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SubjectRe: [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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