linux-kernel - Re: [PATCH 3/3] x86, vdso32: handle 32 bit vDSO larger one page

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Message-ID: <20140313210010.GB3793@tassilo.jf.intel.com>
Date:	Thu, 13 Mar 2014 14:00:10 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...hat.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Stefani Seibold <stefani@...bold.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andreas Brief <Andreas.Brief@...de-schwarz.com>,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Martin Runge <Martin.Runge@...de-schwarz.com>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH 3/3] x86, vdso32: handle 32 bit vDSO larger one page

On Thu, Mar 13, 2014 at 12:58:35PM -0700, H. Peter Anvin wrote:
> On 03/13/2014 12:37 PM, Linus Torvalds wrote:
> > There are big advantages to "minimal code" at fixed addresses. The
> > vdso=native thing fills the page with 0xcc just to not give useful
> > instructions (still on my phone, so that may be a bogus memory)
> > 
> > That said, I doubt we care just for OpenSUSE 9. Let it be slower.
> 
> Yes.

At some point the majority of my nfsroot test image were OpenSUSE 9.
It was the last opensuse system that booted fast without udev or initrd :-)

I have mostly retired them by now, but still occasional usage.

So that why i would prefer to not cripple it.

-Andi
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