{"action":"created","issue":{"url":"https://api.github.com/repos/zfsonlinux/zfs/issues/5400","repository_url":"https://api.github.com/repos/zfsonlinux/zfs","labels_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/5400/labels{/name}","comments_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/5400/comments","events_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/5400/events","html_url":"https://github.com/zfsonlinux/zfs/issues/5400","id":189341469,"number":5400,"title":"0.7.0-rc2 txg_sync spins 100% cpu in function ddt_get_dedup_histogram when low memory but i don't have dedup","user":{"login":"mailinglists35","id":2054302,"avatar_url":"https://avatars.githubusercontent.com/u/2054302?v=3","gravatar_id":"","url":"https://api.github.com/users/mailinglists35","html_url":"https://github.com/mailinglists35","followers_url":"https://api.github.com/users/mailinglists35/followers","following_url":"https://api.github.com/users/mailinglists35/following{/other_user}","gists_url":"https://api.github.com/users/mailinglists35/gists{/gist_id}","starred_url":"https://api.github.com/users/mailinglists35/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mailinglists35/subscriptions","organizations_url":"https://api.github.com/users/mailinglists35/orgs","repos_url":"https://api.github.com/users/mailinglists35/repos","events_url":"https://api.github.com/users/mailinglists35/events{/privacy}","received_events_url":"https://api.github.com/users/mailinglists35/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":{"url":"https://api.github.com/repos/zfsonlinux/zfs/milestones/11","html_url":"https://github.com/zfsonlinux/zfs/milestones/0.7.0","labels_url":"https://api.github.com/repos/zfsonlinux/zfs/milestones/11/labels","id":7013,"number":11,"title":"0.7.0","description":"ZFS on Linux v0.7.0 - Memory management\r\n\r\n","creator":{"login":"behlendorf","id":148917,"avatar_url":"https://avatars.githubusercontent.com/u/148917?v=3","gravatar_id":"","url":"https://api.github.com/users/behlendorf","html_url":"https://github.com/behlendorf","followers_url":"https://api.github.com/users/behlendorf/followers","following_url":"https://api.github.com/users/behlendorf/following{/other_user}","gists_url":"https://api.github.com/users/behlendorf/gists{/gist_id}","starred_url":"https://api.github.com/users/behlendorf/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/behlendorf/subscriptions","organizations_url":"https://api.github.com/users/behlendorf/orgs","repos_url":"https://api.github.com/users/behlendorf/repos","events_url":"https://api.github.com/users/behlendorf/events{/privacy}","received_events_url":"https://api.github.com/users/behlendorf/received_events","type":"User","site_admin":false},"open_issues":26,"closed_issues":318,"state":"open","created_at":"2011-05-03T17:38:46Z","updated_at":"2016-11-18T21:58:44Z","due_on":null,"closed_at":null},"comments":27,"created_at":"2016-11-15T09:34:01Z","updated_at":"2016-11-29T16:19:53Z","closed_at":null,"body":"100% cpu wouldn't bother me but when it occurs I cannot read/write data on the pool except zpool/zfs get commands\r\nperf top -p $pidof txg_sync shows this\r\n\r\n    Samples: 78K of event 'cycles:pp', Event count (approx.): 14287937665\r\n    Overhead  Shared O  Symbol\r\n      52.58%  [kernel]  [k] ddt_get_dedup_histogram\r\n       3.09%  [kernel]  [k] mutex_lock\r\n       2.76%  [kernel]  [k] osq_lock\r\n       2.69%  [kernel]  [k] mutex_spin_on_owner.isra.3\r\n       2.60%  [kernel]  [k] _raw_spin_lock\r\n       2.29%  [kernel]  [k] mutex_unlock\r\n       2.07%  [kernel]  [k] vdev_get_stats_ex_impl\r\n       1.51%  [kernel]  [k] ddt_histogram_stat\r\n       1.08%  [kernel]  [k] txg_sync_thread\r\n       1.01%  [kernel]  [k] zio_create\r\n       0.90%  [kernel]  [k] __kmalloc_node\r\n       0.77%  [kernel]  [k] spa_sync\r\n       0.76%  [kernel]  [k] __cv_broadcast\r\n       0.71%  [kernel]  [k] update_blocked_averages\r\n       0.68%  [kernel]  [k] kfree\r\n       0.62%  [kernel]  [k] zap_hash\r\n       0.62%  [kernel]  [k] ddt_sync\r\n       0.59%  [kernel]  [k] spa_config_enter\r\n       0.45%  [kernel]  [k] spa_config_exit\r\n       0.44%  [kernel]  [k] zio_done\r\n       0.43%  [kernel]  [k] __memset\r\n       0.43%  [kernel]  [k] dbuf_hash\r\n       0.40%  [kernel]  [k] __bitmap_weight\r\n       0.39%  [kernel]  [k] dbuf_find\r\n       0.38%  [kernel]  [k] _raw_spin_lock_irqsave\r\n       0.35%  [kernel]  [k] perf_pmu_sched_task\r\n       0.33%  [kernel]  [k] zio_wait\r\n       0.32%  [kernel]  [k] kmem_cache_alloc\r\n       0.31%  [kernel]  [k] down_read\r\n       0.30%  [kernel]  [k] zap_leaf_lookup\r\n       0.29%  [kernel]  [k] _cond_resched\r\n       0.28%  [kernel]  [k] dsl_scan_active\r\n       0.27%  [kernel]  [k] zio_wait_for_children\r\n       0.27%  [kernel]  [k] zrl_add\r\n       0.26%  [kernel]  [k] spl_kmem_cache_alloc\r\n       0.26%  [kernel]  [k] __dbuf_hold_impl\r\n\r\n\r\n\r\n    --------------------- cache -------------------------------------------------------  ----- slab ------  ---- object -----  --- emergency ---\r\n    name                                    flags      size     alloc slabsize  objsize  total alloc   max  total alloc   max  dlock alloc   max\r\n    spl_vn_cache                          0x00020      8192       104     8192      104      1     1     7     42     1   256      0     0     0\r\n    spl_vn_file_cache                     0x00020      8192       112     8192      112      1     1     7     42     1   256      0     0     0\r\n    spl_zlib_workspace_cache              0x00240         0         0  2145216   268104      0     0     0      0     0     0      0     0     0\r\n    ddt_cache                             0x00040    398464    347984   199232    24856      2     2     6     16    14    48      0     0     0\r\n    zio_buf_20480                         0x00042         0         0   200704    20480      0     0    18      0     0   144      0     0     0\r\n    zio_data_buf_20480                    0x00042   1806336   1474560   200704    20480      9     9    51     72    72   408      0     0     0\r\n    zio_buf_24576                         0x00042         0         0   233472    24576      0     0    19      0     