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SubjectRe: [PATCH 0/1] mm, shmem: map few pages around fault address if they are in page cache
On Fri, 28 Feb 2014 14:18:50 -0800 Ning Qu <quning@google.com> wrote:

> This is a follow-up patch for "mm: map few pages around fault address if they are in page cache"
>
> We use the generic filemap_map_pages as ->map_pages in shmem/tmpfs.
>

Please cc Hugh on shmem/tmpfs things

>
> =========================================================================
> Below is just some simple experiment numbers from this patch, let me know if
> you would like more:
>
> Tested on Xeon machine with 64GiB of RAM, using the current default fault
> order 4.
>
> Sequential access 8GiB file
> Baseline with-patch
> 1 thread
> minor fault 205 101

Confused. Sequential access of an 8G file should generate 2,000,000
minor faults, not 205. And with FAULT_AROUND_ORDER=4, that should come
down to 2,000,000/16 minor faults when using faultaround?

> time, seconds 7.94 7.82
>
> Random access 8GiB file
> Baseline with-patch
> 1 thread
> minor fault 724 623
> time, seconds 9.75 9.84
>



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