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SubjectRe: [lkp-robot] [mm/cma] 2b0f904a5a: fio.read_bw_MBps -16.1% regression
Hello!

On Tue, Jan 02, 2018 at 02:35:28PM +0800, kernel test robot wrote:
>
> Greeting,
>
> FYI, we noticed a -16.1% regression of fio.read_bw_MBps due to commit:
>
>
> commit: 2b0f904a5a8781498417d67226fd12c5e56053ae ("mm/cma: manage the memory of the CMA area by using the ZONE_MOVABLE")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
>
> in testcase: fio-basic
> on test machine: 56 threads Intel(R) Xeon(R) CPU E5-2695 v3 @ 2.30GHz with 256G memory
> with following parameters:
>
> disk: 2pmem
> fs: ext4
> runtime: 200s
> nr_task: 50%
> time_based: tb
> rw: randread
> bs: 2M
> ioengine: mmap
> test_size: 200G
> cpufreq_governor: performance
>
> test-description: Fio is a tool that will spawn a number of threads or processes doing a particular type of I/O action as specified by the user.
> test-url: https://github.com/axboe/fio
>
>
>
> Details are as below:
> -------------------------------------------------------------------------------------------------->
>
>
> To reproduce:
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp install job.yaml # job file is attached in this email
> bin/lkp run job.yaml
>
> =========================================================================================
> bs/compiler/cpufreq_governor/disk/fs/ioengine/kconfig/nr_task/rootfs/runtime/rw/tbox_group/test_size/testcase/time_based:
> 2M/gcc-7/performance/2pmem/ext4/mmap/x86_64-rhel-7.2/50%/debian-x86_64-2016-08-31.cgz/200s/randread/lkp-hsw-ep6/200G/fio-basic/tb
>
> commit:
> f6572f9cd2 ("mm/page_alloc: don't reserve ZONE_HIGHMEM for ZONE_MOVABLE request")
> 2b0f904a5a ("mm/cma: manage the memory of the CMA area by using the ZONE_MOVABLE")
>
> f6572f9cd248df2c 2b0f904a5a8781498417d67226
> ---------------- --------------------------
> %stddev %change %stddev
> \ | \
> 11451 -16.1% 9605 fio.read_bw_MBps
> 0.29 ± 5% +0.1 0.40 ± 3% fio.latency_1000us%
> 19.35 ± 5% -4.7 14.69 ± 3% fio.latency_10ms%
> 7.92 ± 3% +12.2 20.15 fio.latency_20ms%
> 0.05 ± 11% +0.0 0.09 ± 8% fio.latency_2ms%
> 70.22 -8.9 61.36 fio.latency_4ms%
> 0.29 ± 13% +0.0 0.33 ± 3% fio.latency_500us%
> 0.45 ± 29% +1.0 1.45 ± 4% fio.latency_50ms%
> 1.37 +0.1 1.44 fio.latency_750us%
> 9792 +31.7% 12896 fio.read_clat_90%_us
> 10560 +33.0% 14048 fio.read_clat_95%_us
> 15376 ± 10% +46.9% 22592 fio.read_clat_99%_us
> 4885 +19.2% 5825 fio.read_clat_mean_us
> 5725 -16.1% 4802 fio.read_iops
> 4.598e+09 -16.4% 3.845e+09 fio.time.file_system_inputs
> 453153 -8.4% 415215 fio.time.involuntary_context_switches
> 5.748e+08 -16.4% 4.806e+08 fio.time.major_page_faults
> 1822257 +23.7% 2254706 fio.time.maximum_resident_set_size
> 5089 +1.6% 5172 fio.time.system_time
> 514.50 -16.3% 430.48 fio.time.user_time

System time is increased and user time is decreased. On the below, there is a clue.

