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Date: Fri, 8 Jul 2016 20:41:10 +0200
From: Borislav Petkov <bp@suse.de>
To: Ingo Molnar <mingo@kernel.org>
Cc: "Luck, Tony" <tony.luck@intel.com>, "Yu, Fenghua" <fenghua.yu@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        "Anvin, H Peter" <h.peter.anvin@intel.com>,
        Ingo Molnar <mingo@elte.hu>, Stephane Eranian <eranian@google.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Vikas Shivappa <vikas.shivappa@linux.intel.com>,
        "Shankar, Ravi V" <ravi.v.shankar@intel.com>,
        linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>
Subject: Re: [PATCH v2 2/3] Documentation, ABI: Add a document entry for
 cache id
Message-ID: <20160708184110.GD3938@pd.tnic>
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On Fri, Jul 08, 2016 at 08:07:46PM +0200, Ingo Molnar wrote:
> Who can we ... thank for that nonsensical naming? :-/
> 
> > E.g. on most Intel cpus you'll typically find "index0" is the L1-data cache, 
> > "index1" is the L1-instruction cache, "index3" is the L2-unified cache and 
> > "index4" is the L3-unified cache.
> 
> Crazy. What was wrong with using 'level' or 'depth'?

It is all there:

$ grep . /sys/devices/system/cpu/cpu0/cache/index?/level
/sys/devices/system/cpu/cpu0/cache/index0/level:1
/sys/devices/system/cpu/cpu0/cache/index1/level:1
/sys/devices/system/cpu/cpu0/cache/index2/level:2
/sys/devices/system/cpu/cpu0/cache/index3/level:3
$ grep . /sys/devices/system/cpu/cpu0/cache/index?/type
/sys/devices/system/cpu/cpu0/cache/index0/type:Data
/sys/devices/system/cpu/cpu0/cache/index1/type:Instruction
/sys/devices/system/cpu/cpu0/cache/index2/type:Unified
/sys/devices/system/cpu/cpu0/cache/index3/type:Unified



for i in /sys/devices/system/cpu/cpu0/cache/index?;
do
	l=$(cat $i/level)
	t=$(cat $i/type)

	printf "L%d-%s\n" $l $t
done

->

L1-Data
L1-Instruction
L2-Unified
L3-Unified

I believe the index naming is simply enumerating the caches...

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--