From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Diego Calleja <diegocg@teleline.es>,
Rik van Riel <riel@redhat.com>,
raybry@sgi.com, marcelo.tosatti@cyclades.com, kernel@kolivas.org,
akpm@osdl.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, piggin@cyberone.com.au
Subject: Re: swapping and the value of /proc/sys/vm/swappiness
Date: Wed, 08 Sep 2004 16:42:14 -0700 [thread overview]
Message-ID: <64810000.1094686934@flay> (raw)
In-Reply-To: <1094682510.12371.25.camel@localhost.localdomain>
> On Mer, 2004-09-08 at 22:10, Martin J. Bligh wrote:
>> I really don't see any point in pushing the self-tuning of the kernel out
>> into userspace. What are you hoping to achieve?
>
> What if there is more than one right answer to "self-tune" policy. Also
> what if you want an application to tweak the tuning in ways that are
> different to general policy ?
It's still overridable from userspace, I'd think. But having a sensible
default in the kernel makes a crapload of sense to me. We have better
faster access to data from there - if there are really things that aren't
just parameters to the tuning algorithm it'd have to repeatedly poke
values into hard overrides. Do-able, but not what we want by default,
I'd think.
M.
WARNING: multiple messages have this Message-ID (diff)
From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Diego Calleja <diegocg@teleline.es>,
Rik van Riel <riel@redhat.com>,
raybry@sgi.com, marcelo.tosatti@cyclades.com, kernel@kolivas.org,
akpm@osdl.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, piggin@cyberone.com.au
Subject: Re: swapping and the value of /proc/sys/vm/swappiness
Date: Wed, 08 Sep 2004 16:42:14 -0700 [thread overview]
Message-ID: <64810000.1094686934@flay> (raw)
In-Reply-To: <1094682510.12371.25.camel@localhost.localdomain>
> On Mer, 2004-09-08 at 22:10, Martin J. Bligh wrote:
>> I really don't see any point in pushing the self-tuning of the kernel out
>> into userspace. What are you hoping to achieve?
>
> What if there is more than one right answer to "self-tune" policy. Also
> what if you want an application to tweak the tuning in ways that are
> different to general policy ?
It's still overridable from userspace, I'd think. But having a sensible
default in the kernel makes a crapload of sense to me. We have better
faster access to data from there - if there are really things that aren't
just parameters to the tuning algorithm it'd have to repeatedly poke
values into hard overrides. Do-able, but not what we want by default,
I'd think.
M.
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next prev parent reply other threads:[~2004-09-08 23:43 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-06 19:11 swapping and the value of /proc/sys/vm/swappiness Ray Bryant
2004-09-06 20:10 ` Andrew Morton
2004-09-06 20:10 ` Andrew Morton
2004-09-06 21:22 ` Ray Bryant
2004-09-06 21:22 ` Ray Bryant
2004-09-06 21:36 ` Andrew Morton
