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

[Raghavendra K T]

On 01/22/2014 04:23 PM, Raghavendra K T wrote:
> max_sane_readahead returns zero on the cpu having no local memory
> node. Fix that by returning a sanitized number of pages viz.,
> minimum of (requested pages, 4k)
>
> Result:
> fadvise experiment with FADV_WILLNEED on a x240 machine with 1GB testfile
> 32GB* 4G RAM  numa machine ( 12 iterations) yielded
>
> Kernel     Avg      Stddev
> base      7.2963    1.10 %
> patched   7.2972    1.18 %
>
> Reviewed-by: Jan Kara <jack@xxxxxxx>
> Signed-off-by: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>
> ---

Could you please let me know what do you feel about the patch ?


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