linux-kernel - Re: [PATCH 0/4] x86-64: fix vclock

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Message-Id: <1242311260.19219.22.camel@nathan.suse.cz>
Date:	Thu, 14 May 2009 16:27:40 +0200
From:	Petr Tesarik <ptesarik@...e.cz>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, linux-x86_64@...r.kernel.org,
	mingo@...e.hu, zwane@....linux.org.uk
Subject: Re: [PATCH 0/4] x86-64: fix vclock_gettime()

Andi Kleen píše v Čt 14. 05. 2009 v 16:02 +0200:
> > Sorry, this doesn't work, because the function is inlined. And even if
> > it wasn't, the vDSO must be self-contained by definition. User-space
> > cannot simply call into kernel-space.
> 
> Wrong, it can call into vsyscall space.

Ah, yes, you're right. The vsyscall is always mapped and it is a special
case for the instruction replacement code already.

So, is there any reason not to put the rdtsc_barrier() around
vget_cycles() in vread_tsc() ?

Petr Tesarik


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