0   152      0     0     0\r\n    zio_data_buf_24576                    0x00042    466944     98304   233472    24576      2     2    59     16     4   472      0     0     0\r\n    zio_buf_28672                         0x00042         0         0   266240    28672      0     0    26      0     0   208      0     0     0\r\n    zio_data_buf_28672                    0x00042   1863680    716800   266240    28672      7     7    58     56    25   464      0     0     0\r\n    zio_buf_32768                         0x00042   1196032   1048576   299008    32768      4     4    49     32    32   392      0     0     0\r\n    zio_data_buf_32768                    0x00042   2093056   1605632   299008    32768      7     7    38     56    49   304      0     0     0\r\n    zio_buf_40960                         0x00042         0         0   364544    40960      0     0    19      0     0   152      0     0     0\r\n    zio_data_buf_40960                    0x00042   3645440   2662400   364544    40960     10    10    87     80    65   696      0     0     0\r\n    zio_buf_49152                         0x00042         0         0   430080    49152      0     0    12      0     0    96      0     0     0\r\n    zio_data_buf_49152                    0x00042   3440640   2850816   430080    49152      8     8   122     64    58   976      0     0     0\r\n    zio_buf_57344                         0x00042         0         0   495616    57344      0     0     9      0     0    72      0     0     0\r\n    zio_data_buf_57344                    0x00042   3469312   1949696   495616    57344      7     7   124     56    34   992      0     0     0\r\n    zio_buf_65536                         0x00042         0         0   561152    65536      0     0     7      0     0    56      0     0     0\r\n    zio_data_buf_65536                    0x00042   2805760   1507328   561152    65536      5     5   154     40    23  1232      0     0     0\r\n    zio_buf_81920                         0x00042         0         0   692224    81920      0     0    14      0     0   112      0     0     0\r\n    zio_data_buf_81920                    0x00042  10383360   7372800   692224    81920     15    15   133    120    90  1064      0     0     0\r\n    zio_buf_98304                         0x00042         0         0   823296    98304      0     0    11      0     0    88      0     0     0\r\n    zio_data_buf_98304                    0x00042  13172736   9928704   823296    98304     16    16   142    128   101  1136      0     0     0\r\n    zio_buf_114688                        0x00042         0         0   954368   114688      0     0     9      0     0    72      0     0     0\r\n    zio_data_buf_114688                   0x00042   6680576   5619712   954368   114688      7     7    34     56    49   272      0     0     0\r\n    zio_buf_131072                        0x00042 142192640 133562368  1085440   131072    131   131   182   1048  1019  1456      0     0     0\r\n    zio_data_buf_131072                   0x00042  97689600  85721088  1085440   131072     90    90   241    720   654  1928      0     0     0\r\n    zio_buf_163840                        0x00042         0         0  1347584   163840      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_163840                   0x00042         0         0  1347584   163840      0     0     0      0     0     0      0     0     0\r\n    zio_buf_196608                        0x00042         0         0  1609728   196608      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_196608                   0x00042         0         0  1609728   196608      0     0     0      0     0     0      0     0     0\r\n    zio_buf_229376                        0x00042         0         0  1871872   229376      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_229376                   0x00042         0         0  1871872   229376      0     0     0      0     0     0      0     0     0\r\n    zio_buf_262144                        0x00042         0         0  2134016   262144      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_262144                   0x00042         0         0  2134016   262144      0     0     0      0     0     0      0     0     0\r\n    zio_buf_327680                        0x00042         0         0  2658304   327680      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_327680                   0x00042         0         0  2658304   327680      0     0     0      0     0     0      0     0     0\r\n    zio_buf_393216                        0x00042         0         0  3182592   393216      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_393216                   0x00042         0         0  3182592   393216      0     0     0      0     0     0      0     0     0\r\n    zio_buf_458752                        0x00042         0         0  3706880   458752      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_458752                   0x00042         0         0  3706880   458752      0     0     0      0     0     0      0     0     0\r\n    zio_buf_524288                        0x00042         0         0  4231168   524288      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_524288                   0x00042         0         0  4231168   524288      0     0     0      0     0     0      0     0     0\r\n    zio_buf_655360                        0x00042         0         0  5279744   655360      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_655360                   0x00042         0         0  5279744   655360      0     0     0      0     0     0      0     0     0\r\n    zio_buf_786432                        0x00042         0         0  6328320   786432      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_786432                   0x00042         0         0  6328320   786432      0     0     0      0     0     0      0     0     0\r\n    zio_buf_917504                        0x00042         0         0  7376896   917504      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_917504                   0x00042         0         0  7376896   917504      0     0     0      0     0     0      0     0     0\r\n    zio_buf_1048576                       