Messages in this thread | | | Subject | Re: [LKP] [mm] 3484b2de949: -46.2% aim7.jobs-per-min | From | Huang Ying <> | Date | Sat, 28 Feb 2015 10:42:49 +0800 |
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On Sat, 2015-02-28 at 10:30 +0800, Huang Ying wrote: > On Sat, 2015-02-28 at 01:46 +0000, Mel Gorman wrote: > > On Fri, Feb 27, 2015 at 03:21:36PM +0800, Huang Ying wrote: > > > FYI, we noticed the below changes on > > > > > > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > > > commit 3484b2de9499df23c4604a513b36f96326ae81ad ("mm: rearrange zone fields into read-only, page alloc, statistics and page reclaim lines") > > > > > > The perf cpu-cycles for spinlock (zone->lock) increased a lot. I suspect there are some cache ping-pong or false sharing. > > > > > > > Are you sure about this result? I ran similar tests here and found that > > there was a major regression introduced near there but it was commit > > 05b843012335 ("mm: memcontrol: use root_mem_cgroup res_counter") that > > cause the problem and it was later reverted. On local tests on a 4-node > > machine, commit 3484b2de9499df23c4604a513b36f96326ae81ad was within 1% > > of the previous commit and well within the noise. > > I have double checked the result before sending out. > > Do you do the test with same kernel config and test case/parameters > (aim7/page_test/load 6000)?
Or you can show your test case and parameters and I can try that too.
Best Regards, Huang, Ying
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