From: Ulrich Drepper <drepper@redhat.com>
To: Edgar Toernig <froese@gmx.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: hammer: MAP_32BIT
Date: Fri, 09 May 2003 17:58:02 -0700 [thread overview]
Message-ID: <3EBC4E9A.3090204@redhat.com> (raw)
In-Reply-To: <3EBC4119.B5C8F11A@gmx.de>
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Edgar Toernig wrote:
> Anyway, what's so bad about the idea someone (Linus?) suggested?
> Without MAP_FIXED the address given to mmap is already taken as a
> hint where to start looking for free memory.
The kernel fortunately already defines some semantics to using a
non-NULL first parameter without MAP_FIXED. It means: I prefer
*exactly* this address. If it's not available, give me anything else.
This is used and needed, for instance, when loading prelinked DSOs.
Now you want to give this another semantics. It would need at least one
more MAP_* flag.
Anyway, I don't care what the solution looks like. Changing existing
semantics should be out, that's the only requirement. Since I don't
plan on doing the work I have nothing to decide.
- --
- --------------. ,-. 444 Castro Street
Ulrich Drepper \ ,-----------------' \ Mountain View, CA 94041 USA
Red Hat `--' drepper at redhat.com `---------------------------
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next prev parent reply other threads:[~2003-05-10 0:45 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-09 7:35 hammer: MAP_32BIT Ulrich Drepper
2003-05-09 9:20 ` Andi Kleen
2003-05-09 11:28 ` mikpe
2003-05-09 11:38 ` Andi Kleen
2003-05-09 11:52 ` mikpe
2003-05-09 12:16 ` Andi Kleen
2003-05-09 18:11 ` H. Peter Anvin
2003-05-09 19:24 ` Ulrich Drepper
2003-05-09 20:55 ` H. Peter Anvin
2003-05-09 21:45 ` Ulrich Drepper
2003-05-09 22:07 ` H. Peter Anvin
2003-05-09 22:20 ` Ulrich Drepper
2003-05-09 22:21 ` H. Peter Anvin
2003-05-09 22:20 ` Timothy Miller
2003-05-09 22:20 ` H. Peter Anvin
2003-05-09 22:46 ` Timothy Miller
2003-05-09 23:24 ` H. Peter Anvin
2003-05-13 14:25 ` Timothy Miller
2003-05-09 22:22 ` Ulrich Drepper
2003-05-09 22:53 ` Timothy Miller
2003-05-09 23:24 ` Ulrich Drepper
2003-05-10 0:00 ` Edgar Toernig
2003-05-10 0:58 ` Ulrich Drepper [this message]
2003-05-10 2:51 ` Edgar Toernig
2003-05-09 17:36 ` H. Peter Anvin
2003-05-09 17:39 ` Ulrich Drepper
2003-05-10 1:48 ` Andi Kleen
2003-05-10 20:10 ` David Woodhouse
2003-05-13 18:54 ` H. Peter Anvin
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