0x00042         0         0  8425472  1048576      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_1048576                  0x00042         0         0  8425472  1048576      0     0     0      0     0     0      0     0     0\r\n    zio_buf_1310720                       0x00042         0         0 10522624  1310720      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_1310720                  0x00042         0         0 10522624  1310720      0     0     0      0     0     0      0     0     0\r\n    zio_buf_1572864                       0x00042         0         0 12619776  1572864      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_1572864                  0x00042         0         0 12619776  1572864      0     0     0      0     0     0      0     0     0\r\n    zio_buf_1835008                       0x00042         0         0 14716928  1835008      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_1835008                  0x00042         0         0 14716928  1835008      0     0     0      0     0     0      0     0     0\r\n    zio_buf_2097152                       0x00042         0         0 16814080  2097152      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_2097152                  0x00042         0         0 16814080  2097152      0     0     0      0     0     0      0     0     0\r\n    zio_buf_2621440                       0x00042         0         0 21008384  2621440      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_2621440                  0x00042         0         0 21008384  2621440      0     0     0      0     0     0      0     0     0\r\n    zio_buf_3145728                       0x00042         0         0 25202688  3145728      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_3145728                  0x00042         0         0 25202688  3145728      0     0     0      0     0     0      0     0     0\r\n    zio_buf_3670016                       0x00042         0         0 29396992  3670016      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_3670016                  0x00042         0         0 29396992  3670016      0     0     0      0     0     0      0     0     0\r\n    zio_buf_4194304                       0x00042         0         0 29392896  4194304      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_4194304                  0x00042         0         0 29392896  4194304      0     0     0      0     0     0      0     0     0\r\n    zio_buf_5242880                       0x00042         0         0 31485952  5242880      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_5242880                  0x00042         0         0 31485952  5242880      0     0     0      0     0     0      0     0     0\r\n    zio_buf_6291456                       0x00042         0         0 31481856  6291456      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_6291456                  0x00042         0         0 31481856  6291456      0     0     0      0     0     0      0     0     0\r\n    zio_buf_7340032                       0x00042         0         0 29380608  7340032      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_7340032                  0x00042         0         0 29380608  7340032      0     0     0      0     0     0      0     0     0\r\n    zio_buf_8388608                       0x00042         0         0 25182208  8388608      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_8388608                  0x00042         0         0 25182208  8388608      0     0     0      0     0     0      0     0     0\r\n    zio_buf_10485760                      0x00042         0         0 31473664 10485760      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_10485760                 0x00042         0         0 31473664 10485760      0     0     0      0     0     0      0     0     0\r\n    zio_buf_12582912                      0x00042         0         0 25178112 12582912      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_12582912                 0x00042         0         0 25178112 12582912      0     0     0      0     0     0      0     0     0\r\n    zio_buf_14680064                      0x00042         0         0 29372416 14680064      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_14680064                 0x00042         0         0 29372416 14680064      0     0     0      0     0     0      0     0     0\r\n    zio_buf_16777216                      0x00042         0         0 16785408 16777216      0     0     0      0     0     0      0     0     0\r\n    zio_data_buf_16777216                 0x00042         0         0 16785408 16777216      0     0     0      0     0     0      0     0     0\r\n\r\n    ------------------------------------------------------------------------\r\n    ZFS Subsystem Report                                Tue Nov 15 11:31:23 2016\r\n    ARC Summary: (HEALTHY)\r\n        Memory Throttle Count:                  0\r\n\r\n    ARC Misc:\r\n        Deleted:                                271.60k\r\n        Mutex Misses:                           61.75k\r\n        Evict Skips:                            61.75k\r\n\r\n    ARC Size:                           27.50%  1.05    GiB\r\n        Target Size: (Adaptive)         0.82%   32.00   MiB\r\n        Min Size (Hard Limit):          0.82%   32.00   MiB\r\n        Max Size (High Water):          122:1   3.83    GiB\r\n\r\n    ARC Size Breakdown:\r\n        Recently Used Cache Size:       0.07%   760.33  KiB\r\n        Frequently Used Cache Size:     99.93%  1.05    GiB\r\n\r\n    ARC Hash Breakdown:\r\n        Elements Max:                           108.59k\r\n        Elements Current:               33.89%  36.80k\r\n        Collisions:                             101.37k\r\n        Chain Max:                              4\r\n        Chains:                                 597\r\n\r\n    ARC Total accesses:                                 3.61m\r\n        Cache Hit Ratio:                38.37%  1.39m\r\n        Cache Miss Ratio:               61.63%  2.23m\r\n        Actual Hit Ratio:               37.28%  1.35m\r\n\r\n        Data Demand Efficiency:         57.94%  1.73m\r\n        Data Prefetch Efficiency:       85.80%  65.33k\r\n\r\n        