From: torvalds@transmeta.com (Linus Torvalds)
To: linux-kernel@vger.kernel.org
Subject: Re: [Bug 350] New: i386 context switch very slow compared to 2.4 due to wrmsr (performance)
Date: Wed, 12 Feb 2003 17:24:08 +0000 (UTC) [thread overview]
Message-ID: <b2dvvo$7n5$1@penguin.transmeta.com> (raw)
In-Reply-To: 20030212101831.GB10422@bjl1.jlokier.co.uk
In article <20030212101831.GB10422@bjl1.jlokier.co.uk>,
Jamie Lokier <jamie@shareable.org> wrote:
>
>I meant: the trampoline _stack_ lives in the TSS.
>
>There is no trampoline _code_.
Ahh, ok. That sounds quite doable, and all my complaints go away.
It still leaves the debug exception and NMI issue.
The debug exception case is easy to trigger: use gdb to single-step
through the user-lebel fast system call code, and you _will_ get a debug
exception on the very first kernel instruction (which is also the one
that doesn't have a valid stack).
So anybody want to actually try to implement this?
Linus
next prev parent reply other threads:[~2003-02-12 17:17 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-12 1:35 [Bug 350] New: i386 context switch very slow compared to 2.4 due to wrmsr (performance) Martin J. Bligh
2003-02-12 2:59 ` Dave Jones
2003-02-12 4:21 ` Jamie Lokier
2003-02-12 5:49 ` Linus Torvalds
2003-02-12 10:12 ` Jamie Lokier
2003-03-10 3:07 ` Linus Torvalds
2003-03-10 11:06 ` Andi Kleen
2003-03-10 18:33 ` Linus Torvalds
2003-03-10 22:44 ` Linus Torvalds
2003-02-12 12:54 ` Dave Jones
2003-02-12 7:50 ` Andi Kleen
2003-02-12 10:27 ` Jamie Lokier
2003-02-12 10:45 ` Andi Kleen
2003-02-12 17:52 ` Ingo Oeser
2003-02-12 18:13 ` Dave Jones
2003-02-12 18:18 ` Andi Kleen
2003-02-13 2:42 ` Alan Cox
2003-02-13 5:17 ` Eric W. Biederman
2003-02-13 18:07 ` Andi Kleen
2003-02-14 0:14 ` [discuss] " Peter Tattam
2003-02-14 1:29 ` Andi Kleen
2003-02-14 1:51 ` Eric Northup
2003-02-14 2:01 ` Peter Tattam
2003-02-14 4:07 ` Thomas J. Merritt
2003-02-14 9:38 ` Peter Finderup Lund
2003-02-14 8:27 ` Eric W. Biederman
2003-03-19 1:22 ` Rob Landley
2003-02-12 4:18 ` Jamie Lokier
2003-02-12 5:54 ` Linus Torvalds
2003-02-12 10:18 ` Jamie Lokier
2003-02-12 17:24 ` Linus Torvalds [this message]
2003-03-18 15:24 ` Kevin Pedretti
2003-03-18 16:41 ` Linus Torvalds
2003-03-18 18:30 ` Brian Gerst
2003-03-18 19:14 ` Thomas Molina
2003-03-18 19:21 ` Linus Torvalds
2003-03-18 20:03 ` Thomas Schlichter
2003-03-18 20:24 ` Steven Cole
2003-03-19 0:42 ` H. Peter Anvin
2003-03-19 2:22 ` george anzinger
[not found] <20030318165013$55f4@gated-at.bofh.it>
[not found] ` <20030318184010$6448@gated-at.bofh.it>
2003-03-18 20:19 ` Pascal Schmidt
-- strict thread matches above, loose matches on Subject: below --
2003-03-19 9:55 Ph. Marek
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