From: Dave Hansen <haveblue@us.ibm.com>
To: ncunningham@linuxmail.org
Cc: Pavel Machek <pavel@ucw.cz>,
Linux Memory Management <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Suspend 2 merge: 43/51: Utility functions.
Date: Sat, 27 Nov 2004 08:11:14 -0800 [thread overview]
Message-ID: <1101571874.8940.4383.camel@localhost> (raw)
In-Reply-To: <1101427475.27250.170.camel@desktop.cunninghams>
On Thu, 2004-11-25 at 16:04, Nigel Cunningham wrote:
> On Fri, 2004-11-26 at 10:46, Pavel Machek wrote:
> > How many bits do you need? Two? I'd rather use thow two bits than have
> > yet another abstraction. Also note that it is doing big order
> > allocation.
>
> Three if checksumming is enabled IIRC. I'll happily use normal page
> flags, but we only need them when suspending, and I understood they were
> rarer than hen's teeth :>
>
> MM guys copied so they can tell me I'm wrong :>
Please remember that, in almost all cases, any use of page->flags can be
replaced by a simple list. Is a page marked foo? Well, just traverse
this data structure and see if the page is in there. It might be a
stinking slow check, but it will *work*.
I think we're up to using 1 bit in the memory hotplug code, but we don't
even need that if some operations can be implemented more slowly.
An extreme example:
struct list_head foo;
int PageSuspendFoo(page)
{
ret = 0;
lock();
list_for_each(foo, bar) {
if (page == bar)
ret = 1;
}
unlock();
return ret;
}
-- Dave
next prev parent reply other threads:[~2004-11-27 16:11 UTC|newest]
Thread overview: 241+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-24 12:56 Suspend 2 merge Nigel Cunningham
2004-11-24 12:56 ` Suspend2 merge: 1/51: Device trees Nigel Cunningham
2004-11-24 12:56 ` Suspend2 merge: 2/51: Find class by name Nigel Cunningham
2004-11-24 12:57 ` Suspend 2 merge: 3/51: e820 table support Nigel Cunningham
2004-11-25 16:53 ` Pavel Machek
2004-11-24 12:57 ` Suspend 2 merge: 4/51: Get module list Nigel Cunningham
2004-11-25 16:56 ` Pavel Machek
2004-11-25 21:25 ` Nigel Cunningham
2004-11-25 21:32 ` Pavel Machek
2004-11-24 12:57 ` Suspend 2 merge: 5/51: Workthread freezer support Nigel Cunningham
2004-11-25 16:57 ` Pavel Machek
2004-11-24 12:57 ` Suspend 2 merge: 7/51: Reboot handler hook Nigel Cunningham
2004-11-24 13:07 ` Christoph Hellwig
2004-11-24 20:19 ` Nigel Cunningham
2004-11-25 2:37 ` Nigel Cunningham
2004-11-24 12:57 ` Suspend 2 merge: 8/51: /proc/acpi/sleep hook Nigel Cunningham
2004-11-24 13:13 ` Christoph Hellwig
2004-11-24 12:57 ` Suspend 2 merge: 9/51: init/* changes Nigel Cunningham
2004-11-25 17:07 ` Pavel Machek
2004-11-25 21:36 ` Nigel Cunningham
2004-11-25 21:45 ` Pavel Machek
2004-11-25 21:51 ` Nigel Cunningham
2004-11-25 21:58 ` Pavel Machek
2004-11-25 22:03 ` Nigel Cunningham
2004-11-25 22:30 ` Pavel Machek
2004-11-27 2:14 ` Matthew Garrett
2004-11-27 7:22 ` Pavel Machek
2004-11-27 9:31 ` Herbert Xu
2004-11-27 13:21 ` Matthew Garrett
2004-11-27 16:20 ` Pavel Machek
2004-11-28 22:43 ` Nigel Cunningham
2004-11-24 12:57 ` Suspend 2 merge: 10/51: Exports for suspend built as modules Nigel Cunningham
