Re: [RFC][PATCH 0/6] Another go at speculative page faults

[Lai Jiangshan <laijs@cn.fujitsu.com>]

On 10/22/2014 01:56 AM, Peter Zijlstra wrote:
> On Tue, Oct 21, 2014 at 08:09:48PM +0300, Kirill A. Shutemov wrote:
>> It would be interesting to see if the patchset affects non-condended case.
>> Like a one-threaded workload.
> 
> It does, and not in a good way, I'll have to look at that... :/

Maybe it is blamed to find_vma_srcu() that it doesn't take the advantage of
the vmacache_find() and cause more cache-misses.


Is it hard to use the vmacache in the find_vma_srcu()?

> 
>  Performance counter stats for './multi-fault 1' (5 runs):
> 
>         73,860,251      page-faults                                                   ( +-  0.28% )
>             40,914      cache-misses                                                  ( +- 41.26% )
> 
>       60.001484913 seconds time elapsed                                          ( +-  0.00% )
> 
> 
>  Performance counter stats for './multi-fault 1' (5 runs):
> 
>         70,700,838      page-faults                                                   ( +-  0.03% )
>             31,466      cache-misses                                                  ( +-  8.62% )
> 
>       60.001753906 seconds time elapsed                                          ( +-  0.00% )
> .
> 

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