From: Jamie Lokier <lk@tantalophile.demon.co.uk>
To: Richard Guenther <richard.guenther@student.uni-tuebingen.de>
Cc: kernel@kvack.org, "Stephen C. Tweedie" <sct@redhat.com>,
Linux Kernel List <linux-kernel@vger.rutgers.edu>,
glame-devel@lists.sourceforge.net, Linux-MM <linux-mm@kvack.org>
Subject: Re: mmap/munmap semantics
Date: Thu, 24 Feb 2000 16:15:30 +0100 [thread overview]
Message-ID: <20000224161530.G7129@pcep-jamie.cern.ch> (raw)
In-Reply-To: <Pine.LNX.4.10.10002241601460.27227-100000@linux14.zdv.uni-tuebingen.de>; from Richard Guenther on Thu, Feb 24, 2000 at 04:03:35PM +0100
Richard Guenther wrote:
> Oops, so I misread the code in drivers/char/mem.c ... well, so how can I
> get the same effect as for the private mapping? Not at the moment, I
> think? So memset should be faster than reading from /dev/zero?
Try them both. /dev/zero may be faster eventually, once kiobufs do
clever things. For the moment they should be about the same speed apart
from syscall entry cost, so zeroing a large region would be fine with
/dev/zero, and for a small region even when kiobufs are working, you
probably don't want the overhead of messing with page tables for a small
region.
enjoy,
-- Jamie
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next prev parent reply other threads:[~2000-02-24 15:15 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-02-22 17:46 Richard Guenther
2000-02-22 18:36 ` James Antill
2000-02-22 18:41 ` Benjamin C.R. LaHaise
2000-02-23 10:57 ` Richard Guenther
2000-02-23 15:58 ` Benjamin C.R. LaHaise
2000-02-24 10:06 ` Richard Guenther
2000-02-22 21:48 ` Richard Gooch
2000-02-23 3:49 ` Eric W. Biederman
2000-02-23 11:14 ` Richard Guenther
2000-02-23 15:44 ` Jamie Lokier
2000-02-23 18:48 ` Stephen C. Tweedie
2000-02-24 2:35 ` Jamie Lokier
2000-02-24 12:13 ` Stephen C. Tweedie
2000-02-24 12:24 ` Richard Guenther
2000-02-24 13:51 ` Stephen C. Tweedie
2000-02-24 15:01 ` kernel
2000-02-24 15:03 ` Richard Guenther
2000-02-24 15:15 ` Jamie Lokier [this message]
2000-02-24 13:06 ` lars brinkhoff
2000-02-24 14:42 ` Jamie Lokier
2000-02-24 13:41 ` Eric W. Biederman
2000-02-24 13:49 ` Stephen C. Tweedie
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