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Message-ID: <4396C8B3.1020908@yahoo.com.au>
Date: Wed, 07 Dec 2005 22:34:11 +1100
From: Nick Piggin <nickpiggin@yahoo.com.au>
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To: Wu Fengguang <wfg@mail.ustc.edu.cn>
CC: linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>,
       Christoph Lameter <christoph@lameter.com>,
       Rik van Riel <riel@redhat.com>, Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Marcelo Tosatti <marcelo.tosatti@cyclades.com>,
       Magnus Damm <magnus.damm@gmail.com>, Nick Piggin <npiggin@suse.de>,
       Andrea Arcangeli <andrea@suse.de>
Subject: Re: [PATCH 06/16] mm: balance slab aging
References: <20051207104755.177435000@localhost.localdomain> <20051207105019.800865000@localhost.localdomain> <20051207110840.GC7570@mail.ustc.edu.cn>
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Wu Fengguang wrote:
> A question about the current one:
> 
> For a NUMA system with N nodes, the way kswapd calculates lru_pages - only sum
> up local zones - may cause N times more shrinking than a 1-CPU system.
> 

But it is equal pressure for all pools involved in being scaned the
simplifying assumption is that slab is equally distributed among
nodes. And yeah, scanning would load up when more than 1 kswapd is
running.

I had patches to do per-zone inode and dentry slab shrinking ages
ago, but nobody was interested... so I'm guessing it is a feature :)

-- 
SUSE Labs, Novell Inc.

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