From: Avi Kivity <avi@redhat.com>
To: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
jeremy@goop.org, hugh.dickins@tiscali.co.uk, ngupta@vflare.org,
JBeulich@novell.com, chris.mason@oracle.com,
kurt.hackel@oracle.com, dave.mccracken@oracle.com,
npiggin@suse.de, akpm@linux-foundation.org, riel@redhat.com
Subject: Re: Frontswap [PATCH 0/4] (was Transcendent Memory): overview
Date: Sat, 24 Apr 2010 21:25:02 +0300 [thread overview]
Message-ID: <4BD3377E.6010303@redhat.com> (raw)
In-Reply-To: <5fa93086-b0d7-4603-bdeb-1d6bfca0cd08@default>
On 04/23/2010 07:26 PM, Dan Magenheimer wrote:
>>
>> Looks like "init" == open, "put_page" == write, "get_page" == read,
>> "flush_page|flush_area" == trim. The only difference seems to be that
>> an overwriting put_page may fail. Doesn't seem to be much of a win,
>>
> No, ANY put_page can fail, and this is a critical part of the API
> that provides all of the flexibility for the hypervisor and all
> the guests. (See previous reply.)
>
The guest isn't required to do any put_page()s. It can issue lots of
them when memory is available, and keep them in the hypervisor forever.
Failing new put_page()s isn't enough for a dynamic system, you need to
be able to force the guest to give up some of its tmem.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
jeremy@goop.org, hugh.dickins@tiscali.co.uk, ngupta@vflare.org,
JBeulich@novell.com, chris.mason@oracle.com,
kurt.hackel@oracle.com, dave.mccracken@oracle.com,
npiggin@suse.de, akpm@linux-foundation.org, riel@redhat.com
Subject: Re: Frontswap [PATCH 0/4] (was Transcendent Memory): overview
Date: Sat, 24 Apr 2010 21:25:02 +0300 [thread overview]
Message-ID: <4BD3377E.6010303@redhat.com> (raw)
In-Reply-To: <5fa93086-b0d7-4603-bdeb-1d6bfca0cd08@default>
On 04/23/2010 07:26 PM, Dan Magenheimer wrote:
>>
>> Looks like "init" == open, "put_page" == write, "get_page" == read,
>> "flush_page|flush_area" == trim. The only difference seems to be that
>> an overwriting put_page may fail. Doesn't seem to be much of a win,
>>
> No, ANY put_page can fail, and this is a critical part of the API
> that provides all of the flexibility for the hypervisor and all
> the guests. (See previous reply.)
>
The guest isn't required to do any put_page()s. It can issue lots of
them when memory is available, and keep them in the hypervisor forever.
Failing new put_page()s isn't enough for a dynamic system, you need to
be able to force the guest to give up some of its tmem.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2010-04-24 18:25 UTC|newest]
Thread overview: 163+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-22 13:42 Frontswap [PATCH 0/4] (was Transcendent Memory): overview Dan Magenheimer
2010-04-22 13:42 ` Dan Magenheimer
2010-04-22 15:28 ` Avi Kivity
2010-04-22 15:28 ` Avi Kivity
2010-04-22 15:48 ` Dan Magenheimer
2010-04-22 15:48 ` Dan Magenheimer
2010-04-22 16:13 ` Avi Kivity
2010-04-22 16:13 ` Avi Kivity
