From: Nick Piggin <piggin@cyberone.com.au>
To: Andrew Morton <akpm@osdl.org>
Cc: m.c.p@wolk-project.de, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, mfedyk@matchmail.com, plate@gmx.tm
Subject: Re: [PATCH] 2.6.4-rc2-mm1: vm-split-active-lists
Date: Fri, 12 Mar 2004 20:37:59 +1100 [thread overview]
Message-ID: <405184F7.1050100@cyberone.com.au> (raw)
In-Reply-To: <20040312012703.69f2bb9b.akpm@osdl.org>
Andrew Morton wrote:
>Nick Piggin <piggin@cyberone.com.au> wrote:
>
>>Hmm... I guess it is still smooth because it is swapping out only
>> inactive pages. If the standard VM isn't being pushed very hard it
>> doesn't scan mapped pages at all which is why it isn't swapping.
>>
>> I have a preference for allowing it to scan some mapped pages though.
>>
>
>I haven't looked at the code but if, as I assume, it is always scanning
>mapped pages, although at a reduced rate then the effect will be the same
>as setting swappiness to 100, except it will take longer.
>
>
Yep
>That effect is to cause the whole world to be swapped out when people
>return to their machines in the morning. Once they're swapped back in the
>first thing they do it send bitchy emails to you know who.
>
>>From a performance perspective it's the right thing to do, but nobody likes
>it.
>
>
Yeah. I wonder if there is a way to be smarter about dropping these
used once pages without putting pressure on more permanent pages...
I guess all heuristics will fall down somewhere or other.
WARNING: multiple messages have this Message-ID (diff)
From: Nick Piggin <piggin@cyberone.com.au>
To: Andrew Morton <akpm@osdl.org>
Cc: m.c.p@wolk-project.de, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, mfedyk@matchmail.com, plate@gmx.tm
Subject: Re: [PATCH] 2.6.4-rc2-mm1: vm-split-active-lists
Date: Fri, 12 Mar 2004 20:37:59 +1100 [thread overview]
Message-ID: <405184F7.1050100@cyberone.com.au> (raw)
In-Reply-To: <20040312012703.69f2bb9b.akpm@osdl.org>
Andrew Morton wrote:
>Nick Piggin <piggin@cyberone.com.au> wrote:
>
>>Hmm... I guess it is still smooth because it is swapping out only
>> inactive pages. If the standard VM isn't being pushed very hard it
>> doesn't scan mapped pages at all which is why it isn't swapping.
>>
>> I have a preference for allowing it to scan some mapped pages though.
>>
>
>I haven't looked at the code but if, as I assume, it is always scanning
>mapped pages, although at a reduced rate then the effect will be the same
>as setting swappiness to 100, except it will take longer.
>
>
Yep
>That effect is to cause the whole world to be swapped out when people
>return to their machines in the morning. Once they're swapped back in the
>first thing they do it send bitchy emails to you know who.
>
>>From a performance perspective it's the right thing to do, but nobody likes
>it.
>
>
Yeah. I wonder if there is a way to be smarter about dropping these
used once pages without putting pressure on more permanent pages...
I guess all heuristics will fall down somewhere or other.
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next prev parent reply other threads:[~2004-03-12 9:38 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-11 0:04 [PATCH] 2.6.4-rc2-mm1: vm-split-active-lists Nick Piggin
2004-03-11 17:25 ` Marc-Christian Petersen
2004-03-11 17:25 ` Marc-Christian Petersen
2004-03-12 9:09 ` Nick Piggin
2004-03-12 9:09 ` Nick Piggin
2004-03-12 9:27 ` Andrew Morton
2004-03-12 9:27 ` Andrew Morton
2004-03-12 9:37 ` Nick Piggin [this message]
2004-03-12 9:37 ` Nick Piggin
2004-03-12 11:08 ` Matthias Urlichs
2004-03-12 11:47 ` Jamie Lokier
2004-03-12 12:44 ` Nick Piggin
2004-03-12 14:15 ` Nick Piggin
2004-03-12 15:05 ` Nikita Danilov
2004-03-12 15:28 ` Nick Piggin
2004-03-12 16:31 ` Nikita Danilov
2004-03-12 23:05 ` Nick Piggin
2004-03-12 19:12 ` Andrew Morton
2004-03-12 23:23 ` Nick Piggin
2004-03-12 19:12 ` Bill Davidsen
2004-03-12 23:50 ` Nick Piggin
2004-03-12 21:46 ` Pavel Machek
-- strict thread matches above, loose matches on Subject: below --
2004-03-12 14:18 Mark_H_Johnson
2004-03-12 14:18 ` Mark_H_Johnson
2004-03-12 14:27 ` Nick Piggin
2004-03-12 14:27 ` Nick Piggin
2004-03-12 19:46 ` Jamie Lokier
2004-03-12 19:46 ` Jamie Lokier
2004-03-12 15:00 Mark_H_Johnson
2004-03-12 15:00 ` Mark_H_Johnson
2004-03-12 15:13 ` Nick Piggin
2004-03-12 15:13 ` Nick Piggin
2004-03-12 19:35 ` Jamie Lokier
2004-03-12 19:35 ` Jamie Lokier
2004-03-12 21:17 ` Mike Fedyk
2004-03-12 21:17 ` Mike Fedyk
2004-03-12 22:21 ` Jamie Lokier
2004-03-12 22:21 ` Jamie Lokier
2004-03-12 22:36 ` Mike Fedyk
2004-03-12 22:36 ` Mike Fedyk
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