From: "Stephen C. Tweedie" <sct@redhat.com>
To: James Simmons <jsimmons@edgeglobal.com>
Cc: "Stephen C. Tweedie" <sct@redhat.com>, Linux MM <linux-mm@kvack.org>
Subject: Re: MMIO regions
Date: Mon, 4 Oct 1999 20:35:34 +0100 (BST) [thread overview]
Message-ID: <14329.390.453805.801086@dukat.scot.redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.10.9910041428030.8295-100000@imperial.edgeglobal.com>
Hi,
On Mon, 4 Oct 1999 14:29:14 -0400 (EDT), James Simmons
<jsimmons@edgeglobal.com> said:
> Okay. But none of this prevents a rogue app from hosing your system. Such
> a process doesn't have to bother with locks or semaphores.
And we talked about this before. You _can_ make such a guarantee, but
it is hideously expensive especially on SMP. You either protect the
memory or the CPU against access by the other app, and that requires
either scheduler or VM interrupts between CPUs.
--Stephen
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next prev parent reply other threads:[~1999-10-04 19:35 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-10-04 14:38 James Simmons
1999-10-04 15:31 ` Stephen C. Tweedie
1999-10-04 15:52 ` James Simmons
1999-10-04 16:02 ` Benjamin C.R. LaHaise
1999-10-04 17:27 ` James Simmons
1999-10-04 17:56 ` Benjamin C.R. LaHaise
1999-10-04 18:26 ` James Simmons
1999-10-04 19:19 ` Stephen C. Tweedie
1999-10-06 20:15 ` James Simmons
1999-10-11 17:09 ` Stephen C. Tweedie
1999-10-11 17:26 ` Jeff Garzik
1999-10-11 23:14 ` James Simmons
1999-10-11 17:57 ` James Simmons
1999-10-04 16:11 ` Stephen C. Tweedie
1999-10-04 18:29 ` James Simmons
1999-10-04 19:35 ` Stephen C. Tweedie [this message]
1999-10-07 19:40 ` James Simmons
1999-10-10 11:24 ` Rik Faith
1999-10-10 14:03 ` Eric W. Biederman
1999-10-10 18:46 ` Rik Faith
1999-10-11 0:21 ` James Simmons
1999-10-11 10:59 ` Rik Faith
1999-10-11 3:38 ` Eric W. Biederman
1999-10-10 14:21 ` James Simmons
1999-10-11 17:22 ` Stephen C. Tweedie
1999-10-04 16:58 ` Marcus Sundberg
1999-10-04 18:27 ` James Simmons
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