linux-kernel - Re: fast path cycle muncher (vmstat: make vmstat_updater deferrable again and shut down on idle)

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Message-ID: <alpine.DEB.2.20.1601261233400.2181@east.gentwo.org>
Date:	Tue, 26 Jan 2016 12:34:10 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
cc:	Michal Hocko <mhocko@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: fast path cycle muncher (vmstat: make vmstat_updater deferrable
 again and shut down on idle)

On Tue, 26 Jan 2016, Mike Galbraith wrote:

> I disagree.  You're burning electrons for no benefit at all to me on my
> box.  You want to do high speed trading, that's fine, but I expect my
> box to be able to pop in and out of idle without having to pay a toll
> to the high speed trading bandits of the world, thank you very much.
>
> This specialty thing does not belong in the generic fast path.

The system going idle is a fastpath. Mind boogling.