From: Pavel Machek <pavel@ucw.cz>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: vojtech@ucw.cz, Alan Cox <alan@lxorguk.ukuu.org.uk>,
"J.E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
john stultz <johnstul@us.ibm.com>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: Voyager subarchitecture for 2.5.46
Date: Sun, 10 Nov 2002 20:18:23 +0100 [thread overview]
Message-ID: <20021110191822.GA1237@elf.ucw.cz> (raw)
In-Reply-To: <Pine.LNX.4.44.0211101050170.9581-100000@home.transmeta.com>
Hi!
> > Unfortunately, this means "bye bye vsyscalls for gettimeofday".
>
> Not necessarily. All of the fastpatch and the checking can be done by the
> vsyscall, and if the vsyscall notices that there is a backwards jump
> in
I believe you need to *store* last value given to userland. Checking
backwards jump can be dealt with, but to check for time going
backwards you need to *store* result each result of vsyscall. I do not
think that can be done from userlnad.
> That said, I suspect that the real issue with vsyscalls is that they don't
> really make much sense. The only system call we've ever found that matters
> at all is gettimeofday(), and the vsyscall implementation there looks like
> a "cool idea, but doesn't really matter (and complicates things a lot)".
I don't like vsyscalls at all...
Pavel
--
When do you have heart between your knees?
next prev parent reply other threads:[~2002-11-10 19:13 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-05 20:45 Voyager subarchitecture for 2.5.46 J.E.J. Bottomley
2002-11-06 2:31 ` john stultz
2002-11-06 13:43 ` Alan Cox
2002-11-06 21:35 ` john stultz
2002-11-06 15:03 ` J.E.J. Bottomley
2002-11-06 15:38 ` Alan Cox
2002-11-06 16:09 ` Christer Weinigel
2002-11-06 15:45 ` Linus Torvalds
2002-11-06 16:19 ` Alan Cox
2002-11-06 16:12 ` Linus Torvalds
2002-11-06 16:45 ` Alan Cox
2002-11-10 16:30 ` Pavel Machek
2002-11-10 18:59 ` Linus Torvalds
2002-11-10 19:18 ` Pavel Machek [this message]
2002-11-10 19:31 ` Linus Torvalds
2002-11-10 19:42 ` Pavel Machek
2002-11-10 19:48 ` Vojtech Pavlik
2002-11-10 20:02 ` Sean Neakums
2002-11-10 20:16 ` Lars Marowsky-Bree
2002-11-10 22:11 ` Alan Cox
2002-11-10 19:46 ` Vojtech Pavlik
2002-11-11 20:40 ` john stultz
2002-11-11 20:57 ` J.E.J. Bottomley
2002-11-11 21:36 ` William Lee Irwin III
2002-11-11 21:58 ` john stultz
2002-11-11 22:49 ` J.E.J. Bottomley
2002-11-11 23:12 ` john stultz
2002-11-12 12:16 ` Pavel Machek
2002-11-11 22:08 ` Vojtech Pavlik
2002-11-06 20:07 ` john stultz
2002-11-06 22:36 ` H. Peter Anvin
2002-11-06 19:30 ` john stultz
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