2004-09-06 21:36 ` Andrew Morton
2004-09-06 22:37 ` William Lee Irwin III
2004-09-06 22:37 ` William Lee Irwin III
2004-09-06 23:51 ` Nick Piggin
2004-09-06 23:51 ` Nick Piggin
2004-09-07 0:31 ` Ray Bryant
2004-09-07 0:31 ` Ray Bryant
2004-09-06 22:48 ` William Lee Irwin III
2004-09-06 22:48 ` William Lee Irwin III
2004-09-06 23:09 ` Con Kolivas
2004-09-06 23:09 ` Con Kolivas
2004-09-06 23:27 ` Andrew Morton
2004-09-06 23:27 ` Andrew Morton
2004-09-06 23:34 ` Con Kolivas
2004-09-06 23:34 ` Con Kolivas
2004-09-07 0:03 ` Marcelo Tosatti
2004-09-07 0:03 ` Marcelo Tosatti
2004-09-07 1:34 ` Con Kolivas
2004-09-07 1:34 ` Con Kolivas
2004-09-07 10:38 ` Nick Piggin
2004-09-07 10:38 ` Nick Piggin
2004-09-07 10:56 ` Con Kolivas
2004-09-08 16:45 ` Marcelo Tosatti
2004-09-08 16:45 ` Marcelo Tosatti
2004-09-09 1:12 ` Con Kolivas
2004-09-07 17:03 ` Ray Bryant
2004-09-07 17:03 ` Ray Bryant
2004-09-07 21:20 ` Marcelo Tosatti
2004-09-07 21:20 ` Marcelo Tosatti
2004-09-08 2:18 ` Marcelo Tosatti
2004-09-08 2:18 ` Marcelo Tosatti
2004-09-08 14:20 ` Ray Bryant
2004-09-08 16:54 ` Marcelo Tosatti
2004-09-08 16:54 ` Marcelo Tosatti
2004-09-08 19:35 ` Ray Bryant
2004-09-08 19:35 ` Ray Bryant
2004-09-08 19:30 ` Marcelo Tosatti
2004-09-08 19:30 ` Marcelo Tosatti
2004-09-09 3:06 ` Ray Bryant
2004-09-09 3:06 ` Ray Bryant
2004-09-09 2:14 ` Marcelo Tosatti
2004-09-09 2:14 ` Marcelo Tosatti
2004-09-09 14:21 ` Ray Bryant
2004-09-09 14:21 ` Ray Bryant
2004-09-09 3:09 ` William Lee Irwin III
2004-09-09 3:09 ` William Lee Irwin III
2004-09-09 14:16 ` Ray Bryant
2004-09-09 17:23 ` William Lee Irwin III
2004-09-09 17:23 ` William Lee Irwin III
2004-09-28 1:54 ` Ray Bryant
2004-09-28 3:36 ` Nick Piggin
2004-09-28 3:36 ` Nick Piggin
2004-09-29 0:36 ` Nick Piggin
2004-09-29 4:23 ` Ray Bryant
2004-09-29 4:23 ` Ray Bryant
2004-09-30 17:15 ` Ray Bryant
2004-09-30 17:15 ` Ray Bryant
2004-09-08 17:31 ` Martin J. Bligh
2004-09-08 17:31 ` Martin J. Bligh
2004-09-08 18:04 ` Rik van Riel
2004-09-08 18:04 ` Rik van Riel
2004-09-08 19:50 ` Diego Calleja
2004-09-08 19:50 ` Diego Calleja
2004-09-08 21:10 ` Martin J. Bligh
2004-09-08 21:10 ` Martin J. Bligh
2004-09-08 21:55 ` Diego Calleja
2004-09-08 21:55 ` Diego Calleja
2004-09-08 22:20 ` Martin J. Bligh
2004-09-08 22:20 ` Martin J. Bligh
2004-09-08 23:22 ` Rik van Riel
2004-09-08 23:22 ` Rik van Riel
2004-09-09 16:26 ` Bill Davidsen
2004-09-08 22:28 ` Alan Cox
2004-09-08 22:28 ` Alan Cox
2004-09-08 23:42 ` Martin J. Bligh [this message]
2004-09-08 23:42 ` Martin J. Bligh
2004-09-08 19:54 ` Ray Bryant
2004-09-08 19:54 ` Ray Bryant
2004-09-08 15:19 ` Ray Bryant
2004-09-08 15:19 ` Ray Bryant
2004-09-14 18:31 ` Florin Andrei
2004-09-14 20:15 ` Marcelo Tosatti
2004-09-14 22:53 ` Con Kolivas
2004-09-14 21:41 ` Marcelo Tosatti
2004-09-15 0:22 ` Con Kolivas
2004-09-16 18:50 ` Marcelo Tosatti
2004-09-17 0:22 ` Con Kolivas
2004-09-15 16:54 ` Florin Andrei
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