linux-kernel - Re: [PATCH] sched: Make schedstats a runtime tunable that is disabled by default

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Date:	Tue, 26 Jan 2016 09:13:35 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Mel Gorman <mgorman@...hsingularity.net>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Mike Galbraith <mgalbraith@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] sched: Make schedstats a runtime tunable that is
 disabled by default


* Mel Gorman <mgorman@...hsingularity.net> wrote:

> -	ttwu_stat(p, smp_processor_id(), 0);
> +	if (schedstat_enabled())
> +		ttwu_stat(p, smp_processor_id(), 0);

Yeah. I actually like this for the cleanup factor as well: your patch makes it a 
_lot_ more obvious what is a statistics slowpath and what is not.

We tried to achieve that effect via the _stat() naming, but in hindsight that was 
a failure.

Thanks,

	Ingo