CACHE HITS BY CACHE LIST:\r\n          Most Recently Used:           4.17%   57.79k\r\n          Most Frequently Used:         92.97%  1.29m\r\n          Most Recently Used Ghost:     4.10%   56.89k\r\n          Most Frequently Used Ghost:   37.25%  516.42k\r\n\r\n        CACHE HITS BY DATA TYPE:\r\n          Demand Data:                  72.32%  1.00m\r\n          Prefetch Data:                4.04%   56.06k\r\n          Demand Metadata:              21.98%  304.73k\r\n          Prefetch Metadata:            1.65%   22.93k\r\n\r\n        CACHE MISSES BY DATA TYPE:\r\n          Demand Data:                  32.69%  727.80k\r\n          Prefetch Data:                0.42%   9.28k\r\n          Demand Metadata:              65.67%  1.46m\r\n          Prefetch Metadata:            1.22%   27.25k\r\n\r\n\r\n    MemTotal:        8030788 kB\r\n    MemFree:          160124 kB\r\n    MemAvailable:    1007232 kB\r\n    Buffers:            8128 kB\r\n    Cached:           809028 kB\r\n    SwapCached:       106308 kB\r\n    Active:           934544 kB\r\n    Inactive:         968884 kB\r\n    Active(anon):     486436 kB\r\n    Inactive(anon):   615180 kB\r\n    Active(file):     448108 kB\r\n    Inactive(file):   353704 kB\r\n    Unevictable:       18076 kB\r\n    Mlocked:           18076 kB\r\n    SwapTotal:       8388604 kB\r\n    SwapFree:        5709976 kB\r\n    Dirty:                24 kB\r\n    Writeback:             0 kB\r\n    AnonPages:       1089000 kB\r\n    Mapped:           730832 kB\r\n    Shmem:             11324 kB\r\n    Slab:            3311688 kB\r\n    SReclaimable:     351260 kB\r\n    SUnreclaim:      2960428 kB\r\n    KernelStack:      247392 kB\r\n    PageTables:       406888 kB\r\n    NFS_Unstable:          0 kB\r\n    Bounce:                0 kB\r\n    WritebackTmp:          0 kB\r\n    CommitLimit:    12403996 kB\r\n    Committed_AS:   107995212 kB\r\n    VmallocTotal:   34359738367 kB\r\n    VmallocUsed:           0 kB\r\n    VmallocChunk:          0 kB\r\n    HardwareCorrupted:     0 kB\r\n    AnonHugePages:      6144 kB\r\n    CmaTotal:              0 kB\r\n    CmaFree:               0 kB\r\n    HugePages_Total:       0\r\n    HugePages_Free:        0\r\n    HugePages_Rsvd:        0\r\n    HugePages_Surp:        0\r\n    Hugepagesize:       2048 kB\r\n    DirectMap4k:     5554788 kB\r\n    DirectMap2M:     2824192 kB\r\n\r\n\r\n    11 1 0x01 92 4416 15200916354 328514879975550\r\n    name                            type data\r\n    hits                            4    1386443\r\n    misses                          4    2226447\r\n    demand_data_hits                4    1002735\r\n    demand_data_misses              4    727798\r\n    demand_metadata_hits            4    304727\r\n    demand_metadata_misses          4    1462123\r\n    prefetch_data_hits              4    56056\r\n    prefetch_data_misses            4    9279\r\n    prefetch_metadata_hits          4    22925\r\n    prefetch_metadata_misses        4    27247\r\n    mru_hits                        4    57790\r\n    mru_ghost_hits                  4    56888\r\n    mfu_hits                        4    1288948\r\n    mfu_ghost_hits                  4    516425\r\n    deleted                         4    271603\r\n    mutex_miss                      4    61753\r\n    evict_skip                      4    20788228\r\n    evict_not_enough                4    2098855\r\n    evict_l2_cached                 4    0\r\n    evict_l2_eligible               4    7344444928\r\n    evict_l2_ineligible             4    877400064\r\n    evict_l2_skip                   4    0\r\n    hash_elements                   4    36798\r\n    hash_elements_max               4    108593\r\n    hash_collisions                 4    101371\r\n    hash_chains                     4    597\r\n    hash_chain_max                  4    4\r\n    p                               4    778576\r\n    c                               4    33554432\r\n    c_min                           4    33554432\r\n    c_max                           4    4111763456\r\n    size                            4    1130913888\r\n    compressed_size                 4    116959232\r\n    uncompressed_size               4    693078016\r\n    overhead_size                   4    751551488\r\n    hdr_size                        4    15365744\r\n    data_size                       4    100401152\r\n    metadata_size                   4    768109568\r\n    dbuf_size                       4    57442624\r\n    dnode_size                      4    140587440\r\n    bonus_size                      4    49007360\r\n    anon_size                       4    134647296\r\n    anon_evictable_data             4    0\r\n    anon_evictable_metadata         4    0\r\n    mru_size                        4    624236032\r\n    mru_evictable_data              4    0\r\n    mru_evictable_metadata          4    0\r\n    mru_ghost_size                  4    0\r\n    mru_ghost_evictable_data        4    0\r\n    mru_ghost_evictable_metadata    4    0\r\n    mfu_size                        4    109627392\r\n    mfu_evictable_data              4    0\r\n    mfu_evictable_metadata          4    0\r\n    mfu_ghost_size                  4    33501184\r\n    mfu_ghost_evictable_data        4    131072\r\n    mfu_ghost_evictable_metadata    4    33370112\r\n    l2_hits                         4    0\r\n    l2_misses                       4    0\r\n    l2_feeds                        4    0\r\n    l2_rw_clash                     4    0\r\n    l2_read_bytes                   4    0\r\n    l2_write_bytes                  4    0\r\n    l2_writes_sent                  4    0\r\n    l2_writes_done                  4    0\r\n    l2_writes_error                 4    0\r\n    l2_writes_lock_retry            4    0\r\n    l2_evict_lock_retry             4    0\r\n    l2_evict_reading                4    0\r\n    l2_evict_l1cached               4    0\r\n    l2_free_on_write                4    0\r\n    l2_abort_lowmem                 4    0\r\n    l2_cksum_bad                    4    0\r\n    l2_io_error                     4    0\r\n    l2_size                         4    0\r\n    l2_asize                        4    0\r\n    