well (1 msec after all)

Right. And it allows us to switch over the whole code base w/o fiddling with
it in one go. Cleanups should obviously take place after that.

Thanks,

	tglx