2004-11-24 13:12 ` Christoph Hellwig
2004-11-24 21:52 ` Nigel Cunningham
2004-11-24 14:44 ` Ingo Molnar
2004-11-24 20:46 ` Nigel Cunningham
2004-11-25 18:07 ` Pavel Machek
2004-11-25 21:40 ` Nigel Cunningham
2004-11-25 21:50 ` Pavel Machek
2004-11-24 12:57 ` Suspend 2 merge: 11/51: Export vt functions Nigel Cunningham
2004-11-24 12:57 ` Suspend 2 merge:L 12/51: Disable OOM killer when suspending Nigel Cunningham
2004-11-25 18:12 ` Pavel Machek
2004-11-25 21:47 ` Nigel Cunningham
2004-11-25 21:54 ` Pavel Machek
2004-11-24 12:57 ` Suspend 2 merge: 13/51: Disable highmem tlb flush for copyback Nigel Cunningham
2004-11-25 18:13 ` Pavel Machek
2004-11-24 12:57 ` Suspend 2 merge: 14/51: Disable page alloc failure message when suspending Nigel Cunningham
2004-11-24 14:15 ` Christoph Hellwig
2004-11-24 20:46 ` Nigel Cunningham
2004-11-24 16:00 ` Dave Hansen
2004-11-24 21:06 ` Nigel Cunningham
2004-11-24 22:25 ` Dave Hansen
2004-11-25 18:15 ` Pavel Machek
2004-11-25 21:49 ` Nigel Cunningham
2004-11-25 21:56 ` Pavel Machek
2004-11-25 22:46 ` Nigel Cunningham
2004-11-25 23:22 ` Pavel Machek
2004-11-24 12:58 ` Suspend 2 merge: 15/51: Disable pdflush during suspend Nigel Cunningham
2004-11-24 12:58 ` Suspend 2 merge: 16/51: Disable cache reaping " Nigel Cunningham
2004-11-25 18:18 ` Pavel Machek
2004-11-25 22:00 ` Nigel Cunningham
2004-11-24 12:58 ` Suspend 2 merge: 17/51: Disable MCE checking " Nigel Cunningham
2004-11-25 18:19 ` Pavel Machek
2004-11-25 22:05 ` Nigel Cunningham
2004-11-25 22:31 ` Pavel Machek
2004-11-25 22:38 ` Nigel Cunningham
2004-11-25 22:45 ` Pavel Machek
2004-11-24 12:58 ` Suspend 2 merge: 18/51: Debug page_alloc support Nigel Cunningham
2004-11-24 16:02 ` Dave Hansen
2004-11-24 20:17 ` Nigel Cunningham
2004-11-24 22:26 ` Dave Hansen
2004-11-25 18:21 ` Pavel Machek
2004-11-25 22:06 ` Nigel Cunningham
2004-11-24 12:58 ` Suspend 2 merge: 19/51: Remove MTRR sysdev support Nigel Cunningham
2004-11-24 16:27 ` Zwane Mwaikambo
2004-11-24 20:17 ` Nigel Cunningham
2004-11-25 18:22 ` Pavel Machek
2004-11-28 22:34 ` Nigel Cunningham
2004-11-24 12:58 ` Suspend 2 merge: 20/51: Timer freezer (experimental) Nigel Cunningham
2004-11-24 12:58 ` Suspend 2 merge: 21/51: Refrigerator upgrade Nigel Cunningham
2004-11-25 18:33 ` Pavel Machek
2004-11-25 22:10 ` Nigel Cunningham
2004-11-25 22:36 ` Pavel Machek
2004-11-25 22:49 ` Nigel Cunningham
2004-11-25 23:25 ` Pavel Machek
2004-11-25 23:49 ` Nigel Cunningham
2004-11-26 0:05 ` Pavel Machek
2004-11-26 0:12 ` Nigel Cunningham
2004-11-26 0:18 ` Pavel Machek
2004-11-27 17:18 ` Pavel Machek
2004-11-26 21:00 ` Christoph Hellwig
2004-11-24 12:58 ` Suspend 2 merge: 22/51: Suspend2 lowlevel code Nigel Cunningham
2004-11-24 16:42 ` Zwane Mwaikambo
2004-11-24 21:20 ` Nigel Cunningham
2004-11-24 21:55 ` Zwane Mwaikambo
2004-11-24 21:56 ` Nigel Cunningham
2004-11-25 18:39 ` Pavel Machek
2004-11-25 22:15 ` Nigel Cunningham
2004-11-25 22:38 ` Pavel Machek
2004-11-24 12:58 ` Suspend 2 merge: 23/51: PPC support Nigel Cunningham
2004-11-25 18:40 ` Pavel Machek
2004-11-25 22:15 ` Nigel Cunningham