l2_hdr_size                     4    0\r\n    memory_throttle_count           4    0\r\n    memory_direct_count             4    6234\r\n    memory_indirect_count           4    21782\r\n    arc_no_grow                     4    0\r\n    arc_tempreserve                 4    0\r\n    arc_loaned_bytes                4    0\r\n    arc_prune                       4    171950\r\n    arc_meta_used                   4    1030512736\r\n    arc_meta_limit                  4    3083822592\r\n    arc_dnode_limit                 4    308382259\r\n    arc_meta_max                    4    1756537704\r\n    arc_meta_min                    4    16777216\r\n    sync_wait_for_async             4    299\r\n    demand_hit_predictive_prefetch  4    3832\r\n    arc_need_free                   4    0\r\n    arc_sys_free                    4    128491520\r\n\r\n\r\n\r\nsometimes it goes away after 3 > drop_caches (or maybe just a coincidence and gone away by itself), most other times i must reboot.\r\n"},"comment":{"url":"https://api.github.com/repos/zfsonlinux/zfs/issues/comments/263617748","html_url":"https://github.com/zfsonlinux/zfs/issues/5400#issuecomment-263617748","issue_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/5400","id":263617748,"user":{"login":"mailinglists35","id":2054302,"avatar_url":"https://avatars.githubusercontent.com/u/2054302?v=3","gravatar_id":"","url":"https://api.github.com/users/mailinglists35","html_url":"https://github.com/mailinglists35","followers_url":"https://api.github.com/users/mailinglists35/followers","following_url":"https://api.github.com/users/mailinglists35/following{/other_user}","gists_url":"https://api.github.com/users/mailinglists35/gists{/gist_id}","starred_url":"https://api.github.com/users/mailinglists35/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mailinglists35/subscriptions","organizations_url":"https://api.github.com/users/mailinglists35/orgs","repos_url":"https://api.github.com/users/mailinglists35/repos","events_url":"https://api.github.com/users/mailinglists35/events{/privacy}","received_events_url":"https://api.github.com/users/mailinglists35/received_events","type":"User","site_admin":false},"created_at":"2016-11-29T16:19:53Z","updated_at":"2016-11-29T16:19:53Z","body":"and expanded call path for txg_quiesce\r\n\r\n\r\n    -   18.52%     0.00%  txg_quiesce      [kernel.kallsyms]   [k] thread_generic_wrapper                         ▒\r\n       - thread_generic_wrapper                                                                                   ▒\r\n          - 16.88% txg_quiesce_thread                                                                             ▒\r\n             - 8.91% __cv_broadcast                                                                               ▒\r\n                - 8.80% __wake_up                                                                                 ▒\r\n                   - 8.53% __wake_up_common                                                                       ◆\r\n                      - 8.31% autoremove_wake_function                                                            ▒\r\n                         - 8.19% default_wake_function                                                            ▒\r\n                            - 8.10% try_to_wake_up                                                                ▒\r\n                               - 5.24% ttwu_do_activate.constprop.90                                              ▒\r\n                                  + 4.59% activate_task                                                           ▒\r\n                                  - 0.58% ttwu_do_wakeup                                                          ▒\r\n                                     - 0.52% check_preempt_curr                                                   ▒\r\n                                        - 0.36% check_preempt_wakeup                                              ▒\r\n                                           - 0.10% wakeup_preempt_entity.isra.55                                  ▒\r\n                                                __calc_delta                                                      ▒\r\n                                           - 0.04% update_curr                                                    ▒\r\n                                                cpuacct_charge                                                    ▒\r\n                                           - 0.02% resched_curr                                                   ▒\r\n                                              - 0.01% native_smp_send_reschedule                                  ▒\r\n                                                 - physflat_send_IPI_mask                                         ▒\r\n                                                 - default_send_IPI_mask_sequence_phys                            ▒\r\n                                                    - find_next_bit                                               ▒\r\n                                                      _find_next_bit.part.0                                       ▒\r\n                                                0.00% physflat_send_IPI_mask                                      ▒\r\n                                             0.01% __calc_delta                                                   ▒\r\n                                             0.00% set_next_buddy                                                 ▒\r\n                                          0.01% update_curr                                                       ▒\r\n                                          0.01% wakeup_preempt_entity.isra.55                                     ▒\r\n                                          0.00% resched_curr                                                      ▒\r\n                                       0.01% resched_curr                                                         ▒\r\n                                       0.01% check_preempt_wakeup                                                 ▒\r\n                                    0.01% enqueue_task_fair                                                       ▒\r\n                                    