[V2] powerpc/mm/radix: Update pte fragment count from 16 to 256 on radix

Michael Ellerman patch-notifications at ellerman.id.au
Thu Apr 5 00:39:49 AEST 2018


On Thu, 2018-03-22 at 08:43:50 UTC, "Aneesh Kumar K.V" wrote:
> Right now we use only 4K out of the 64k page allocated for the level 4 page
> table. W.r.t the performance impact due to lock contention, with ebizzy
> 
> 256 threads:
> without patch (10 runs of ./ebizzy  -m -n 1000 -s 131072 -S 100)
> median = 15678.5
> stdev = 42.1209
> 
> with patch:
> median = 15354
> stdev = 194.743
> 
> This is with THP disabled. With THP enabled the impact of the patch will be less.
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/fb4e5dbd44564077fa0267a59b4596

cheers


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