2010-04-22 20:15 ` Dan Magenheimer
2010-04-22 20:15 ` Dan Magenheimer
2010-04-23 9:48 ` Avi Kivity
2010-04-23 9:48 ` Avi Kivity
2010-04-23 13:47 ` Dan Magenheimer
2010-04-23 13:47 ` Dan Magenheimer
2010-04-23 13:57 ` Avi Kivity
2010-04-23 13:57 ` Avi Kivity
2010-04-23 14:43 ` Dan Magenheimer
2010-04-23 14:43 ` Dan Magenheimer
2010-04-23 14:52 ` Avi Kivity
2010-04-23 14:52 ` Avi Kivity
2010-04-23 15:00 ` Avi Kivity
2010-04-23 15:00 ` Avi Kivity
2010-04-23 16:26 ` Dan Magenheimer
2010-04-23 16:26 ` Dan Magenheimer
2010-04-24 18:25 ` Avi Kivity [this message]
2010-04-24 18:25 ` Avi Kivity
[not found] ` <1c02a94a-a6aa-4cbb-a2e6-9d4647760e91@default4BD43033.7090706@redhat.com>
2010-04-25 0:41 ` Dan Magenheimer
2010-04-25 0:41 ` Dan Magenheimer
2010-04-25 12:06 ` Avi Kivity
2010-04-25 12:06 ` Avi Kivity
2010-04-25 13:12 ` Dan Magenheimer
2010-04-25 13:12 ` Dan Magenheimer
2010-04-25 13:18 ` Avi Kivity
2010-04-25 13:18 ` Avi Kivity
2010-04-28 5:55 ` Pavel Machek
2010-04-28 5:55 ` Pavel Machek
2010-04-29 14:42 ` Dan Magenheimer
2010-04-29 14:42 ` Dan Magenheimer
2010-04-29 18:59 ` Avi Kivity
2010-04-29 18:59 ` Avi Kivity
2010-04-29 19:01 ` Avi Kivity
2010-04-29 19:01 ` Avi Kivity
2010-04-29 18:53 ` Avi Kivity
2010-04-29 18:53 ` Avi Kivity
2010-04-30 1:45 ` Dave Hansen
2010-04-30 1:45 ` Dave Hansen
2010-04-30 7:13 ` Avi Kivity
2010-04-30 7:13 ` Avi Kivity
2010-04-30 15:59 ` Dan Magenheimer
2010-04-30 15:59 ` Dan Magenheimer
2010-04-30 16:08 ` Dave Hansen
2010-04-30 16:08 ` Dave Hansen
2010-05-10 16:05 ` Martin Schwidefsky
2010-05-10 16:05 ` Martin Schwidefsky
2010-04-30 16:16 ` Avi Kivity
2010-04-30 16:16 ` Avi Kivity
[not found] ` <4BDB18CE.2090608@goop.org4BDB2069.4000507@redhat.com>
[not found] ` <3a62a058-7976-48d7-acd2-8c6a8312f10f@default20100502071059.GF1790@ucw.cz>
2010-04-30 16:43 ` Dan Magenheimer
2010-04-30 16:43 ` Dan Magenheimer
2010-04-30 17:10 ` Dave Hansen
2010-04-30 17:10 ` Dave Hansen
2010-04-30 18:08 ` Avi Kivity
2010-04-30 18:08 ` Avi Kivity
2010-04-30 17:52 ` Jeremy Fitzhardinge
2010-04-30 17:52 ` Jeremy Fitzhardinge
2010-04-30 18:24 ` Avi Kivity
2010-04-30 18:24 ` Avi Kivity
2010-04-30 18:59 ` Jeremy Fitzhardinge
2010-04-30 18:59 ` Jeremy Fitzhardinge
2010-05-01 8:28 ` Avi Kivity
2010-05-01 8:28 ` Avi Kivity
2010-05-01 17:10 ` Dan Magenheimer
2010-05-01 17:10 ` Dan Magenheimer
2010-05-02 7:11 ` Pavel Machek
2010-05-02 7:11 ` Pavel Machek
2010-05-02 15:05 ` Dan Magenheimer
2010-05-02 15:05 ` Dan Magenheimer
2010-05-02 20:06 ` Pavel Machek
2010-05-02 20:06 ` Pavel Machek
2010-05-02 21:05 ` Dan Magenheimer
2010-05-02 21:05 ` Dan Magenheimer
2010-05-02 7:57 ` Nitin Gupta
2010-05-02 7:57 ` Nitin Gupta
2010-05-02 16:06 ` Dan Magenheimer
2010-05-02 16:06 ` Dan Magenheimer
2010-05-02 16:48 ` Avi Kivity
2010-05-02 16:48 ` Avi Kivity
2010-05-02 17:22 ` Dan Magenheimer
2010-05-02 17:22 ` Dan Magenheimer
2010-05-03 9:39 ` Avi Kivity
2010-05-03 9:39 ` Avi Kivity
