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

[Raghavendra K T]

On 02/13/2014 01:35 PM, David Rientjes 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:
[...]
> > 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.

Thanks David, unfortunately even after applying that patch, I do not see
the improvement.

Interestingly numa_mem_id() seem to still return the value of a
memoryless node.
May be  per cpu _numa_mem_ values are not set properly. Need to dig out ....

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