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Groups > linux.kernel > #1386263
| From | Vlastimil Babka <vbabka@suse.cz> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 03/28] mm, page_alloc: Reduce branches in zone_statistics |
| Date | 2016-04-25 13:20 +0200 |
| Message-ID | <rrMIx-4QJ-13@gated-at.bofh.it> (permalink) |
| References | <ro7LB-hc-17@gated-at.bofh.it> <ro7Vi-Er-53@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 04/15/2016 10:58 AM, Mel Gorman wrote: > zone_statistics has more branches than it really needs to take an > unlikely GFP flag into account. Reduce the number and annotate > the unlikely flag. > > The performance difference on a page allocator microbenchmark is; > > 4.6.0-rc2 4.6.0-rc2 > nocompound-v1r10 statbranch-v1r10 > Min alloc-odr0-1 417.00 ( 0.00%) 419.00 ( -0.48%) > Min alloc-odr0-2 308.00 ( 0.00%) 305.00 ( 0.97%) > Min alloc-odr0-4 253.00 ( 0.00%) 250.00 ( 1.19%) > Min alloc-odr0-8 221.00 ( 0.00%) 219.00 ( 0.90%) > Min alloc-odr0-16 205.00 ( 0.00%) 203.00 ( 0.98%) > Min alloc-odr0-32 199.00 ( 0.00%) 195.00 ( 2.01%) > Min alloc-odr0-64 193.00 ( 0.00%) 191.00 ( 1.04%) > Min alloc-odr0-128 191.00 ( 0.00%) 189.00 ( 1.05%) > Min alloc-odr0-256 200.00 ( 0.00%) 198.00 ( 1.00%) > Min alloc-odr0-512 212.00 ( 0.00%) 210.00 ( 0.94%) > Min alloc-odr0-1024 219.00 ( 0.00%) 216.00 ( 1.37%) > Min alloc-odr0-2048 225.00 ( 0.00%) 221.00 ( 1.78%) > Min alloc-odr0-4096 231.00 ( 0.00%) 227.00 ( 1.73%) > Min alloc-odr0-8192 234.00 ( 0.00%) 232.00 ( 0.85%) > Min alloc-odr0-16384 234.00 ( 0.00%) 232.00 ( 0.85%) > > Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Vlastimil Babka <vbabka@suse.cz>
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Re: [PATCH 03/28] mm, page_alloc: Reduce branches in zone_statistics Vlastimil Babka <vbabka@suse.cz> - 2016-04-25 13:20 +0200
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