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SubjectRe: [PATCH] mm: page_alloc: High-order per-cpu page allocator v3
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On 11/27/2016 02:19 PM, Mel Gorman wrote:
>
> 2-socket modern machine
> 4.9.0-rc5 4.9.0-rc5
> vanilla hopcpu-v3
> Hmean send-64 178.38 ( 0.00%) 256.74 ( 43.93%)
> Hmean send-128 351.49 ( 0.00%) 507.52 ( 44.39%)
> Hmean send-256 671.23 ( 0.00%) 1004.19 ( 49.60%)
> Hmean send-1024 2663.60 ( 0.00%) 3910.42 ( 46.81%)
> Hmean send-2048 5126.53 ( 0.00%) 7562.13 ( 47.51%)
> Hmean send-3312 7949.99 ( 0.00%) 11565.98 ( 45.48%)
> Hmean send-4096 9433.56 ( 0.00%) 12929.67 ( 37.06%)
> Hmean send-8192 15940.64 ( 0.00%) 21587.63 ( 35.43%)
> Hmean send-16384 26699.54 ( 0.00%) 32013.79 ( 19.90%)
> Hmean recv-64 178.38 ( 0.00%) 256.72 ( 43.92%)
> Hmean recv-128 351.49 ( 0.00%) 507.47 ( 44.38%)
> Hmean recv-256 671.20 ( 0.00%) 1003.95 ( 49.57%)
> Hmean recv-1024 2663.45 ( 0.00%) 3909.70 ( 46.79%)
> Hmean recv-2048 5126.26 ( 0.00%) 7560.67 ( 47.49%)
> Hmean recv-3312 7949.50 ( 0.00%) 11564.63 ( 45.48%)
> Hmean recv-4096 9433.04 ( 0.00%) 12927.48 ( 37.04%)
> Hmean recv-8192 15939.64 ( 0.00%) 21584.59 ( 35.41%)
> Hmean recv-16384 26698.44 ( 0.00%) 32009.77 ( 19.89%)
>
> 1-socket 6 year old machine
> 4.9.0-rc5 4.9.0-rc5
> vanilla hopcpu-v3
> Hmean send-64 87.47 ( 0.00%) 127.14 ( 45.36%)
> Hmean send-128 174.36 ( 0.00%) 256.42 ( 47.06%)
> Hmean send-256 347.52 ( 0.00%) 509.41 ( 46.59%)
> Hmean send-1024 1363.03 ( 0.00%) 1991.54 ( 46.11%)
> Hmean send-2048 2632.68 ( 0.00%) 3759.51 ( 42.80%)
> Hmean send-3312 4123.19 ( 0.00%) 5873.28 ( 42.45%)
> Hmean send-4096 5056.48 ( 0.00%) 7072.81 ( 39.88%)
> Hmean send-8192 8784.22 ( 0.00%) 12143.92 ( 38.25%)
> Hmean send-16384 15081.60 ( 0.00%) 19812.71 ( 31.37%)
> Hmean recv-64 86.19 ( 0.00%) 126.59 ( 46.87%)
> Hmean recv-128 173.93 ( 0.00%) 255.21 ( 46.73%)
> Hmean recv-256 346.19 ( 0.00%) 506.72 ( 46.37%)
> Hmean recv-1024 1358.28 ( 0.00%) 1980.03 ( 45.77%)
> Hmean recv-2048 2623.45 ( 0.00%) 3729.35 ( 42.15%)
> Hmean recv-3312 4108.63 ( 0.00%) 5831.47 ( 41.93%)
> Hmean recv-4096 5037.25 ( 0.00%) 7021.59 ( 39.39%)
> Hmean recv-8192 8762.32 ( 0.00%) 12072.44 ( 37.78%)
> Hmean recv-16384 15042.36 ( 0.00%) 19690.14 ( 30.90%)

That looks way much better than the "v1" RFC posting. Was it just
because you stopped doing the "at first iteration, use migratetype as
index", and initializing pindex UINT_MAX hits so much quicker, or was
there something more subtle that I missed? There was no changelog
between "v1" and "v2".

>
> Signed-off-by: Mel Gorman <mgorman@techsingularity.net>

Acked-by: Vlastimil Babka <vbabka@suse.cz>


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