> 24569 ± 2% +9.6% 26917 ± 2% fio.time.voluntary_context_switches
> 54443725 -14.9% 46353339 interrupts.CAL:Function_call_interrupts
> 0.00 ± 79% -0.0 0.00 ± 17% mpstat.cpu.iowait%
> 4.45 -0.7 3.71 mpstat.cpu.usr%
> 1467516 +21.3% 1779543 ± 3% meminfo.Active
> 1276031 +23.7% 1578443 ± 4% meminfo.Active(file)
> 25789 ± 3% -76.7% 6013 ± 4% meminfo.CmaFree
> 1.296e+08 -12.6% 1.133e+08 turbostat.IRQ
> 41.89 -3.4% 40.47 turbostat.RAMWatt
> 17444 ± 2% -13.5% 15092 ± 3% turbostat.SMI
> 10896428 -16.4% 9111830 vmstat.io.bi
> 6010 -6.2% 5637 vmstat.system.cs
> 317438 -12.1% 278980 vmstat.system.in
> 1072892 ± 3% +21.5% 1303487 numa-meminfo.node0.Active
> 978318 +21.6% 1189809 ± 2% numa-meminfo.node0.Active(file)
> 222968 -25.2% 166818 numa-meminfo.node0.PageTables
> 47374 ± 2% +10.6% 52402 ± 7% numa-meminfo.node0.SUnreclaim
> 165213 +31.9% 217870 numa-meminfo.node1.PageTables
> 222405 +10.4% 245633 ± 2% numa-meminfo.node1.SReclaimable
> 102992 ± 46% -80.8% 19812 ± 38% numa-meminfo.node1.Shmem
> 2.475e+08 ± 2% -24.0% 1.881e+08 numa-numastat.node0.local_node
> 39371795 ± 14% +167.1% 1.052e+08 ± 2% numa-numastat.node0.numa_foreign
> 2.475e+08 ± 2% -24.0% 1.881e+08 numa-numastat.node0.numa_hit
> 31890417 ± 17% +40.2% 44705135 ± 8% numa-numastat.node0.numa_miss
> 31899482 ± 17% +40.2% 44713255 ± 8% numa-numastat.node0.other_node
> 2.566e+08 ± 2% -44.2% 1.433e+08 numa-numastat.node1.local_node
> 31890417 ± 17% +40.2% 44705135 ± 8% numa-numastat.node1.numa_foreign
> 2.566e+08 ± 2% -44.2% 1.433e+08 numa-numastat.node1.numa_hit
> 39371795 ± 14% +167.1% 1.052e+08 ± 2% numa-numastat.node1.numa_miss
> 39373660 ± 14% +167.1% 1.052e+08 ± 2% numa-numastat.node1.other_node
> 6047 ± 39% -66.5% 2028 ± 63% sched_debug.cfs_rq:/.exec_clock.min
> 461.37 ± 8% +64.9% 760.74 ± 20% sched_debug.cfs_rq:/.load_avg.avg
> 1105 ± 13% +1389.3% 16467 ± 56% sched_debug.cfs_rq:/.load_avg.max
> 408.99 ± 3% +495.0% 2433 ± 49% sched_debug.cfs_rq:/.load_avg.stddev
> 28746 ± 12% -18.7% 23366 ± 14% sched_debug.cfs_rq:/.min_vruntime.min
> 752426 ± 3% -12.7% 656636 ± 4% sched_debug.cpu.avg_idle.avg
> 144956 ± 61% -85.4% 21174 ± 26% sched_debug.cpu.avg_idle.min
> 245684 ± 11% +44.6% 355257 ± 2% sched_debug.cpu.avg_idle.stddev
> 236035 ± 15% +51.8% 358264 ± 16% sched_debug.cpu.nr_switches.max
> 42039 ± 22% +34.7% 56616 ± 8% sched_debug.cpu.nr_switches.stddev
> 3204 ± 24% -48.1% 1663 ± 30% sched_debug.cpu.sched_count.min
> 2132 ± 25% +38.7% 2957 ± 11% sched_debug.cpu.sched_count.stddev
> 90.67 ± 32% -71.8% 25.58 ± 26% sched_debug.cpu.sched_goidle.min
> 6467 ± 15% +22.3% 7912 ± 15% sched_debug.cpu.ttwu_count.max
> 1513 ± 27% -55.7% 670.92 ± 22% sched_debug.cpu.ttwu_count.min
> 1025 ± 20% +68.4% 1727 ± 9% sched_debug.cpu.ttwu_count.stddev
> 1057 ± 16% -62.9% 391.85 ± 31% sched_debug.cpu.ttwu_local.min
> 244876 +21.6% 297770 ± 2% numa-vmstat.node0.nr_active_file
> 88.00 ± 5% +19.3% 105.00 ± 5% numa-vmstat.node0.nr_isolated_file
> 55778 -25.1% 41765 numa-vmstat.node0.nr_page_table_pages
> 11843 ± 2% +10.6% 13100 ± 7% numa-vmstat.node0.nr_slab_unreclaimable
