linux-kernel - Re: [tip:x86/core] x86: Enable Intel Turbo Boost Max Technology 3.0

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Message-ID: <alpine.DEB.2.20.1611251951360.3602@nanos>
Date:   Fri, 25 Nov 2016 20:06:04 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ingo Molnar <mingo@...nel.org>
cc:     peterz@...radead.org, tim.c.chen@...ux.intel.com, hpa@...or.com,
        srinivas.pandruvada@...ux.intel.com, linux-kernel@...r.kernel.org,
        linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/core] x86: Enable Intel Turbo Boost Max Technology
 3.0

On Fri, 25 Nov 2016, Ingo Molnar wrote:

> 
> * tip-bot for Tim Chen <tipbot@...or.com> wrote:
> 
> > Commit-ID:  5e76b2ab36b40ca33023e78725bdc69eafd63134
> > Gitweb:     http://git.kernel.org/tip/5e76b2ab36b40ca33023e78725bdc69eafd63134
> > Author:     Tim Chen <tim.c.chen@...ux.intel.com>
> > AuthorDate: Tue, 22 Nov 2016 12:23:55 -0800
> > Committer:  Thomas Gleixner <tglx@...utronix.de>
> > CommitDate: Thu, 24 Nov 2016 20:44:19 +0100
> > 
> > x86: Enable Intel Turbo Boost Max Technology 3.0
> 
> This patch doesn't build:
> 
> Note that this patch has to be redone anyway, as it won't even build:

The branch where I merged it to builds fine. 

Though, yes I missed the asm/mutex.h include which obviously should be
linux/mutex.h

> > +#include <linux/sched.h>
> > +#include <linux/cpumask.h>
> > +#include <linux/cpuset.h>
> > +#include <asm/mutex.h>
> > +#include <linux/sched.h>
> > +#include <linux/sysctl.h>
> > +#include <linux/nodemask.h>
> 
> arch/x86/kernel/itmt.c:26:23: fatal error: asm/mutex.h: No such file or directory
> 
> > +config SCHED_ITMT
> > +	bool "Intel Turbo Boost Max Technology (ITMT) scheduler support"
> > +	depends on SCHED_MC && CPU_SUP_INTEL && X86_INTEL_PSTATE
> > +	---help---
> > +	  ITMT enabled scheduler support improves the CPU scheduler's decision
> > +	  to move tasks to cpu core that can be boosted to a higher frequency
> > +	  than others. It will have better performance at a cost of slightly
> > +	  increased overhead in task migrations. If unsure say N here.
> 
> Argh, so the 'itmt' name really sucks as well - could we please make it something 
> more obvious - like SCHED_INTEL_TURBO or so - and similarly rename the file as 
> well?
>
> The sched_intel_turbo.c file could thus host all things related to scheduler 
> support of turbo frequencies - it shouldn't be named after the Intel acronym of 
> the day...

It would be nice to come up with such nitpicks during review. This thing
went through 8 iterations, but nothing came up and I didn't mind the itmt
naming.

Thanks,

	tglx