linux-kernel - Re: New vsyscall emulation breaks JITs

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Message-ID: <4E3C571C.1070903@zytor.com>
Date:	Fri, 05 Aug 2011 13:48:28 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andrew Lutomirski <luto@....edu>
CC:	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	lueckintel@...oo.com, kimwooyoung@...il.com
Subject: Re: New vsyscall emulation breaks JITs

On 08/05/2011 01:45 PM, Andrew Lutomirski wrote:
> 
> hpa: time is supported (as of 3.0) by the vdso, and very new glibc
> uses the vdso version.  We could add a native time implementation back
> to the vsyscall page without too much pain as a short-term fix, but
> that would be less than ideal.
> 

How new does glibc have to be?

How much of a pain would it be to make the legacy vs emulated vsyscall
page a config option?

	-hpa
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