On Thu, Jun 02, 2016 at 12:07:06PM -0400, Johannes Weiner wrote:
>Hi,
>
>On Thu, Jun 02, 2016 at 02:45:07PM +0800, kernel test robot wrote:
>> FYI, we noticed pixz.throughput -9.1% regression due to commit:
>>
>> commit 795ae7a0de6b834a0cc202aa55c190ef81496665 ("mm: scale kswapd
>> watermarks in proportion to memory")
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>
>> in testcase: pixz
>> on test machine: ivb43: 48 threads Ivytown Ivy Bridge-EP with 64G memory
>> with following parameters: cpufreq_governor=performance/nr_threads=100%
>
>Xiaolong, thanks for the report.
>
>It looks like the regression stems from a change in NUMA placement:
>
>> 3ed3a4f0ddffece9 795ae7a0de6b834a0cc202aa55
>> ---------------- --------------------------
>> %stddev %change %stddev
>> \ | \
>> 78505362 ± 0% -9.1% 71324131 ± 0% pixz.throughput
>> 4530 ± 0% +1.0% 4575 ± 0%
>> pixz.time.percent_of_cpu_this_job_got
>> 14911 ± 0% +2.3% 15251 ± 0% pixz.time.user_time
>> 6586930 ± 0% -7.5% 6093751 ± 1%
>> pixz.time.voluntary_context_switches
>> 49869 ± 1% -9.0% 45401 ± 0% vmstat.system.cs
>> 26406 ± 4% -9.4% 23922 ± 5% numa-meminfo.node0.SReclaimable
>> 4803 ± 85% -87.0% 625.25 ± 16%
>> numa-meminfo.node1.Inactive(anon)
>> 946.75 ± 3% +775.4% 8288 ± 1% proc-vmstat.nr_alloc_batch
>> 2403080 ± 2% -58.4% 999765 ± 0% proc-vmstat.pgalloc_dma32
>
>a bit clearer in the will-it-scale report:
>
>> 3ed3a4f0ddffece9 795ae7a0de6b834a0cc202aa55
>> ---------------- --------------------------
>> %stddev %change %stddev
>> \ | \
>> 442409 ± 0% -8.5% 404670 ± 0% will-it-scale.per_process_ops
>> 397397 ± 0% -6.2% 372741 ± 0% will-it-scale.per_thread_ops
>> 0.11 ± 1% -15.1% 0.10 ± 0% will-it-scale.scalability
>> 9933 ± 10% +17.8% 11696 ± 4%
>> will-it-scale.time.involuntary_context_switches
>> 5158470 ± 3% +5.4% 5438873 ± 0%
>> will-it-scale.time.maximum_resident_set_size
>> 10701739 ± 0% -11.6% 9456315 ± 0%
>> will-it-scale.time.minor_page_faults
>> 825.00 ± 0% +7.8% 889.75 ± 0%
>> will-it-scale.time.percent_of_cpu_this_job_got
>> 2484 ± 0% +7.8% 2678 ± 0% will-it-scale.time.system_time
>> 81.98 ± 0% +8.7% 89.08 ± 0% will-it-scale.time.user_time
>> 848972 ± 1% -13.3% 735967 ± 0%
>> will-it-scale.time.voluntary_context_switches
>> 19395253 ± 0% -20.0% 15511908 ± 0% numa-numastat.node0.local_node
>> 19400671 ± 0% -20.0% 15518877 ± 0% numa-numastat.node0.numa_hit
>
>The way this test is set up (in-memory compression on 48 nodes) I'm
>surprised we spill over, though, even with the higher watermarks.
>
>Xiaolong, could you provide the full /proc/zoneinfo of that machine
>right before the test is running? I wonder if it's mostly filled with
Hi, Johannes
Please refer to attached proc-zoneinfo file which was obtained by cat
/proc/zoneinfo
on test machine ivb43 right before the test (pigxz) was launched.
Thanks,
Xiaolong
>cache, and the increase in watermarks causes a higher portion of the
>anon allocs and frees to spill to the remote node, but never enough to
>enter the allocator slowpath and waking kswapd to fix it.
>
>Another suspect is the fair zone allocator, whose allocation batches
>increased as well. It shouldn't affect NUMA placement, but I wonder if
>there is a bug in there that causes false spilling to foreign nodes
>that was only bounded by the allocation batch of the foreign zone.
>Mel, does such a symptom sound familiar in any way?
>
>I'll continue to investigate.
