linux-kernel - Re: [PATCH] x86, cpu: trivial printk formatting fixes

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Date:	Sat, 1 Nov 2014 18:51:29 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Steven Honeyman <stevenhoneyman@...il.com>
Cc:	Joe Perches <joe@...ches.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jiri Kosina <trivial@...nel.org>,
	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86, cpu: trivial printk formatting fixes

On Sat, Nov 01, 2014 at 05:38:18PM +0000, Steven Honeyman wrote:
> On 1 November 2014 17:19, Borislav Petkov <bp@...en8.de> wrote:
> > On Sat, Nov 01, 2014 at 03:44:56PM +0000, Steven Honeyman wrote:
> >> A 2 line printk makes dmesg output messy, because the second line does not get a timestamp.
> >> For example:
> >>
> >> [    0.012863] CPU0: Thermal monitoring enabled (TM1)
> >> [    0.012869] Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024
> >> Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4
> >> [    0.012958] Freeing SMP alternatives memory: 28K (ffffffff81d86000 - ffffffff81d8d000)
> >> [    0.014961] dmar: Host address width 39
> >
> > It looks just fine here, albeit with repeated timestamp:
> >
> > $ dmesg | grep -E "[id]TLB"
> > [    0.269607] Last level iTLB entries: 4KB 512, 2MB 1024, 4MB 512
> > [    0.269607] Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 512, 1GB 0
> 
> That's strange! Is it the same for the other one? I just double

dmesg | grep ENERGY
[    0.061976] ENERGY_PERF_BIAS: Set to 'normal', was 'performance'
[    0.061976] ENERGY_PERF_BIAS: View and update with x86_energy_perf_policy(8)

> checked on the slight chance I had an alias causing problems etc, but
> that wasn't the case:
> 
> $ 'dmesg'|'grep' ENERGY
> [    0.010557] ENERGY_PERF_BIAS: Set to 'normal', was 'performance'
> ENERGY_PERF_BIAS: View and update with x86_energy_perf_policy(8)
> $ dmesg --version && grep --version
> dmesg from util-linux 2.25.2
> grep (GNU grep) 2.20

$ dmesg --version && grep --version
dmesg from util-linux 2.20.1
grep (GNU grep) 2.20

I've upgraged util-linux (for dmesg) on the other box:

$ dmesg --version && grep --version
dmesg from util-linux 2.25.1
grep (GNU grep) 2.18

and now I get:

dmesg | grep -E "[id]TLB"
[    0.269607] Last level iTLB entries: 4KB 512, 2MB 1024, 4MB 512
Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 512, 1GB 0

So I'd say it looks like a regression in dmesg itself.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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