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Message-ID: <alpine.DEB.2.02.1402171501001.25724@chino.kir.corp.google.com>
Date: Mon, 17 Feb 2014 15:14:06 -0800 (PST)
From: David Rientjes <rientjes@...gle.com>
To: Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
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>, linux-mm <linux-mm@...ck.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH V5] mm readahead: Fix readahead fail for no local
memory and limit readahead pages
On Mon, 17 Feb 2014, Nishanth Aravamudan wrote:
> Here is what I'm running into now:
>
> setup_arch ->
> do_init_bootmem ->
> cpu_numa_callback ->
> numa_setup_cpu ->
> map_cpu_to_node ->
> update_numa_cpu_lookup_table
>
> Which current updates the powerpc specific numa_cpu_lookup_table. I
> would like to update that function to use set_cpu_numa_node() and
> set_cpu_numa_mem(), but local_memory_node() is not yet functional
> because build_all_zonelists is called later in start_kernel. Would it
> make sense for first_zones_zonelist() to return NUMA_NO_NODE if we
> don't have a zone?
>
Hmm, I don't think we'll want to modify the generic first_zones_zonelist()
for a special case that is only true during boot. Instead, would it make
sense to modify numa_setup_cpu() to use the generic cpu_to_node() instead
of using a powerpc mapping and then do the set_cpu_numa_mem() after
paging_init() when the zonelists will have been built and zones without
present pages are properly excluded?
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