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From: Andrea Arcangeli <andrea@suse.de>
To: Richard Henderson <rth@redhat.com>
Cc: Linus Torvalds <torvalds@transmeta.com>,
	Ingo Molnar <mingo@elte.hu>,
	linux-kernel@vger.kernel.org
Subject: Re: unregistered changes to the user<->kernel API
Date: Thu, 14 Jun 2001 19:47:57 +0200	[thread overview]
Message-ID: <20010614194757.B715@athlon.random> (raw)
In-Reply-To: <20010614191219.A30567@athlon.random> <20010614191634.B30567@athlon.random> <20010614192122.C30567@athlon.random> <20010614103249.A28852@redhat.com>
In-Reply-To: <20010614103249.A28852@redhat.com>; from rth@redhat.com on Thu, Jun 14, 2001 at 10:32:49AM -0700

On Thu, Jun 14, 2001 at 10:32:49AM -0700, Richard Henderson wrote:
> within glibc, and (2) making these accesses slower since they
> will be considered O_DIRECT after the change.

and then read/write will return -EINVAL which is life-threatening.
O_DIRECT like rawio via /dev/raw imposes special buffer size and
alignment (size multiple of softblocksize of the fs and softblocksize
alignment, at max I can turn it down to hardblocksize without intensive
changes and guaranteeing zerocopy [modulo bounce buffers on x86 of
course]).

So in short at least glibc would need to be replaced...

Andrea

  reply	other threads:[~2001-06-14 17:48 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-06-14 17:12 unregistered changes to the user<->kernel API Andrea Arcangeli
2001-06-14 17:16 ` Andrea Arcangeli
2001-06-14 17:21   ` Andrea Arcangeli
2001-06-14 17:32     ` Richard Henderson
2001-06-14 17:47       ` Andrea Arcangeli [this message]
2001-06-14 18:16         ` Andrea Arcangeli
2001-06-14 18:17         ` Richard Henderson
2001-06-14 18:10       ` Alexander Viro
2001-06-14 17:25 ` Jeff Garzik
2001-06-14 17:44   ` Andrea Arcangeli
2001-06-14 17:52     ` Jeff Garzik
2001-06-14 18:03       ` Andrea Arcangeli
2001-06-14 18:11         ` Alan Cox
2001-06-14 18:27           ` Andrea Arcangeli
2001-06-14 21:43           ` Albert D. Cahalan

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