From: Wu Fengguang <wfg@mail.ustc.edu.cn>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, christoph@lameter.com,
riel@redhat.com, a.p.zijlstra@chello.nl, npiggin@suse.de,
andrea@suse.de, magnus.damm@gmail.com
Subject: Re: [PATCH 02/12] mm: supporting variables and functions for balanced zone aging
Date: Sun, 4 Dec 2005 14:06:10 +0800 [thread overview]
Message-ID: <20051204060610.GA3539@mail.ustc.edu.cn> (raw)
In-Reply-To: <20051203002614.GA3140@dmt.cnet>
On Fri, Dec 02, 2005 at 10:26:14PM -0200, Marcelo Tosatti wrote:
> It seems very fragile (Wu's patches attempt to address that) in general: you
> tweak it here and watch it go nuts there.
The patch still has problems, and it can lead to more page allocations in
remote nodes.
For NUMA systems, basicly HPC applications want locality, and file servers
want cache consistency. More worse two types of applications can coexist in one
single system. The general solution may be classifying pages into two types:
local pages: mostly local accessed, and low latency is first priority
global pages: for consistent file caching
Reclaims from global pages should be balanced globally to make a seamlessly
single global cache. We can allocate special zones to hold the global pages,
and make the reclaims from them in sync. Nick, are you working on this?
Thanks,
Wu
next prev parent reply other threads:[~2005-12-04 5:56 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-01 10:18 [PATCH 00/12] Balancing the scan rate of major caches Wu Fengguang
2005-12-01 10:18 ` [PATCH 01/12] vm: kswapd incmin Wu Fengguang
2005-12-01 10:33 ` Andrew Morton
2005-12-01 11:40 ` Wu Fengguang
2005-12-01 10:18 ` [PATCH 02/12] mm: supporting variables and functions for balanced zone aging Wu Fengguang
2005-12-01 10:37 ` Andrew Morton
2005-12-01 12:11 ` Wu Fengguang
2005-12-01 22:28 ` Marcelo Tosatti
2005-12-01 23:03 ` Andrew Morton
2005-12-02 1:19 ` Wu Fengguang
2005-12-02 1:30 ` Andrew Morton
2005-12-02 2:04 ` Wu Fengguang
2005-12-02 2:18 ` Andrea Arcangeli
2005-12-02 2:37 ` Wu Fengguang
2005-12-02 2:52 ` Andrea Arcangeli
2005-12-02 4:45 ` Andrew Morton
2005-12-02 6:38 ` Wu Fengguang
2005-12-02 2:27 ` Nick Piggin
2005-12-02 2:36 ` Andrea Arcangeli
2005-12-02 2:43 ` Wu Fengguang
2005-12-02 5:49 ` Andrew Morton
2005-12-02 7:18 ` Wu Fengguang
2005-12-02 7:27 ` Andrew Morton
2005-12-02 15:13 ` Marcelo Tosatti
2005-12-02 21:39 ` Andrew Morton
2005-12-03 0:26 ` Marcelo Tosatti
2005-12-04 6:06 ` Wu Fengguang [this message]
2005-12-02 1:26 ` Marcelo Tosatti
2005-12-02 3:40 ` Andrew Morton
2005-12-01 10:18 ` [PATCH 03/12] mm: balance zone aging in direct reclaim path Wu Fengguang
2005-12-01 10:18 ` [PATCH 04/12] mm: balance zone aging in kswapd " Wu Fengguang
2005-12-01 10:18 ` [PATCH 05/12] mm: balance slab aging Wu Fengguang
2005-12-01 10:18 ` [PATCH 06/12] mm: balance active/inactive list scan rates Wu Fengguang
2005-12-01 11:39 ` Peter Zijlstra
2005-12-01 10:18 ` [PATCH 07/12] mm: remove unnecessary variable and loop Wu Fengguang
2005-12-01 10:18 ` [PATCH 08/12] mm: remove swap_cluster_max from scan_control Wu Fengguang
2005-12-01 10:18 ` [PATCH 09/12] mm: accumulate sc.nr_scanned/sc.nr_reclaimed Wu Fengguang
2005-12-01 10:18 ` [PATCH 10/12] mm: merge sc.may_writepage and sc.may_swap into sc.flags Wu Fengguang
2005-12-01 10:18 ` [PATCH 11/12] mm: add page reclaim debug traces Wu Fengguang
2005-12-01 10:18 ` [PATCH 12/12] mm: fix minor scan count bugs Wu Fengguang
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