From: Ulrich Drepper <drepper@redhat.com>
To: mpm@selenic.com, akpm@osdl.org
Cc: linux-kernel@vger.kernel.org, linux-tiny@selenic.com
Subject: Re: Fwd: [PATCH] Make sysenter support optional
Date: Wed, 28 Dec 2005 14:13:45 -0800 [thread overview]
Message-ID: <43B30E19.6080207@redhat.com> (raw)
In-Reply-To: <a36005b50512281407x74415958tb0fa2b52f4dd7988@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 708 bytes --]
> 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.
--
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 251 bytes --]
next prev parent reply other threads:[~2005-12-28 22:14 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 ` Ulrich Drepper [this message]
2005-12-29 19:56 ` Fwd: " Matt Mackall
[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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=43B30E19.6080207@redhat.com \
--to=drepper@redhat.com \
--cc=akpm@osdl.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-tiny@selenic.com \
--cc=mpm@selenic.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox