This is the mail archive of the libc-alpha@sourceware.org mailing list for the glibc project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: X86-64 vsyscall is removed from Linux kernel 3.1.

From: Ulrich Drepper <drepper at gmail dot com>
To: "H.J. Lu" <hjl dot tools at gmail dot com>
Cc: GNU C Library <libc-alpha at sourceware dot org>
Date: Mon, 29 Aug 2011 15:05:40 -0400
Subject: Re: X86-64 vsyscall is removed from Linux kernel 3.1.
References: <CAMe9rOpgkMO1i00OhT3-e_9tRiDgN5-Hqm-Xn7f29_fbvA1SPw@mail.gmail.com>

On Wed, Aug 24, 2011 at 10:53, H.J. Lu <hjl.tools@gmail.com> wrote:
> X86-64 vsyscall has been removed from Linux kernel 3.1 and
> has been emulated with syscall instruction. ÂSo for kernel 3.1
> and above, vsyscall is slower than direct syscall instruction.
> I think glibc should try vdso first and fall back to direct syscall
> instruction.

That's already done.  Where do you think there is a problem?

Follow-Ups:
- Re: X86-64 vsyscall is removed from Linux kernel 3.1.
  - From: H.J. Lu

References:
- X86-64 vsyscall is removed from Linux kernel 3.1.
  - From: H.J. Lu

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]