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

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Message-ID: <1453833939.3534.68.camel@gmail.com>
Date:	Tue, 26 Jan 2016 19:45:39 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Christoph Lameter <cl@...ux.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, 2016-01-26 at 12:34 -0600, Christoph Lameter wrote:
> 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.

Hohum, noted.  Now what about those cycles, and the sleeping lock you
injected for -rt?

	-Mike