From: "H. Peter Anvin" <hpa@zytor.com>
To: Anton Altaparmakov <aia21@mole.bio.cam.ac.uk>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] 2.5.21 Nonlinear CPU support
Date: Wed, 12 Jun 2002 19:13:26 -0700 [thread overview]
Message-ID: <3D07FFC6.6060004@zytor.com> (raw)
In-Reply-To: <Pine.SGI.4.33.0206130241230.4638397-100000@mole.bio.cam.ac.uk>
Anton Altaparmakov wrote:
>
> allocate_compression_buffers() currently allocates all buffers up
> smp_num_cpus which is fine without hotswap cpus. Once hotswap cpus path
> goes in, then the allocation will be (pseudo code):
>
> for (i = 0; i < NR_CPUS; i++) {
> if (cpu_possible(i)) {
> ntfs_compression_buffer[i] = vmalloc();
> // TODO handle errors
> }
> }
>
> That means in words that we allocate buffers only once and for all
> existing cpu SOCKETS, i.e. including all potentially hotpluggable cpus
> which are currently offline. - If someone invents hotpluggable cpu sockets
> at some point then they should be burnt at the stake! (-;
>
Note that with my code, you don't allocate any memory until you have
actually seen a particular CPU being *used.* All very simple...
-hpa
next prev parent reply other threads:[~2002-06-13 2:13 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
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 [this message]
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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