> 159.25 ± 42% -74.9% 40.00 ± 52% numa-vmstat.node0.nr_vmscan_immediate_reclaim
> 244862 +21.6% 297739 ± 2% numa-vmstat.node0.nr_zone_active_file
> 19364320 ± 19% +187.2% 55617595 ± 2% numa-vmstat.node0.numa_foreign
> 268155 ± 3% +49.6% 401089 ± 4% numa-vmstat.node0.workingset_activate
> 1.229e+08 -19.0% 99590617 numa-vmstat.node0.workingset_refault
> 6345 ± 3% -76.5% 1489 ± 3% numa-vmstat.node1.nr_free_cma
> 41335 +32.0% 54552 numa-vmstat.node1.nr_page_table_pages
> 25770 ± 46% -80.8% 4956 ± 38% numa-vmstat.node1.nr_shmem
> 55684 +10.4% 61475 ± 2% numa-vmstat.node1.nr_slab_reclaimable
> 1.618e+08 ± 8% -47.6% 84846798 ± 17% numa-vmstat.node1.numa_hit
> 1.617e+08 ± 8% -47.6% 84676284 ± 17% numa-vmstat.node1.numa_local
> 19365342 ± 19% +187.2% 55620100 ± 2% numa-vmstat.node1.numa_miss
> 19534837 ± 19% +185.6% 55790654 ± 2% numa-vmstat.node1.numa_other
> 1.296e+08 -21.0% 1.024e+08 numa-vmstat.node1.workingset_refault
> 1.832e+12 -7.5% 1.694e+12 perf-stat.branch-instructions
> 0.25 -0.0 0.23 perf-stat.branch-miss-rate%
> 4.666e+09 -16.0% 3.918e+09 perf-stat.branch-misses
> 39.88 +1.1 40.98 perf-stat.cache-miss-rate%
> 2.812e+10 -11.6% 2.485e+10 perf-stat.cache-misses
> 7.051e+10 -14.0% 6.064e+10 perf-stat.cache-references
> 1260521 -6.1% 1183071 perf-stat.context-switches
> 1.87 +9.6% 2.05 perf-stat.cpi
> 6707 ± 2% -5.2% 6359 perf-stat.cpu-migrations
> 1.04 ± 11% -0.3 0.77 ± 4% perf-stat.dTLB-load-miss-rate%
> 2.365e+10 ± 7% -25.9% 1.751e+10 ± 9% perf-stat.dTLB-load-misses
> 1.05e+12 ± 4% -9.5% 9.497e+11 ± 2% perf-stat.dTLB-stores
> 28.16 +2.2 30.35 ± 2% perf-stat.iTLB-load-miss-rate%
> 2.56e+08 -10.4% 2.295e+08 perf-stat.iTLB-loads
> 8.974e+12 -9.2% 8.151e+12 perf-stat.instructions
> 89411 -8.8% 81529 perf-stat.instructions-per-iTLB-miss
> 0.54 -8.8% 0.49 perf-stat.ipc
> 5.748e+08 -16.4% 4.806e+08 perf-stat.major-faults
> 52.82 +5.8 58.61 ± 2% perf-stat.node-load-miss-rate%
> 7.206e+09 ± 2% -18.6% 5.867e+09 ± 3% perf-stat.node-loads
> 17.96 ± 8% +15.7 33.69 ± 2% perf-stat.node-store-miss-rate%
> 2.055e+09 ± 8% +65.1% 3.393e+09 ± 4% perf-stat.node-store-misses
> 9.391e+09 ± 2% -28.9% 6.675e+09 perf-stat.node-stores
> 5.753e+08 -16.4% 4.811e+08 perf-stat.page-faults
> 305865 -16.3% 256108 proc-vmstat.allocstall_movable
> 1923 ± 14% -72.1% 537.00 ± 12% proc-vmstat.allocstall_normal
> 0.00 +Inf% 1577 ± 67% proc-vmstat.compact_isolated
> 1005 ± 4% -65.8% 344.00 ± 7% proc-vmstat.kswapd_low_wmark_hit_quickly
> 320062 +23.2% 394374 ± 4% proc-vmstat.nr_active_file
> 6411 ± 2% -76.4% 1511 ± 4% proc-vmstat.nr_free_cma
> 277.00 ± 12% -51.4% 134.75 ± 52% proc-vmstat.nr_vmscan_immediate_reclaim
> 320049 +23.2% 394353 ± 4% proc-vmstat.nr_zone_active_file
> 71262212 ± 15% +110.3% 1.499e+08 ± 3% proc-vmstat.numa_foreign
> 5.042e+08 ± 2% -34.3% 3.314e+08 proc-vmstat.numa_hit
> 5.041e+08 ± 2% -34.3% 3.314e+08 proc-vmstat.numa_local
> 71262212 ± 15% +110.3% 1.499e+08 ± 3% proc-vmstat.numa_miss
> 71273176 ± 15% +110.3% 1.499e+08 ± 3% proc-vmstat.numa_other
> 1007 ± 4% -65.6% 346.25 ± 7% proc-vmstat.pageoutrun
