linux-kernel - Re: vmstat: use our own timer events

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Date:	Mon, 30 Apr 2007 07:12:08 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Christoph Lameter <clameter@....com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: vmstat: use our own timer events

Christoph Lameter wrote:
> On Sun, 29 Apr 2007, Andrew Morton wrote:
> 
>>> on each node at the second and then each of the other processor on a
>>> node on a subsequent tick. That may be useful to keep a large amount
>>> of the second free of timer activity. Maybe the timer folks will have
>>> some feedback on this one?
>> The one-per-second timer interrupt will upset the people who are really
>> aggressive about power consumption (eg, OLPC).  Perhaps there isn't (yet)
>> an intersection between those people and SMP.
> 
> Well the cache_reaper of SLAB hits hard todays anyways. This will help
> if they switch to slub because the counter consolidation is much lighter 
> weight.

it's not about the weight. It's about waking up *at all*. I've been working
really hard to get a system with a reasonable average idle time (600ms+), but
I obviously had to patch the SLAB reaper to be at a different resolution...

> 
> I am fine with delaying this. I just wanted the timer guys to have a 
> chance to shape this a bit. Not sure what they want. What they did to the 
> cache_reaper in 2.6.20/21 is bad.

HUH? The cache_reaper DID NOT CHANGE with the round_jiffies() change.
Before it had a 3 jiffies per cpu offset, after it has a 3 jiffies per cpu offset.
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