From: "Stephen C. Tweedie" <sct@redhat.com>
To: Gilles Pokam <pokam@cs.tu-berlin.de>
Cc: linux-mm@kvack.org
Subject: Re: mmap operation
Date: Mon, 10 May 1999 22:19:41 +0100 (BST) [thread overview]
Message-ID: <14135.19821.176947.167396@dukat.scot.redhat.com> (raw)
In-Reply-To: <199905101602.SAA11187@zange.cs.tu-berlin.de>
Hi,
On Mon, 10 May 1999 18:02:10 +0200 (MET DST), Gilles Pokam
<pokam@cs.tu-berlin.de> said:
> I have implemented a module for buffer management in the 2.0.34 linux
> kernel. Now i'm using the write and read method for transfering data
> between the kernel and user space. I have noticed that the overhead of
> these 2 operations are quite big, because each time a system call is
> invoked. So i decided to improve my module by implementing the mmap
> operation. The mmap operation works well when mapping only one page
> size. But above this size, for example with an order of at least 1,
> the later operation fails to work! I have noticed that above 4096 (one
> page) bytes the zero page is mapped instead! Could someone help mee
> solve this problem ? (i use the nopage operation in my mmap method and
> cluster of 16 pages).
The entire VM works by mapping single pages. It would be a large task
to change this.
--Stephen
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prev parent reply other threads:[~1999-05-10 21:19 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-05-10 16:02 Gilles Pokam
1999-05-10 21:19 ` Stephen C. Tweedie [this message]
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