From: Matt Mackall <mpm@selenic.com>
To: Ulrich Drepper <drepper@redhat.com>
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org, linux-tiny@selenic.com
Subject: Re: Fwd: [PATCH] Make sysenter support optional
Date: Thu, 29 Dec 2005 13:56:41 -0600 [thread overview]
Message-ID: <20051229195641.GB3356@waste.org> (raw)
In-Reply-To: <43B30E19.6080207@redhat.com>
On Wed, Dec 28, 2005 at 02:13:45PM -0800, Ulrich Drepper wrote:
> > This adds configurable sysenter support on x86. This saves about 5k on
> > small systems.
>
> You not only remove the sysenter support but also the vdso. And the
> later is a very bad idea. It is already today basically impossible to
> have reliable backtraces without the vdso and the unwind info it
> contains for signal handlers. And things can only get worse in future.
> The magic heuristics in the compiler are not reliable. It's simply the
> wrong face, this in a interface between the kernel and the libc, the
> compiler should not have such knowledge.
>
> The vdso should be mandatory for all configurations.
It's under CONFIG_EMBEDDED. Think uclibc. Think systems without
interactive shells.
--
Mathematics is the supreme nostalgia of our time.
next prev parent reply other threads:[~2005-12-29 20:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-28 21:24 [PATCH] Make sysenter support optional Matt Mackall
[not found] ` <a36005b50512281407x74415958tb0fa2b52f4dd7988@mail.gmail.com>
2005-12-28 22:13 ` Fwd: " Ulrich Drepper
2005-12-29 19:56 ` Matt Mackall [this message]
[not found] ` <a36005b50512291901l6a5acb77ha17d3552ea9c9fd9@mail.gmail.com>
2005-12-30 3:04 ` Ulrich Drepper
2005-12-30 3:38 ` Matt Mackall
2005-12-30 4:03 ` Ulrich Drepper
2005-12-30 11:20 ` Bernd Petrovitsch
2005-12-29 8:48 ` Ingo Molnar
2005-12-29 19:48 ` Matt Mackall
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