linux-kernel - Re: how to tell i386 from x86-64 kernel

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Message-Id: <1201862849.6193.22.camel@lois>
Date:	Fri, 01 Feb 2008 11:47:29 +0100
From:	Rik Bobbaers <Rik.Bobbaers@...s.kuleuven.be>
To:	linux-kernel@...r.kernel.org
Subject: Re: how to tell i386 from x86-64 kernel

hi there,

since i'm not on the list... how about:

tail /proc/1/smaps and check the address size...
on 32 bit: ffffe000-fffff000 r-xp 00000000 00:00 0          [vdso]

on 64 bit: ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0
[vdso]

there you can clearly see that your address space is double... so
there's your 32 bit vs 64 bit

as a normal user, you can do the same but with your own processes

greetings,

> Hi!
> 
> Quiz: on a booted system, how do you tell 32bit from 64bit kernel?
> 
> A1: zcat /proc/config.gz | grep CONFIG_64
> ...but config.gz is optional
> 
> A2: cat /proc/meminfo  | grep High
> ...but i386 kernel could have highmem disabled
> 
> What is _your_ answer? ;-)>

-- 
harry
aka Rik Bobbaers

K.U.Leuven - LUDIT            -=- Tel: +32 485 52 71 50
Rik.Bobbaers@...s.kuleuven.be -=- http://harry.enzoverder.be

Don't steal - the government hates competition.



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