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SubjectRe: [PATCH 16/28] mm, page_alloc: Move __GFP_HARDWALL modifications out of the fastpath
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On 04/15/2016 11:07 AM, Mel Gorman wrote:
> __GFP_HARDWALL only has meaning in the context of cpusets but the fast path
> always applies the flag on the first attempt. Move the manipulations into
> the cpuset paths where they will be masked by a static branch in the common
> case.
>
> With the other micro-optimisations in this series combined, the impact on
> a page allocator microbenchmark is
>
> 4.6.0-rc2 4.6.0-rc2
> decstat-v1r20 micro-v1r20
> Min alloc-odr0-1 381.00 ( 0.00%) 377.00 ( 1.05%)
> Min alloc-odr0-2 275.00 ( 0.00%) 273.00 ( 0.73%)
> Min alloc-odr0-4 229.00 ( 0.00%) 226.00 ( 1.31%)
> Min alloc-odr0-8 199.00 ( 0.00%) 196.00 ( 1.51%)
> Min alloc-odr0-16 186.00 ( 0.00%) 183.00 ( 1.61%)
> Min alloc-odr0-32 179.00 ( 0.00%) 175.00 ( 2.23%)
> Min alloc-odr0-64 174.00 ( 0.00%) 172.00 ( 1.15%)
> Min alloc-odr0-128 172.00 ( 0.00%) 170.00 ( 1.16%)
> Min alloc-odr0-256 181.00 ( 0.00%) 183.00 ( -1.10%)
> Min alloc-odr0-512 193.00 ( 0.00%) 191.00 ( 1.04%)
> Min alloc-odr0-1024 201.00 ( 0.00%) 199.00 ( 1.00%)
> Min alloc-odr0-2048 206.00 ( 0.00%) 204.00 ( 0.97%)
> Min alloc-odr0-4096 212.00 ( 0.00%) 210.00 ( 0.94%)
> Min alloc-odr0-8192 215.00 ( 0.00%) 213.00 ( 0.93%)
> Min alloc-odr0-16384 216.00 ( 0.00%) 214.00 ( 0.93%)
>
> Signed-off-by: Mel Gorman <mgorman@techsingularity.net>

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

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