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| author | Mel Gorman <mgorman@techsingularity.net> | 2016-05-19 17:13:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-05-19 19:12:14 -0700 |
| commit | b9f00e147f27d86691f7f52a3c8126d25432477c (patch) | |
| tree | 50763ffda93c2279992fcb447c48aad908de07c4 /mm/page_alloc.c | |
| parent | 175145748d00794369317070dd19ce12dd816241 (diff) | |
| download | lwn-b9f00e147f27d86691f7f52a3c8126d25432477c.tar.gz lwn-b9f00e147f27d86691f7f52a3c8126d25432477c.zip | |
mm, page_alloc: reduce branches in zone_statistics
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>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
0 files changed, 0 insertions, 0 deletions