linux-kernel - Re: [PATCH 13/15] sched: Use a static_key for sched_clock

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Message-ID: <20140122184511.GB389@x4>
Date:	Wed, 22 Jan 2014 19:45:11 +0100
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	Arjan van de Ven <arjan@...ux.intel.com>, lenb@...nel.org,
	rjw@...ysocki.net, Eliezer Tamir <eliezer.tamir@...ux.intel.com>,
	rui.zhang@...el.com, jacob.jun.pan@...ux.intel.com,
	Mike Galbraith <bitbucket@...ine.de>,
	Ingo Molnar <mingo@...nel.org>, hpa@...or.com,
	paulmck@...ux.vnet.ibm.com, Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <john.stultz@...aro.org>,
	Andy Lutomirski <luto@...capital.net>,
	linux-kernel@...r.kernel.org, dyoung@...hat.com
Subject: Re: [PATCH 13/15] sched: Use a static_key for sched_clock_stable

On 2014.01.22 at 19:42 +0100, Peter Zijlstra wrote:
> On Wed, Jan 22, 2014 at 07:35:38PM +0100, Markus Trippelsdorf wrote:
> 
> > >FYI it happens on real hardware on my machine:
> 
> > >[   60.375384] process: using AMD E400 aware idle routine
> 
> > But this is a different issue. I've bisected it to:
> > 
> > commit 20d1c86a57762f0a33a78988e3fc8818316badd4
> > Author: Peter Zijlstra <peterz@...radead.org>
> > Date:   Fri Nov 29 15:40:29 2013 +0100
> > 
> >     sched/clock, x86: Rewrite cyc2ns() to avoid the need to disable IRQs
> > 
> > Reverting the commit "fixes" the issue:
> 
> Hurm.. what kind of AMD machine is that?

It's an ancient one:

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 16
model           : 4
model name      : AMD Phenom(tm) II X4 955 Processor
stepping        : 2
microcode       : 0x10000db
cpu MHz         : 800.000
cache size      : 512 KB
physical id     : 0
siblings        : 4
core id         : 0
cpu cores       : 4
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3
dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit 
wdt hw_pstate npt lbrv svm_lock nrip_save
bogomips        : 6424.73
TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate



-- 
Markus
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