2010-05-03 14:59 ` Dan Magenheimer
2010-05-03 14:59 ` Dan Magenheimer
2010-05-02 15:35 ` Avi Kivity
2010-05-02 15:35 ` Avi Kivity
2010-05-02 17:06 ` Dan Magenheimer
2010-05-02 17:06 ` Dan Magenheimer
2010-05-03 8:46 ` Avi Kivity
2010-05-03 8:46 ` Avi Kivity
2010-05-03 16:01 ` Dan Magenheimer
2010-05-03 16:01 ` Dan Magenheimer
2010-05-03 19:32 ` Pavel Machek
2010-05-03 19:32 ` Pavel Machek
2010-04-30 16:04 ` Dave Hansen
2010-04-30 16:04 ` Dave Hansen
2010-04-23 15:56 ` Dan Magenheimer
2010-04-23 15:56 ` Dan Magenheimer
2010-04-24 18:22 ` Avi Kivity
2010-04-24 18:22 ` Avi Kivity
2010-04-25 0:30 ` Dan Magenheimer
2010-04-25 0:30 ` Dan Magenheimer
2010-04-25 12:11 ` Avi Kivity
2010-04-25 12:11 ` Avi Kivity
[not found] ` <c5062f3a-3232-4b21-b032-2ee1f2485ff0@default4BD44E74.2020506@redhat.com>
2010-04-25 13:37 ` Dan Magenheimer
2010-04-25 13:37 ` Dan Magenheimer
2010-04-25 14:15 ` Avi Kivity
2010-04-25 14:15 ` Avi Kivity
2010-04-25 15:29 ` Dan Magenheimer
2010-04-25 15:29 ` Dan Magenheimer
2010-04-26 6:01 ` Avi Kivity
2010-04-26 6:01 ` Avi Kivity
2010-04-26 12:45 ` Dan Magenheimer
2010-04-26 12:45 ` Dan Magenheimer
2010-04-26 13:48 ` Avi Kivity
2010-04-26 13:48 ` Avi Kivity
2010-04-27 12:56 ` Pavel Machek
2010-04-27 12:56 ` Pavel Machek
2010-04-27 14:32 ` Dan Magenheimer
2010-04-27 14:32 ` Dan Magenheimer
2010-04-29 13:02 ` Pavel Machek
2010-04-29 13:02 ` Pavel Machek
2010-04-27 11:52 ` Valdis.Kletnieks
2010-04-27 0:49 ` Jeremy Fitzhardinge
2010-04-27 0:49 ` Jeremy Fitzhardinge
2010-04-27 12:55 ` Pavel Machek
2010-04-27 12:55 ` Pavel Machek
2010-04-27 14:43 ` Nitin Gupta
2010-04-27 14:43 ` Nitin Gupta
2010-04-29 13:04 ` Pavel Machek
2010-04-29 13:04 ` Pavel Machek
2010-04-24 1:49 ` Nitin Gupta
2010-04-24 1:49 ` Nitin Gupta
2010-04-24 18:27 ` Avi Kivity
2010-04-24 18:27 ` Avi Kivity
2010-04-25 3:11 ` Nitin Gupta
2010-04-25 3:11 ` Nitin Gupta
2010-04-25 12:16 ` Avi Kivity
2010-04-25 12:16 ` Avi Kivity
2010-04-25 16:05 ` Nitin Gupta
2010-04-25 16:05 ` Nitin Gupta
2010-04-26 6:06 ` Avi Kivity
2010-04-26 6:06 ` Avi Kivity
2010-04-26 12:50 ` Dan Magenheimer
2010-04-26 12:50 ` Dan Magenheimer
2010-04-26 13:43 ` Avi Kivity
2010-04-26 13:43 ` Avi Kivity
2010-04-27 8:29 ` Dan Magenheimer
2010-04-27 8:29 ` Dan Magenheimer
2010-04-27 9:21 ` Avi Kivity
2010-04-27 9:21 ` Avi Kivity
2010-04-26 13:47 ` Nitin Gupta
2010-04-26 13:47 ` Nitin Gupta
2010-04-23 16:35 ` Jiahua
2010-04-23 16:35 ` Jiahua
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4BD3377E.6010303@redhat.com \
--to=avi@redhat.com \
--cc=JBeulich@novell.com \
--cc=akpm@linux-foundation.org \
--cc=chris.mason@oracle.com \
--cc=dan.magenheimer@oracle.com \
--cc=dave.mccracken@oracle.com \
--cc=hugh.dickins@tiscali.co.uk \
--cc=jeremy@goop.org \
--cc=kurt.hackel@oracle.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=ngupta@vflare.org \
--cc=npiggin@suse.de \
--cc=riel@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.