0.01% check_preempt_curr                                                      ▒\r\n                                    0.01% update_rq_clock.part.80                                                 ▒\r\n                               - 1.20% select_task_rq_fair                                                        ▒\r\n                                  - 0.92% select_idle_sibling                                                     ▒\r\n                                       0.15% idle_cpu                                                             ▒\r\n                                     - 0.11% find_next_bit                                                        ▒\r\n                                          _find_next_bit.part.0                                                   ▒\r\n                                       0.07% __bitmap_intersects                                                  ▒\r\n                                       0.07% _find_next_bit.part.0                                                ▒\r\n                                       0.00% cpumask_next_and                                                     ▒\r\n                                    0.06% find_next_bit                                                           ▒\r\n                                    0.05% idle_cpu                                                                ▒\r\n                                    0.05% __bitmap_intersects                                                     ▒\r\n                               - 0.55% _raw_spin_lock                                                             ▒\r\n                                    native_queued_spin_lock_slowpath                                              ▒\r\n                                 0.20% _raw_spin_lock_irqsave                                                     ▒\r\n                                 0.14% ttwu_stat                                                                  ▒\r\n                                 0.05% task_waking_fair                                                           ▒\r\n                                 0.04% _raw_spin_unlock_irqrestore                                                ▒\r\n                               - 0.01% ttwu_do_wakeup                                                             ▒\r\n                                  - check_preempt_curr                                                            ▒\r\n                                    check_preempt_wakeup                                                          ▒\r\n                                 0.01% select_idle_sibling                                                        ▒\r\n                                 0.01% activate_task                                                              ▒\r\n                                 0.00% native_queued_spin_lock_slowpath                                           ▒\r\n                               - 0.00% set_task_cpu                                                               ▒\r\n                                  - migrate_task_rq_fair                                                          ▒\r\n                                    remove_entity_load_avg                                                        ▒\r\n                              0.02% ttwu_stat                                                                     ▒\r\n                              0.02% _raw_spin_unlock_irqrestore                                                   ▒\r\n                              0.01% task_waking_fair                                                              ▒\r\n                              0.01% ttwu_do_activate.constprop.90                                                 ▒\r\n                              0.01% _raw_spin_lock                                                                ▒\r\n                              0.01% select_task_rq_fair                                                           ▒\r\n                              0.00% _raw_spin_lock_irqsave                                                        ▒\r\n                              0.00% set_task_cpu                                                                  ▒\r\n                           0.00% try_to_wake_up                                                                   ▒\r\n                        0.01% default_wake_function                                                               ▒\r\n                   - 0.20% apic_timer_interrupt                                                                   ▒\r\n                      - smp_apic_timer_interrupt                                                                  ▒\r\n                         - 0.20% irq_exit                                                                         ▒\r\n                            - __do_softirq                                                                        ▒\r\n                               - 0.19% run_rebalance_domains                                                      ▒\r\n                                  - rebalance_domains                                                             ▒\r\n                                       0.19% update_blocked_averages                                              ▒\r\n                                       0.00% __compute_runnable_contrib                                           ▒\r\n                                     - 0.00% load_balance                                                         ▒\r\n                                          deactivate_task                                                         ▒\r\n                                          dequeue_task_fair                                                       ▒\r\n                                          dequeue_entity                                                          ▒\r\n                                 0.00% cpu_needs_another_gp                                                       ▒\r\n                         - 0.00% local_apic_timer_interrupt                                                       ▒\r\n                            - hrtimer_interrupt                                                                   ▒\r\n                               - __hrtimer_run_queues                                                             ▒\r\n                                  - 0.00% tick_sched_timer                                                        ▒\r\n                                       tick_sched_handle.isra.14                                                  ▒\r\n                                     - update_process_times                                                       ▒\r\n                                          0.00% rcu_check_callbacks                                               ▒\r\n                                          0.00% _raw_spin_lock                                                    ▒\r\n                                  - 0.00% hrtimer_wakeup                                                          ▒\r\n                                       wake_up_process                                                            ▒\r\n                                       try_to_wake_up                                                             ▒\r\n                                       _raw_spin_lock_irqsave                                                     ▒\r\n                     0.05% _raw_spin_lock_irqsave                                                                 ▒\r\n                     0.01% _raw_spin_unlock_irqrestore                                                            ▒\r\n                     0.01% autoremove_wake_function                                                               ▒\r\n                   + 0.01% ret_from_intr                                                                          ▒\r\n                  0.00% __wake_up_common                                                                          ▒\r\n                  0.00% _raw_spin_unlock_irqrestore                                                               ▒\r\n             - 2.20% __cv_wait_sig                                                                                ▒\r\n                - 2.14% cv_wait_common                                                                            ▒\r\n                   - 0.88% schedule                                                                               ▒\r\n                      - 0.85% __schedule                                                                          ▒\r\n                         - 0.39% deactivate_task                                                                  ▒\r\n                            - 0.31% dequeue_task_fair                                                             ▒\r\n                               - 0.25% dequeue_entity                                                             ▒\r\n                                  - 0.07% update_curr                                                             ▒\r\n                                       0.02% cpuacct_charge                                                       ▒\r\n                                       0.01% update_min_vruntime                                                  ▒\r\n                                    0.03% account_entity_dequeue                                                  ▒\r\n                                    0.01% update_cfs_shares                                                       ▒\r\n                                    0.01% cpuacct_charge                                                          ▒\r\n                                    0.00% clear_buddies                                                           ▒\r\n                                    0.00% update_min_vruntime                                                     ▒\r\n                                 0.02% account_entity_dequeue                                                     ▒\r\n                                 0.01% clear_buddies                                                              ▒\r\n                                 0.00% update_min_vruntime                                                        ▒\r\n                                 0.00% update_curr                                                                ▒\r\n                                 0.00% update_cfs_shares                                                          ▒\r\n                            - 0.05% update_rq_clock.part.80                                                       ▒\r\n                               - sched_clock_cpu                                                                  ▒\r\n                                  - 0.01% sched_clock                                                             ▒\r\n                                       native_sched_clock                                                         ▒\r\n                                    0.00% native_sched_clock                                                      ▒\r\n                              0.00% dequeue_entity                                                                ▒\r\n                              0.00% hrtick_update                                                                 ▒\r\n                              0.00% sched_clock_cpu                                                               ▒\r\n                         + 0.08% pick_next_task_fair                                                              ▒\r\n                           0.06% finish_task_switch                                                               ▒\r\n                         + 0.03% _raw_spin_lock_irq                                                               ▒\r\n                         + 0.03% pick_next_task_idle                                                              ▒\r\n                           0.01% rcu_note_context_switch                                                          ▒\r\n                           0.01% dequeue_task_fair                                                                ▒\r\n                           0.01% __msecs_to_jiffies                                                               ▒\r\n                           0.00% update_rq_clock.part.80                                                          ▒\r\n                           0.00% put_prev_task_fair                                                               ▒\r\n                         + 0.00% ret_from_intr                                                                    ▒\r\n                         + 0.00% apic_timer_interrupt                                                             ▒\r\n                           0.00% update_curr                                                                      ▒\r\n                           0.00% check_cfs_rq_runtime                                                             ▒\r\n                         + 0.00% reschedule_interrupt                                                             ▒\r\n                        0.01% _raw_spin_lock_irq                                                                  ▒\r\n                        0.01% deactivate_task                                                                     ▒\r\n                        0.00% pick_next_task_idle                                                                 ▒\r\n                        0.00% pick_next_task_fair                                                                 ▒\r\n                        0.00% finish_task_switch                                                                  ▒\r\n                        0.00% rcu_note_context_switch                                                             ▒\r\n                      + 0.00% apic_timer_interrupt                                                                ▒\r\n                        0.00% update_rq_clock.part.80                                                             ▒\r\n                   + 0.62% mutex_lock                                                                             ▒\r\n                   + 0.15% mutex_unlock                                                                           ▒\r\n                   + 0.09% prepare_to_wait_exclusive                                                              ▒\r\n                   + 0.08% __wake_up                                                                              ▒\r\n                   + 0.01% finish_wait                                                                            ▒\r\n                     0.01% _raw_spin_unlock_irqrestore                                                            ▒\r\n                     0.01% __mutex_lock_slowpath                                                                  ▒\r\n                     0.00% __schedule                                                                             ▒\r\n                     0.00% __mutex_unlock_slowpath                                                                ▒\r\n                     0.00% _cond_resched                                                                          ▒\r\n                     0.00% _raw_spin_lock_irqsave                                                                 ▒\r\n                     0.00% __wake_up_common                                                                       ▒\r\n                   + 0.00% ret_from_intr                                                                          ▒\r\n                  0.04% mutex_unlock                                                                              ▒\r\n                  0.01% mutex_lock                                                                                ▒\r\n                + 0.01% apic_timer_interrupt                                                                      ▒\r\n                  0.00% schedule                                                                                  ▒\r\n                  0.00% prepare_to_wait_exclusive                                                                 ▒\r\n                  0.00% __wake_up                                                                                 ▒\r\n                  0.00% finish_wait                                                                               ▒\r\n             - 1.57% mutex_lock                                                                                   ▒\r\n                - 0.31% __mutex_lock_slowpath                                                                     ▒\r\n                   - 0.30% mutex_optimistic_spin                                                                  ▒\r\n                        0.15% mutex_spin_on_owner.isra.3                                                          ▒\r\n                        0.05% osq_lock                                                                            ▒\r\n                      - 0.01% apic_timer_interrupt                                                                ▒\r\n                         - smp_apic_timer_interrupt                                                               ▒\r\n                           irq_exit                                                                               ▒\r\n                           __do_softirq                                                                           ▒\r\n                           run_rebalance_domains                                                                  ▒\r\n                           rebalance_domains                                                                      ▒\r\n                           update_blocked_averages                                                                ▒\r\n                        0.01% osq_unlock                                                                          ▒\r\n                     0.00% mutex_spin_on_owner.isra.3                                                             ▒\r\n                     0.00% osq_lock                                                                               ▒\r\n                     0.00% osq_unlock                                                                             ▒\r\n                   + 0.00% schedule_preempt_disabled                                                              ▒\r\n                  0.00% mutex_optimistic_spin                                                                     ▒\r\n\r\n"}}
{"actor":{"display_login":"mailinglists35"}}