From: "Chris Friesen" <cfriesen@nortel.com>
To: Aucoin@Houston.RR.com
Cc: "'Kyle Moffett'" <mrmacman_g4@mac.com>,
"'Tim Schmielau'" <tim@physik3.uni-rostock.de>,
"'Andrew Morton'" <akpm@osdl.org>,
torvalds@osdl.org, linux-kernel@vger.kernel.org,
clameter@sgi.com
Subject: Re: la la la la ... swappiness
Date: Mon, 04 Dec 2006 10:10:39 -0600 [thread overview]
Message-ID: <4574487F.7040805@nortel.com> (raw)
In-Reply-To: <200612041439.kB4EdGFn025092@ms-smtp-03.texas.rr.com>
Aucoin wrote:
> The definition of perfectly good here may be up for debate or
> someone can explain it to me. This perfectly good data was
> cached under the tar yet hours after the tar has completed the
> pages are still cached.
If nothing else has asked for that memory since the tar, there is no
reason to evict the pages from the cache. The inactive memory is
basically "free, but still contains the previous data".
If anything asks for memory, those pages will be filled with zeros or
the new information. In the meantime, the kernel keeps them in the
cache in case anyone wants the old information.
It doesn't hurt anything to keep the pages around with the old data in
them--and it might help.
Chris
next prev parent reply other threads:[~2006-12-04 16:11 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-04 1:54 la la la la ... swappiness Aucoin
2006-12-04 4:59 ` Andrew Morton
2006-12-04 7:22 ` Kyle Moffett
2006-12-04 14:39 ` Aucoin
2006-12-04 16:10 ` Chris Friesen [this message]
2006-12-04 17:07 ` Horst H. von Brand
2006-12-04 17:49 ` Aucoin
2006-12-04 18:44 ` Tim Schmielau
2006-12-04 21:28 ` Aucoin
2006-12-04 18:46 ` Horst H. von Brand
2006-12-04 21:43 ` Aucoin
2006-12-04 18:06 ` Andrew Morton
2006-12-04 18:15 ` Christoph Lameter
2006-12-04 18:38 ` Jeffrey Hundstad
2006-12-04 21:25 ` Aucoin
2006-12-04 21:43 ` Andrew Morton
2006-12-04 15:55 ` David Lang
2006-12-04 17:42 ` Aucoin
-- strict thread matches above, loose matches on Subject: below --
2006-12-04 19:02 Al Boldi
[not found] <200612030616.kB36GYBs019873@ms-smtp-03.texas.rr.com>
2006-12-03 8:08 ` Andrew Morton
2006-12-03 15:40 ` Aucoin
2006-12-03 20:46 ` Tim Schmielau
2006-12-03 23:56 ` Aucoin
2006-12-04 0:57 ` Horst H. von Brand
2006-12-04 4:56 ` Andrew Morton
2006-12-04 5:13 ` Linus Torvalds
2006-12-04 17:03 ` Christoph Lameter
2006-12-04 10:43 ` Nick Piggin
2006-12-04 14:45 ` Aucoin
2006-12-04 15:04 ` Nick Piggin
2006-12-05 4:02 ` Aucoin
2006-12-05 4:46 ` Linus Torvalds
2006-12-05 6:41 ` Aucoin
2006-12-05 7:01 ` Nick Piggin
2006-12-05 7:26 ` Rene Herman
2006-12-05 13:27 ` Aucoin
2006-12-05 13:49 ` Rene Herman
2006-12-05 13:25 ` Aucoin
2006-12-03 6:18 Aucoin
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