2004-11-24 12:59 ` Suspend 2 merge: 24/51: Keyboard and serial console hooks Nigel Cunningham
2004-11-24 13:29 ` Christoph Hellwig
2004-11-24 18:47 ` Yaroslav Rastrigin
2004-11-24 21:38 ` Nigel Cunningham
2004-11-24 21:57 ` Jan Rychter
2004-11-24 23:02 ` Christoph Hellwig
2004-11-25 1:22 ` Jan Rychter
2004-11-25 10:08 ` Christoph Hellwig
2004-11-26 20:21 ` pb
2004-11-25 19:28 ` Pavel Machek
2004-11-28 22:34 ` Nigel Cunningham
2004-11-28 23:39 ` Pavel Machek
2004-11-29 22:15 ` Nigel Cunningham
2004-11-24 12:59 ` Suspend 2 merge: 25/51: Documentation Nigel Cunningham
2004-11-24 12:59 ` Suspend 2 merge: 26/51: Kconfig and makefile Nigel Cunningham
2004-11-24 16:34 ` Roman Zippel
2004-11-24 21:11 ` Nigel Cunningham
2004-11-24 21:46 ` Roman Zippel
2004-11-24 21:53 ` Nigel Cunningham
2004-11-25 2:37 ` Nigel Cunningham
2004-11-24 12:59 ` Suspend 2 merge: 27/51: Block I/O module Nigel Cunningham
2004-11-24 12:59 ` Suspend 2 merge: 28/51: Suspend memory pool hooks Nigel Cunningham
2004-11-25 19:34 ` Pavel Machek
2004-11-24 12:59 ` Suspend 2 merge: 29/51: Clear swapfile bdev in swapoff Nigel Cunningham
2004-11-24 12:59 ` Suspend 2 merge: 30/51: Enable slab alloc fallback to suspend memory pool Nigel Cunningham
2004-11-25 19:36 ` Pavel Machek
2004-11-24 12:59 ` Suspend 2 merge: 31/51: Export tlb flushing Nigel Cunningham
2004-11-24 15:32 ` Martin J. Bligh
2004-11-24 21:04 ` Nigel Cunningham
2004-11-24 12:59 ` Suspend 2 merge: 32/51: Make show task non-static Nigel Cunningham
2004-11-24 12:59 ` Suspend 2 merge: 33/51: More documentation Nigel Cunningham
2004-11-24 13:00 ` Suspend 2 merge: 34/51: Includes Nigel Cunningham
2004-11-24 13:25 ` Christoph Hellwig
2004-11-24 20:17 ` Nigel Cunningham
2004-11-24 23:19 ` Matthew Garrett
2004-11-25 2:43 ` Nigel Cunningham
2004-11-24 13:00 ` Suspend 2 merge: 35/51: Code always built in to the kernel Nigel Cunningham
2004-11-25 23:32 ` Pavel Machek
2004-11-25 23:57 ` Nigel Cunningham
2004-11-26 0:08 ` Pavel Machek
2004-11-26 0:17 ` Nigel Cunningham
2004-11-26 0:23 ` Pavel Machek
2004-11-27 2:19 ` Matthew Garrett
2004-11-28 22:39 ` Nigel Cunningham
2004-11-27 9:00 ` Jan Rychter
2004-11-27 17:22 ` Pavel Machek
2004-11-24 13:00 ` Suspend 2 merge: 36/51: Highlevel I/O routines Nigel Cunningham
2004-11-25 23:36 ` Pavel Machek
2004-11-27 1:39 ` Tomas Carnecky
2004-11-24 13:00 ` Suspend 2 merge: 37/51: Memory pool support Nigel Cunningham
2004-11-25 23:37 ` Pavel Machek
2004-11-24 13:00 ` Suspend 2 merge: 38/51: Page directory support Nigel Cunningham
2004-11-24 13:01 ` Suspend 2 merge: 39/51: Plugins support Nigel Cunningham
2004-11-24 13:01 ` Suspend 2 merge: 40/51: Prepare image Nigel Cunningham
2004-11-24 13:01 ` Suspend 2 merge: 41/51: Ranges (extents) Nigel Cunningham
2004-11-24 13:01 ` Suspend 2 merge: 42/51: Suspend.c Nigel Cunningham
2004-11-24 16:52 ` Zwane Mwaikambo
2004-11-24 21:23 ` Nigel Cunningham
2004-11-25 23:43 ` Pavel Machek
2004-11-24 13:01 ` Suspend 2 merge: 43/51: Utility functions Nigel Cunningham
2004-11-25 23:46 ` Pavel Machek
2004-11-26 0:04 ` Nigel Cunningham
2004-11-27 16:11 ` Dave Hansen [this message]
