From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: flar@pants.nu (Brad Boyer)
Cc: dwmw2@infradead.org (David Woodhouse),
aia21@cam.ac.uk (Anton Altaparmakov),
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: ANN: New NTFS driver (2.0.0/TNG) now finished.
Date: Mon, 25 Mar 2002 12:32:47 +0000 (GMT) [thread overview]
Message-ID: <E16pTeZ-0000PD-00@the-village.bc.nu> (raw)
In-Reply-To: <20020325115026.1FCAD24DB5@marcus.pants.nu> from "Brad Boyer" at Mar 25, 2002 03:50:26 AM
> file unaligned.h. I suspect that at least some of
> these allow for an exception handler to fake the
> capability in user space programs, but that isn't
> something you can allow inside the kernel.
The Linux kernel assumes and requires that a processor handles alignment
faults and fixups in kernel space.
This is done because there are many cases where an object is almost always
aligned and it is faster to assume alignment than to mess around with every
single chunk of data. Its tuned so those alignment traps should not be
occurring at a high rate.
Alan
next prev parent reply other threads:[~2002-03-25 12:17 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-25 2:26 Anton Altaparmakov
2002-03-25 8:32 ` David Woodhouse
2002-03-25 11:50 ` Brad Boyer
2002-03-25 12:32 ` Alan Cox [this message]
2002-03-25 12:52 ` Jeff Garzik
2002-03-25 8:38 ` Christoph Hellwig
2002-03-25 17:17 ` Grogan
2002-03-25 19:13 ` Anton Altaparmakov
2002-03-25 19:47 ` Bill Davidsen
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