Node 0, zone DMA
pages free 3937
min 1
low 4
high 7
scanned 0
spanned 4095
present 3983
managed 3961
nr_free_pages 3937
nr_alloc_batch 3
nr_inactive_anon 0
nr_active_anon 0
nr_inactive_file 22
nr_active_file 2
nr_unevictable 0
nr_mlock 0
nr_anon_pages 0
nr_mapped 0
nr_file_pages 24
nr_dirty 0
nr_writeback 0
nr_slab_reclaimable 0
nr_slab_unreclaimable 0
nr_page_table_pages 0
nr_kernel_stack 0
nr_unstable 0
nr_bounce 0
nr_vmscan_write 0
nr_vmscan_immediate_reclaim 0
nr_writeback_temp 0
nr_isolated_anon 0
nr_isolated_file 0
nr_shmem 0
nr_dirtied 0
nr_written 0
nr_pages_scanned 0
numa_hit 24
numa_miss 0
numa_foreign 0
numa_interleave 0
numa_local 0
numa_other 24
workingset_refault 0
workingset_activate 0
workingset_nodereclaim 0
nr_anon_transparent_hugepages 0
nr_free_cma 0
protection: (0, 2913, 32081, 32081)
pagesets
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vm stats threshold: 12
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cpu: 47
count: 0
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vm stats threshold: 12
all_unreclaimable: 0
start_pfn: 1
inactive_ratio: 1
Node 0, zone DMA32
pages free 734480
min 367
low 1112
high 1857
scanned 0
spanned 1044480
present 762317
managed 745925
nr_free_pages 734480
nr_alloc_batch 745
nr_inactive_anon 18
nr_active_anon 498
nr_inactive_file 4689
nr_active_file 832
nr_unevictable 0
nr_mlock 0
nr_anon_pages 486
nr_mapped 171
nr_file_pages 5551
nr_dirty 0
nr_writeback 0
nr_slab_reclaimable 376
nr_slab_unreclaimable 643
nr_page_table_pages 181
nr_kernel_stack 19
nr_unstable 0
nr_bounce 0
nr_vmscan_write 0
nr_vmscan_immediate_reclaim 0
nr_writeback_temp 0
nr_isolated_anon 0
nr_isolated_file 0
nr_shmem 30
nr_dirtied 0
nr_written 0
nr_pages_scanned 0
numa_hit 15403
numa_miss 0
numa_foreign 0
numa_interleave 0
numa_local 9596
numa_other 5807
workingset_refault 0
workingset_activate 0
workingset_nodereclaim 0
nr_anon_transparent_hugepages 0
nr_free_cma 0
protection: (0, 0, 29167, 29167)
pagesets
cpu: 0
count: 31
high: 186
batch: 31
vm stats threshold: 72
cpu: 1
count: 132
high: 186
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vm stats threshold: 72
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count: 114
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vm stats threshold: 72
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vm stats threshold: 72
cpu: 47
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vm stats threshold: 72
all_unreclaimable: 0
start_pfn: 4096
inactive_ratio: 4
Node 0, zone Normal
pages free 7347192
min 3673
low 11139
high 18605
scanned 0
spanned 7602176
present 7602176
managed 7466912
nr_free_pages 7347192
nr_alloc_batch 3092
nr_inactive_anon 2121
nr_active_anon 5661
nr_inactive_file 42926
nr_active_file 12284
nr_unevictable 0
nr_mlock 0
nr_anon_pages 5490
nr_mapped 2797
nr_file_pages 57359
nr_dirty 0
nr_writeback 0
nr_slab_reclaimable 5809
nr_slab_unreclaimable 11941
nr_page_table_pages 764
nr_kernel_stack 604
nr_unstable 0
nr_bounce 0
nr_vmscan_write 0
nr_vmscan_immediate_reclaim 0
nr_writeback_temp 0
nr_isolated_anon 0
nr_isolated_file 0
nr_shmem 2149
nr_dirtied 0
nr_written 0
nr_pages_scanned 0
numa_hit 168863
numa_miss 0
numa_foreign 0
numa_interleave 75154
numa_local 107939
numa_other 60924
workingset_refault 0
workingset_activate 0
workingset_nodereclaim 0
nr_anon_transparent_hugepages 1
nr_free_cma 0
protection: (0, 0, 0, 0)
pagesets
cpu: 0
count: 92
high: 186
batch: 31
vm stats threshold: 108
cpu: 1
count: 157
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batch: 31
vm stats threshold: 108
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count: 185
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vm stats threshold: 108
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count: 167
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count: 122
high: 186
batch: 31
vm stats threshold: 108
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count: 166
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vm stats threshold: 108
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count: 170
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count: 170
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batch: 31
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count: 179
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count: 155
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count: 167
