From: Nick Piggin <piggin@cyberone.com.au>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: linux-mm@kvack.org, akpm@osdl.org, arjanv@redhat.com,
linux-kernel@vger.kernel.org
Subject: Re: [RFC] memory defragmentation to satisfy high order allocations
Date: Sat, 02 Oct 2004 12:30:01 +1000 [thread overview]
Message-ID: <415E12A9.7000507@cyberone.com.au> (raw)
In-Reply-To: <20041001182221.GA3191@logos.cnet>
Marcelo Tosatti wrote:
>
>With such a thing in place we can build a mechanism for kswapd
>(or a separate kernel thread, if needed) to notice when we are low on
>high order pages, and use the coalescing algorithm instead blindly
>freeing unique pages from LRU in the hope to build large physically
>contiguous memory areas.
>
>Comments appreciated.
>
>
Hi Marcelo,
Seems like a good idea... even with regular dumb kswapd "merging",
you may easily get stuck for example on systems without swap...
Anyway, I'd like to get those beat kswapd patches in first. Then
your mechanism just becomes something like:
if order-0 pages are low {
try to free memory
}
else if order-1 or higher pages are low {
try to coalesce_memory
if that fails, try to free memory
}
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next prev parent reply other threads:[~2004-10-02 2:30 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-01 18:22 Marcelo Tosatti
2004-10-01 20:11 ` Andrew Morton
2004-10-01 19:04 ` Marcelo Tosatti
2004-10-01 21:00 ` Andrew Morton
2004-10-01 21:57 ` Dave Hansen
2004-10-01 23:42 ` Marcelo Tosatti
2004-10-02 1:17 ` Andrew Morton
2004-10-02 9:30 ` Hirokazu Takahashi
2004-10-02 18:33 ` Marcelo Tosatti
2004-10-03 4:13 ` Hirokazu Takahashi
2004-10-03 14:07 ` Marcelo Tosatti
2004-10-03 18:35 ` Hirokazu Takahashi
2004-10-03 19:21 ` Trond Myklebust
2004-10-03 20:03 ` Hirokazu Takahashi
2004-10-03 20:44 ` Trond Myklebust
2004-10-04 13:02 ` Hirokazu Takahashi
2004-10-04 17:24 ` Marcelo Tosatti
2004-10-05 2:53 ` Hirokazu Takahashi
2004-10-07 12:06 ` Marcelo Tosatti
2004-10-08 7:00 ` Hirokazu Takahashi
2004-10-08 10:00 ` Marcelo Tosatti
2004-10-08 12:23 ` Hirokazu Takahashi
2004-10-08 12:41 ` Marcelo Tosatti
2004-10-08 16:52 ` Hirokazu Takahashi
2004-10-08 15:36 ` Marcelo Tosatti
2004-10-12 10:56 ` IWAMOTO Toshihiro
2004-10-12 10:35 ` Marcelo Tosatti
2004-10-12 17:55 ` Hirokazu Takahashi
2004-10-12 14:26 ` Martin J. Bligh
2004-10-12 12:17 ` Marcelo Tosatti
2004-10-12 15:01 ` Dave Hansen
2004-10-04 3:24 ` IWAMOTO Toshihiro
2004-10-04 2:22 ` Dave Hansen
2004-10-05 16:46 ` [PATCH] mhp: transfer dirty tag at radix_tree_replace Marcelo Tosatti
2004-10-05 18:35 ` Dave Hansen
2004-10-06 7:39 ` Hirokazu Takahashi
2004-10-08 8:15 ` Hirokazu Takahashi
2004-10-08 20:36 ` Marcelo Tosatti
2004-10-04 4:09 ` [RFC] memory defragmentation to satisfy high order allocations IWAMOTO Toshihiro
2004-10-04 17:29 ` Marcelo Tosatti
2004-10-02 2:30 ` Nick Piggin [this message]
2004-10-02 3:08 ` Marcelo Tosatti
2004-10-04 8:15 ` Nick Piggin
2004-10-02 2:41 ` Nick Piggin
2004-10-02 3:50 ` Hirokazu Takahashi
2004-10-02 16:06 ` Marcelo Tosatti
2004-10-04 2:38 ` Hiroyuki KAMEZAWA
2004-10-04 17:32 ` Marcelo Tosatti
2004-10-04 6:58 ` Hiroyuki KAMEZAWA
2004-10-07 15:58 ` memory hotplug and mem= Marcelo Tosatti
2004-10-07 18:36 ` Dave Hansen
2004-10-07 17:01 ` Marcelo Tosatti
2004-10-07 19:10 ` Dave Hansen
2004-10-07 20:25 ` Dave Hansen
2004-10-11 16:40 [RFC] memory defragmentation to satisfy high order allocations linux
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