From: Andrew Morton <akpm@zip.com.au>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: torvalds@transmeta.com, linux-kernel@vger.kernel.org,
k-suganuma@mvj.biglobe.ne.jp
Subject: Re: [PATCH] 2.5.21 Nonlinear CPU support
Date: Tue, 11 Jun 2002 02:27:25 -0700 [thread overview]
Message-ID: <3D05C27D.186DC066@zip.com.au> (raw)
In-Reply-To: Your message of "Tue, 11 Jun 2002 00:42:32 MST." <3D05A9E8.FF0DA223@zip.com.au> <E17Hheq-0007r7-00@wagner.rustcorp.com.au>
Rusty Russell wrote:
>
> ...
> Let's not perpetuate the myth that everything in the kernel needs to
> be tuned to the last cycle at all costs, hm?
I was more concerned about the RAM use, actually.
This patch is an additional reason for CONFIG_NR_CPUS, but I've rather
gone cold on that idea because the "proper fix" is to make all those
huge per-cpu arrays dynamically allocated. So you can run a 64p kernel
on 2p without losing hundreds of k of memory and kernel address space.
But it looks like all those dynamically-allocated structures would
have to be allocated out to NR_CPUS anyway, to support hotplug, yes?
In which case, CONFIG_NR_CPUS is the only way to get the memory
back...
-
next prev parent reply other threads:[~2002-06-11 9:23 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-11 7:08 [PATCH] 2.5.21 Nonlinear CPU support Rusty Russell
2002-06-11 7:42 ` Andrew Morton
2002-06-11 9:09 ` Rusty Russell
2002-06-11 9:10 ` David S. Miller
2002-06-12 6:58 ` Rusty Russell
2002-06-12 9:26 ` David S. Miller
2002-06-13 5:01 ` Rusty Russell
2002-06-13 5:55 ` David S. Miller
2002-06-11 9:27 ` Andrew Morton [this message]
2002-06-11 11:22 ` Anton Altaparmakov
2002-06-12 5:57 ` Rusty Russell
2002-06-12 7:54 ` Anton Altaparmakov
2002-06-12 8:06 ` Rusty Russell
2002-06-12 8:25 ` Anton Altaparmakov
2002-06-12 19:32 ` Linus Torvalds
2002-06-12 13:10 ` Mikael Pettersson
2002-06-13 2:42 ` Rusty Russell
2002-06-12 0:53 ` Rusty Russell
2002-06-12 8:36 ` Helge Hafting
2002-06-11 10:57 ` Anton Altaparmakov
2002-06-11 17:59 ` Robert Love
2002-06-12 4:11 ` Rusty Russell
2002-06-11 19:29 ` Denis Vlasenko
2002-06-11 14:54 ` Anton Altaparmakov
2002-06-12 19:32 ` Denis Vlasenko
2002-06-12 15:08 ` Anton Altaparmakov
2002-06-12 17:36 ` Andreas Dilger
2002-06-12 18:34 ` Anton Altaparmakov
2002-06-12 19:39 ` Andreas Dilger
2002-06-12 20:41 ` Anton Altaparmakov
2002-06-12 21:03 ` Andreas Dilger
2002-06-12 21:15 ` Anton Altaparmakov
2002-06-12 20:03 ` H. Peter Anvin
2002-06-12 20:54 ` Robert Love
2002-06-12 20:57 ` Anton Altaparmakov
2002-06-12 22:21 ` H. Peter Anvin
2002-06-13 1:33 ` Anton Altaparmakov
2002-06-13 1:38 ` H. Peter Anvin
2002-06-13 1:45 ` Anton Altaparmakov
2002-06-13 2:13 ` H. Peter Anvin
2002-06-13 2:21 ` Anton Altaparmakov
2002-06-13 8:43 ` Helge Hafting
2002-06-11 18:01 ` Robert Love
2002-06-12 7:57 ` Alan Cox
2002-06-12 8:01 ` Rusty Russell
[not found] <Pine.LNX.4.33.0206121226550.1533-100000@penguin.transmeta. com>
2002-06-12 21:29 ` Anton Altaparmakov
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