linux-kernel - Re: [RFC PATCH V5] mm readahead: Fix readahead fail for no local memory and limit readahead pages

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Message-ID: <alpine.DEB.2.02.1402130003320.11689@chino.kir.corp.google.com>
Date:	Thu, 13 Feb 2014 00:05:31 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	David Cohen <david.a.cohen@...ux.intel.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Damien Ramonda <damien.ramonda@...el.com>,
	Jan Kara <jack@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH V5] mm readahead: Fix readahead fail for no local
 memory and limit readahead pages

On Thu, 13 Feb 2014, Raghavendra K T wrote:

> I was able to test (1) implementation on the system where readahead problem
> occurred. Unfortunately it did not help.
> 
> Reason seem to be that CONFIG_HAVE_MEMORYLESS_NODES dependency of
> numa_mem_id(). The PPC machine I am facing problem has topology like
> this:
> 
> numactl -H
> ---------
> available: 2 nodes (0-1)
> node 0 cpus: 0 1 2 3 4 5 6 7 12 13 14 15 16 17 18 19 20 21 22 23 24 25
> ...
> node 0 size: 0 MB
> node 0 free: 0 MB
> node 1 cpus: 8 9 10 11 32 33 34 35 ...
> node 1 size: 8071 MB
> node 1 free: 2479 MB
> node distances:
> node   0   1
>   0:  10  20
>   1:  20  10
> 
> So it seems numa_mem_id() does not help for all the configs..
> Am I missing something ?
> 

You need the patch from http://marc.info/?l=linux-mm&m=139093411119013 
first.
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