> 23070268 -16.0% 19386190 proc-vmstat.pgalloc_dma32
> 5.525e+08 -16.7% 4.603e+08 proc-vmstat.pgalloc_normal
> 5.753e+08 -16.4% 4.812e+08 proc-vmstat.pgfault
> 5.751e+08 -16.3% 4.813e+08 proc-vmstat.pgfree
> 5.748e+08 -16.4% 4.806e+08 proc-vmstat.pgmajfault
> 2.299e+09 -16.4% 1.923e+09 proc-vmstat.pgpgin
> 8.396e+08 -17.8% 6.901e+08 proc-vmstat.pgscan_direct
> 3.018e+08 ± 2% -13.0% 2.627e+08 proc-vmstat.pgscan_kswapd
> 4.1e+08 -15.1% 3.48e+08 proc-vmstat.pgsteal_direct
> 1.542e+08 ± 3% -20.9% 1.22e+08 ± 3% proc-vmstat.pgsteal_kswapd
> 23514 ± 4% -23.1% 18076 ± 16% proc-vmstat.slabs_scanned
> 343040 ± 2% +40.3% 481253 ± 2% proc-vmstat.workingset_activate
> 2.525e+08 -20.1% 2.018e+08 proc-vmstat.workingset_refault
> 13.64 ± 3% -1.7 11.96 ± 2% perf-profile.calltrace.cycles-pp.ext4_mpage_readpages.filemap_fault.ext4_filemap_fault.__do_fault.__handle_mm_fault
> 11.67 ± 3% -1.4 10.29 ± 2% perf-profile.calltrace.cycles-pp.submit_bio.ext4_mpage_readpages.filemap_fault.ext4_filemap_fault.__do_fault
> 11.64 ± 3% -1.4 10.25 ± 2% perf-profile.calltrace.cycles-pp.generic_make_request.submit_bio.ext4_mpage_readpages.filemap_fault.ext4_filemap_fault
> 11.10 ± 3% -1.3 9.82 ± 2% perf-profile.calltrace.cycles-pp.pmem_make_request.generic_make_request.submit_bio.ext4_mpage_readpages.filemap_fault
> 9.21 ± 3% -1.2 8.04 ± 3% perf-profile.calltrace.cycles-pp.pmem_do_bvec.pmem_make_request.generic_make_request.submit_bio.ext4_mpage_readpages
> 27.33 ± 4% -1.0 26.35 ± 5% perf-profile.calltrace.cycles-pp.cpu_startup_entry.start_secondary.secondary_startup_64
> 27.33 ± 4% -1.0 26.35 ± 5% perf-profile.calltrace.cycles-pp.do_idle.cpu_startup_entry.start_secondary.secondary_startup_64
> 27.33 ± 4% -1.0 26.35 ± 5% perf-profile.calltrace.cycles-pp.cpuidle_enter_state.do_idle.cpu_startup_entry.start_secondary.secondary_startup_64
> 27.33 ± 4% -1.0 26.35 ± 5% perf-profile.calltrace.cycles-pp.start_secondary.secondary_startup_64
> 26.79 ± 4% -0.8 25.98 ± 5% perf-profile.calltrace.cycles-pp.intel_idle.cpuidle_enter_state.do_idle.cpu_startup_entry.start_secondary
> 27.98 ± 3% -0.8 27.22 ± 4% perf-profile.calltrace.cycles-pp.secondary_startup_64
> 5.36 ± 12% -0.6 4.76 ± 7% perf-profile.calltrace.cycles-pp.kswapd.kthread.ret_from_fork
> 5.36 ± 12% -0.6 4.76 ± 7% perf-profile.calltrace.cycles-pp.shrink_node.kswapd.kthread.ret_from_fork
> 5.30 ± 12% -0.6 4.71 ± 7% perf-profile.calltrace.cycles-pp.shrink_inactive_list.shrink_node_memcg.shrink_node.kswapd.kthread
> 5.35 ± 12% -0.6 4.76 ± 7% perf-profile.calltrace.cycles-pp.shrink_node_memcg.shrink_node.kswapd.kthread.ret_from_fork
> 5.43 ± 12% -0.5 4.88 ± 7% perf-profile.calltrace.cycles-pp.ret_from_fork
> 5.43 ± 12% -0.5 4.88 ± 7% perf-profile.calltrace.cycles-pp.kthread.ret_from_fork
> 11.04 ± 2% -0.2 10.82 ± 2% perf-profile.calltrace.cycles-pp.shrink_page_list.shrink_inactive_list.shrink_node_memcg.shrink_node.do_try_to_free_pages
> 62.44 ± 2% +1.9 64.38 perf-profile.calltrace.cycles-pp.page_fault
> 62.38 ± 2% +2.0 64.33 perf-profile.calltrace.cycles-pp.__do_page_fault.do_page_fault.page_fault