2004-11-28 21:36 ` Nigel Cunningham
2004-11-24 13:01 ` Suspend 2 merge: 44/51: Text UI plugin Nigel Cunningham
2004-11-24 13:02 ` Suspend 2 merge: 45/51: Bootsplash support Nigel Cunningham
2004-11-24 13:02 ` Suspend 2 merge: 46/51: LZF support Nigel Cunningham
2004-11-24 23:01 ` Bartlomiej Zolnierkiewicz
2004-11-25 2:38 ` Nigel Cunningham
2004-11-25 6:32 ` hugang
2004-11-25 6:52 ` Dmitry Torokhov
2004-11-25 7:07 ` hugang
2004-11-25 10:10 ` Christoph Hellwig
2004-11-24 13:02 ` Suspend 2 merge: 47/51: GZIP support Nigel Cunningham
2004-11-25 23:50 ` Pavel Machek
2004-11-24 13:02 ` Suspend 2 merge: 48/51: Swapwriter Nigel Cunningham
2004-11-25 23:55 ` Pavel Machek
2004-11-26 0:05 ` Nigel Cunningham
2004-11-24 13:02 ` Suspend 2 merge: 49/51: Checksumming Nigel Cunningham
2004-11-25 23:56 ` Pavel Machek
2004-11-26 0:00 ` Nigel Cunningham
2004-11-26 0:14 ` Pavel Machek
2004-11-29 9:55 ` Rob Landley
2004-11-30 0:24 ` Nigel Cunningham
2004-11-29 23:30 ` Rob Landley
2004-11-30 0:49 ` Nigel Cunningham
2004-11-30 13:07 ` Pavel Machek
2004-11-30 21:45 ` Nigel Cunningham
2004-11-30 13:02 ` Pavel Machek
2004-11-30 13:38 ` Matthew Garrett
2004-11-30 22:38 ` Pavel Machek
2004-12-02 21:31 ` Rob Landley
2004-11-24 13:02 ` Suspend 2 merge: 50/51: Device mapper support Nigel Cunningham
2004-11-25 23:58 ` Pavel Machek
2004-11-26 0:07 ` Nigel Cunningham
2004-12-02 20:40 ` Alasdair G Kergon
2004-12-02 21:04 ` Nigel Cunningham
2004-12-02 21:49 ` Alasdair G Kergon
2004-12-02 22:08 ` Nigel Cunningham
2004-12-03 17:47 ` Alasdair G Kergon
2004-12-03 19:57 ` Nigel Cunningham
2004-12-03 20:12 ` Alasdair G Kergon
2004-12-14 0:47 ` Nigel Cunningham
2004-11-24 13:03 ` Suspend 2 merge: 51/51: Notes Nigel Cunningham
2004-11-26 0:01 ` Pavel Machek
2004-11-26 0:09 ` Nigel Cunningham
2004-11-26 0:24 ` Pavel Machek
2004-11-24 13:03 ` Suspend 2 merge: 6/51 Nigel Cunningham
2004-11-24 13:28 ` Suspend 2 merge Christoph Hellwig
2004-11-24 20:46 ` Nigel Cunningham
2004-11-25 19:20 ` Pavel Machek
2004-11-25 22:34 ` Nigel Cunningham
2004-11-25 23:22 ` Pavel Machek
2004-11-25 23:46 ` Nigel Cunningham
2004-11-26 0:39 ` Pavel Machek
2004-11-26 9:08 ` Nigel Cunningham
2004-11-26 12:38 ` Pavel Machek
2004-11-26 15:54 ` Christoph Hellwig
2004-11-26 22:36 ` Pavel Machek
2004-11-28 22:35 ` Nigel Cunningham
2004-11-28 23:55 ` Pavel Machek
2004-11-29 3:20 ` Nigel Cunningham
2004-11-29 13:03 ` Pavel Machek
2004-11-30 0:24 ` Nigel Cunningham
2004-11-30 10:19 ` Pavel Machek
[not found] ` <20041126082109.GA842@hugang.soulinfo.com>
2004-11-26 13:25 ` Pavel Machek
[not found] ` <20041126043203.GA2713@hugang.soulinfo.com>
2004-11-26 9:08 ` Nigel Cunningham
2004-11-26 13:37 ` Pavel Machek
2004-11-26 13:31 ` Pavel Machek
2004-11-28 21:40 ` Nigel Cunningham
2004-11-29 9:34 ` Stefan Seyfried
2004-11-29 22:20 ` Nigel Cunningham
2004-11-29 22:34 ` Pavel Machek
2004-11-30 12:16 ` Stefan Seyfried
2004-11-30 21:16 ` Nigel Cunningham
2004-11-30 22:20 ` Pavel Machek
2004-12-01 9:27 ` Nigel Cunningham
2004-12-01 10:08 ` Pavel Machek
2004-12-01 20:39 ` Nigel Cunningham
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