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From: Linus Torvalds <torvalds@transmeta.com>
To: Andi Kleen <ak@suse.de>
Cc: David Howells <dhowells@cambridge.redhat.com>,
	Andrew Morton <andrewm@uow.edu.au>, Ben LaHaise <bcrl@redhat.com>,
	Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] i386 rw_semaphores fix
Date: Tue, 10 Apr 2001 13:16:10 -0700 (PDT)	[thread overview]
Message-ID: <Pine.LNX.4.31.0104101313390.13071-100000@penguin.transmeta.com> (raw)
In-Reply-To: <20010410220551.A24251@gruyere.muc.suse.de>



On Tue, 10 Apr 2001, Andi Kleen wrote:
>
> I guess 386 could live with an exception handler that emulates it.

That approach is fine, although I'd personally prefer to take the
exception just once and just rewrite the instuction as a "call". The
places that need xadd would have to follow some strict guidelines (long
modrms or other instructions to pad out to enough size, and have the
arguments in fixed registers)

> (BTW an generic exception handler for CMPXCHG would also be very useful
> for glibc -- currently it has special checking code for 386 in its mutexes)
> The 386 are so slow that nobody would probably notice a bit more slowness
> by a few exceptions.

Ehh. I find that the slower the machine is, the more easily I _notice_
that it is slow. So..

		Linus


  reply	other threads:[~2001-04-10 20:16 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <3AD0FD0F.9B0C47FD@uow.edu.au>
2001-04-09  3:08 ` rw_semaphores Linus Torvalds
2001-04-09  4:18   ` rw_semaphores Linus Torvalds
2001-04-09 13:55     ` rw_semaphores Ben LaHaise
2001-04-10  2:41 ` rw_semaphores Tachino Nobuhiro
2001-04-10  5:43   ` rw_semaphores Linus Torvalds
2001-04-10  7:47     ` rw_semaphores David Howells
2001-04-10 18:02       ` [PATCH] i386 rw_semaphores fix David Howells
2001-04-10 19:42         ` Linus Torvalds
2001-04-10 19:56           ` x86 cpu configuration (was: Re: [PATCH] i386 rw_semaphores fix) Jeff Garzik
2001-04-10 21:58             ` Alan Cox
2001-04-10 20:05           ` [PATCH] i386 rw_semaphores fix Andi Kleen
2001-04-10 20:16             ` Linus Torvalds [this message]
2001-04-10 22:00             ` Alan Cox
2001-04-11  0:00               ` Andi Kleen
2001-04-11  0:13                 ` David Weinehall
2001-04-11  0:20                   ` Andi Kleen
2001-04-11  0:56                     ` David Weinehall
2001-04-11  1:04                       ` Andi Kleen
2001-04-11 12:32                     ` Alan Cox
2001-04-11  0:55                   ` Linus Torvalds
2001-04-11  1:07                     ` Andi Kleen
2001-04-11  1:12                       ` Linus Torvalds
2001-04-11  1:23                         ` Andi Kleen
2001-04-11 12:36                           ` Alan Cox
2001-04-11 18:05                     ` H. Peter Anvin
2001-04-11 12:28                 ` Alan Cox
2001-04-11 18:06                   ` H. Peter Anvin
2001-04-11 22:06                     ` Alan Cox
2001-04-11 22:42                       ` H. Peter Anvin
2001-04-11 22:55                         ` Alan Cox
2001-04-10 21:57           ` Alan Cox
2001-04-11  0:40             ` Tim Wright
2001-04-11  7:38           ` David Howells
2001-04-11 12:24             ` Maciej W. Rozycki
2001-04-11 12:57           ` [PATCH] 2nd try: " David Howells
2001-04-11 16:37             ` [PATCH] 3rd " David Howells
2001-04-11 21:41               ` [PATCH] 4th " David Howells
2001-04-12 18:16                 ` Andrew Morton
2001-04-11 23:00               ` [PATCH] 3rd " Anton Blanchard
2001-04-12 15:06                 ` [PATCH] i386 rw_semaphores, general abstraction patch David Howells
2001-04-11 16:56         ` [PATCH] i386 rw_semaphores fix Andrew Morton
2001-04-11 17:36           ` David Howells
2001-04-11 18:41             ` Linus Torvalds
2001-04-11 21:27           ` David Howells
2001-04-16 14:39       ` rw_semaphores yodaiken
2001-04-16 14:56         ` rw_semaphores Alan Cox
2001-04-16 17:05         ` rw_semaphores Linus Torvalds
2001-04-16 17:34           ` rw_semaphores yodaiken
2001-04-16 17:26         ` rw_semaphores Andrew Morton
2001-04-10  6:33   ` rw_semaphores Tachino Nobuhiro

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