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

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Date:	Thu, 13 Feb 2014 13:42:11 -0800
From:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	David Rientjes <rientjes@...gle.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	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>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Anton Blanchard <anton@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [RFC PATCH V5] mm readahead: Fix readahead fail for no local
 memory and limit readahead pages

On 13.02.2014 [13:06:43 -0800], Andrew Morton wrote:
> On Thu, 13 Feb 2014 00:05:31 -0800 (PST) David Rientjes <rientjes@...gle.com> wrote:
> 
> > 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.
> 
> That (un-signed-off) powerpc patch appears to be moribund.  What's up?

Gah, thanks for catching that Andrew, not sure what went wrong. I've
appended my S-o-b. I've asked Ben to take a look, but I think he's still
catching up on his queue after travelling.

-Nish

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