> 62.38 ± 2% +2.0 64.34 perf-profile.calltrace.cycles-pp.do_page_fault.page_fault
> 61.52 ± 2% +2.1 63.58 perf-profile.calltrace.cycles-pp.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
> 61.34 ± 2% +2.1 63.44 perf-profile.calltrace.cycles-pp.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
> 30.18 ± 3% +2.3 32.45 ± 2% perf-profile.calltrace.cycles-pp.shrink_inactive_list.shrink_node_memcg.shrink_node.do_try_to_free_pages.try_to_free_pages
> 7.98 ± 3% +2.3 10.33 ± 2% perf-profile.calltrace.cycles-pp.add_to_page_cache_lru.filemap_fault.ext4_filemap_fault.__do_fault.__handle_mm_fault
> 30.48 ± 3% +2.4 32.83 ± 2% perf-profile.calltrace.cycles-pp.try_to_free_pages.__alloc_pages_slowpath.__alloc_pages_nodemask.filemap_fault.ext4_filemap_fault
> 30.46 ± 3% +2.4 32.81 ± 2% perf-profile.calltrace.cycles-pp.do_try_to_free_pages.try_to_free_pages.__alloc_pages_slowpath.__alloc_pages_nodemask.filemap_fault
> 30.46 ± 3% +2.4 32.81 ± 2% perf-profile.calltrace.cycles-pp.shrink_node.do_try_to_free_pages.try_to_free_pages.__alloc_pages_slowpath.__alloc_pages_nodemask
> 30.37 ± 3% +2.4 32.75 ± 2% perf-profile.calltrace.cycles-pp.shrink_node_memcg.shrink_node.do_try_to_free_pages.try_to_free_pages.__alloc_pages_slowpath
> 5.58 ± 4% +2.5 8.08 ± 2% perf-profile.calltrace.cycles-pp.__lru_cache_add.add_to_page_cache_lru.filemap_fault.ext4_filemap_fault.__do_fault
> 32.88 ± 3% +2.5 35.38 ± 2% perf-profile.calltrace.cycles-pp.__alloc_pages_nodemask.filemap_fault.ext4_filemap_fault.__do_fault.__handle_mm_fault
> 5.51 ± 4% +2.5 8.02 ± 2% perf-profile.calltrace.cycles-pp.pagevec_lru_move_fn.__lru_cache_add.add_to_page_cache_lru.filemap_fault.ext4_filemap_fault
> 4.24 ± 4% +2.5 6.76 ± 2% perf-profile.calltrace.cycles-pp._raw_spin_lock_irqsave.pagevec_lru_move_fn.__lru_cache_add.add_to_page_cache_lru.filemap_fault
> 4.18 ± 4% +2.5 6.70 ± 2% perf-profile.calltrace.cycles-pp.native_queued_spin_lock_slowpath._raw_spin_lock_irqsave.pagevec_lru_move_fn.__lru_cache_add.add_to_page_cache_lru
> 18.64 ± 3% +2.5 21.16 ± 2% perf-profile.calltrace.cycles-pp.native_queued_spin_lock_slowpath._raw_spin_lock_irq.shrink_inactive_list.shrink_node_memcg.shrink_node
> 31.65 ± 3% +2.7 34.31 ± 2% perf-profile.calltrace.cycles-pp.__alloc_pages_slowpath.__alloc_pages_nodemask.filemap_fault.ext4_filemap_fault.__do_fault
> 17.21 ± 3% +2.7 19.93 ± 2% perf-profile.calltrace.cycles-pp._raw_spin_lock_irq.shrink_inactive_list.shrink_node_memcg.shrink_node.do_try_to_free_pages

It looks like there is more lru lock contention. It would be caused by
using a movable zone for the CMA memory by this patch. In this case,
reclaim for normal memory skips the lru page on the movable zone so needs
more time to find enough reclaim target pages. It would increase lru lock
holding time and then cause contention.

Could you give me another stat 'pgskip_XXX' in /proc/vmstat to confirm
my theory?

BTW, other stats for memory management looks better than before,
less nr_free_cma, less pgmajfault, less reclaim scan/steal.

Thanks.

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