From: Arjan van de Ven <arjan@infradead.org>
To: Willy Tarreau <willy@w.ods.org>
Cc: Marcelo Tosatti <marcelo.tosatti@cyclades.com>,
linux-kernel@vger.kernel.org, davej@redhat.com
Subject: Re: Linux 2.4.30-rc2
Date: Sat, 26 Mar 2005 12:46:19 +0100 [thread overview]
Message-ID: <1111837579.8042.5.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <20050326113426.GO30052@alpha.home.local>
On Sat, 2005-03-26 at 12:34 +0100, Willy Tarreau wrote:
> Marcelo,
>
> just another one and that's all. Zachary Amsden found an unconditional
> write to a debug register in the signal delivery path which is only
> needed when we use a breakpoint. This is a very expensive operation on
> x86, and doing it conditionnaly enhanced signal delivery speed by 33%
> for him.
this sounds rather risky for this late in the game; heck it sounds risky
in 2.4 period. This code changed a lot in 2.6 so just a plain backport
is by no means risk free, while the effect of a wrong debug register can
even have security impact.
next prev parent reply other threads:[~2005-03-26 11:46 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-26 0:46 Marcelo Tosatti
2005-03-26 10:42 ` Willy Tarreau
2005-03-26 10:50 ` Willy Tarreau
2005-03-26 10:59 ` Willy Tarreau
2005-03-26 21:41 ` David S. Miller
2005-03-26 11:22 ` Willy Tarreau
2005-03-26 11:44 ` Arjan van de Ven
2005-03-26 12:27 ` Willy Tarreau
2005-03-26 16:07 ` Marcelo Tosatti
2005-03-26 11:34 ` Willy Tarreau
2005-03-26 11:46 ` Arjan van de Ven [this message]
2005-03-26 12:29 ` Willy Tarreau
2005-03-27 17:50 ` Andi Kleen
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=1111837579.8042.5.camel@laptopd505.fenrus.org \
--to=arjan@infradead.org \
--cc=davej@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=marcelo.tosatti@cyclades.com \
--cc=willy@w.ods.org \
/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
all inboxes | Powered by JetHome®