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vm stats threshold: 108
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count: 169
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vm stats threshold: 108
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vm stats threshold: 108
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vm stats threshold: 108
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vm stats threshold: 108
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batch: 31
vm stats threshold: 108
cpu: 47
count: 118
high: 186
batch: 31
vm stats threshold: 108
all_unreclaimable: 0
start_pfn: 1048576
inactive_ratio: 16
Node 1, zone Normal
pages free 8134711
min 4058
low 12305
high 20552
scanned 0
spanned 8388608
present 8388608
managed 8248533
nr_free_pages 8134711
nr_alloc_batch 7811
nr_inactive_anon 124
nr_active_anon 2943
nr_inactive_file 48888
nr_active_file 11896
nr_unevictable 0
nr_mlock 0
nr_anon_pages 2889
nr_mapped 1628
nr_file_pages 60929
nr_dirty 0
nr_writeback 0
nr_slab_reclaimable 5495
nr_slab_unreclaimable 10115
nr_page_table_pages 846
nr_kernel_stack 214
nr_unstable 0
nr_bounce 0
nr_vmscan_write 0
nr_vmscan_immediate_reclaim 0
nr_writeback_temp 0
nr_isolated_anon 0
nr_isolated_file 0
nr_shmem 145
nr_dirtied 0
nr_written 0
nr_pages_scanned 0
numa_hit 156983
numa_miss 0
numa_foreign 0
numa_interleave 80425
numa_local 132002
numa_other 24981
workingset_refault 0
workingset_activate 0
workingset_nodereclaim 0
nr_anon_transparent_hugepages 0
nr_free_cma 0
protection: (0, 0, 0, 0)
pagesets
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batch: 31
vm stats threshold: 108
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vm stats threshold: 108
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vm stats threshold: 108
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vm stats threshold: 108
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vm stats threshold: 108
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batch: 31
vm stats threshold: 108
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count: 169
high: 186
batch: 31
vm stats threshold: 108
cpu: 18
count: 177
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batch: 31
vm stats threshold: 108
cpu: 19
count: 153
high: 186
batch: 31
vm stats threshold: 108
cpu: 20
count: 83
high: 186
batch: 31
vm stats threshold: 108
cpu: 21
count: 70
high: 186
batch: 31
vm stats threshold: 108
cpu: 22
count: 138
high: 186
batch: 31
vm stats threshold: 108
cpu: 23
count: 42
high: 186
batch: 31
vm stats threshold: 108
cpu: 24
count: 45
high: 186
batch: 31
vm stats threshold: 108
cpu: 25
count: 156
high: 186
batch: 31
vm stats threshold: 108
cpu: 26
count: 45
high: 186
batch: 31
vm stats threshold: 108
cpu: 27
count: 165
high: 186
batch: 31
vm stats threshold: 108
cpu: 28
count: 178
high: 186
batch: 31
vm stats threshold: 108
cpu: 29
count: 86
high: 186
batch: 31
vm stats threshold: 108
cpu: 30
count: 185
high: 186
batch: 31
vm stats threshold: 108
cpu: 31
count: 154
high: 186
batch: 31
vm stats threshold: 108
cpu: 32
count: 152
high: 186
batch: 31
vm stats threshold: 108
cpu: 33
count: 176
high: 186
batch: 31
vm stats threshold: 108
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batch: 31
vm stats threshold: 108
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batch: 31
vm stats threshold: 108
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batch: 31
vm stats threshold: 108
cpu: 37
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batch: 31
vm stats threshold: 108
cpu: 38
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batch: 31
vm stats threshold: 108
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count: 107
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batch: 31
vm stats threshold: 108
cpu: 40
count: 92
high: 186
batch: 31
vm stats threshold: 108
cpu: 41
count: 130
high: 186
batch: 31
vm stats threshold: 108
cpu: 42
count: 100
high: 186
batch: 31
vm stats threshold: 108
cpu: 43
count: 38
high: 186
batch: 31
vm stats threshold: 108
cpu: 44
count: 166
high: 186
batch: 31
vm stats threshold: 108
cpu: 45
count: 24
high: 186
batch: 31
vm stats threshold: 108
cpu: 46
count: 45
high: 186
batch: 31
vm stats threshold: 108
cpu: 47
count: 72
high: 186
batch: 31
vm stats threshold: 108
all_unreclaimable: 0
start_pfn: 8650752
inactive_ratio: 17
