{"action":"created","comment":{"url":"https://api.github.com/repos/openzfs/openzfs/pulls/comments/167405247","pull_request_review_id":95628091,"id":167405247,"diff_hunk":"@@ -854,16 +858,18 @@ libzfs_mnttab_find(libzfs_handle_t *hdl, const char *fsname,\n \t\t\treturn (ENOENT);\n \t}\n \n+\t(void) mutex_lock(&hdl->libzfs_mnttab_cache_lock);\n \tif (avl_numnodes(&hdl->libzfs_mnttab_cache) == 0)\n \t\tlibzfs_mnttab_update(hdl);\n \n \tfind.mtn_mt.mnt_special = (char *)fsname;\n \tmtn = avl_find(&hdl->libzfs_mnttab_cache, &find, NULL);\n \tif (mtn) {\n \t\t*entry = mtn->mtn_mt;\n-\t\treturn (0);\n+\t\tret = 0;\n \t}\n-\treturn (ENOENT);\n+\t(void) mutex_unlock(&hdl->libzfs_mnttab_cache_lock);","path":"usr/src/lib/libzfs/common/libzfs_dataset.c","position":48,"original_position":48,"commit_id":"b3f4bdf804d187b4d17d6721d3b47c2e53685e07","original_commit_id":"b3f4bdf804d187b4d17d6721d3b47c2e53685e07","user":{"login":"rmustacc","id":613773,"avatar_url":"https://avatars2.githubusercontent.com/u/613773?v=4","gravatar_id":"","url":"https://api.github.com/users/rmustacc","html_url":"https://github.com/rmustacc","followers_url":"https://api.github.com/users/rmustacc/followers","following_url":"https://api.github.com/users/rmustacc/following{/other_user}","gists_url":"https://api.github.com/users/rmustacc/gists{/gist_id}","starred_url":"https://api.github.com/users/rmustacc/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rmustacc/subscriptions","organizations_url":"https://api.github.com/users/rmustacc/orgs","repos_url":"https://api.github.com/users/rmustacc/repos","events_url":"https://api.github.com/users/rmustacc/events{/privacy}","received_events_url":"https://api.github.com/users/rmustacc/received_events","type":"User","site_admin":false},"body":"Use mutex_exit(), the version in user land. It will do all the error checking and abort appropriately. Otherwise, you need to check the return value and blow up if it's non-zero so we abort on deadlock or unlocking a lock that we didn't own.","created_at":"2018-02-10T17:32:23Z","updated_at":"2018-02-10T17:37:52Z","html_url":"https://github.com/openzfs/openzfs/pull/536#discussion_r167405247","pull_request_url":"https://api.github.com/repos/openzfs/openzfs/pulls/536","author_association":"NONE","_links":{"self":{"href":"https://api.github.com/repos/openzfs/openzfs/pulls/comments/167405247"},"html":{"href":"https://github.com/openzfs/openzfs/pull/536#discussion_r167405247"},"pull_request":{"href":"https://api.github.com/repos/openzfs/openzfs/pulls/536"}}},"pull_request":{"url":"https://api.github.com/repos/openzfs/openzfs/pulls/536","id":167552896,"html_url":"https://github.com/openzfs/openzfs/pull/536","diff_url":"https://github.com/openzfs/openzfs/pull/536.diff","patch_url":"https://github.com/openzfs/openzfs/pull/536.patch","issue_url":"https://api.github.com/repos/openzfs/openzfs/issues/536","number":536,"state":"open","locked":false,"title":"8115 parallel zfs mount (v2)","user":{"login":"prakashsurya","id":658081,"avatar_url":"https://avatars3.githubusercontent.com/u/658081?v=4","gravatar_id":"","url":"https://api.github.com/users/prakashsurya","html_url":"https://github.com/prakashsurya","followers_url":"https://api.github.com/users/prakashsurya/followers","following_url":"https://api.github.com/users/prakashsurya/following{/other_user}","gists_url":"https://api.github.com/users/prakashsurya/gists{/gist_id}","starred_url":"https://api.github.com/users/prakashsurya/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/prakashsurya/subscriptions","organizations_url":"https://api.github.com/users/prakashsurya/orgs","repos_url":"https://api.github.com/users/prakashsurya/repos","events_url":"https://api.github.com/users/prakashsurya/events{/privacy}","received_events_url":"https://api.github.com/users/prakashsurya/received_events","type":"User","site_admin":false},"body":"Reviewed by: Matthew Ahrens mahrens@delphix.com\nReviewed by: Pavel Zakharov pavel.zakharov@delphix.com\nReviewed by: Brad Lewis <brad.lewis@delphix.com>\nReviewed by: George Wilson <george.wilson@delphix.com>\nReviewed by: Paul Dagnelie <pcd@delphix.com>\nReviewed by: Prashanth Sreenivasa <pks@delphix.com>\n\nOverview\n========\n\nIn analyzing the time it takes for a Delphix Engine to come up following\na planned or unplanned reboot, we've determined that the SMF service\n(filesystem/local) that's responsible for mounting all local filesystems\n(except for /) is responsible for a significant percentage of the boot\ntime. The longer it takes for the Delphix Engine to come up, the longer\nthe Delphix Engine is unavailable during these outages. For example, on\na Delphix Engine with roughly 3000 filesystems, we have the following\nbreakdown of \"filesystem/local\" start time for a sample of 74 reboots:\n\n    # NumSamples = 74; Min = 0.00; Max = 782.00\n    # Mean = 186.972973; Variance = 17853.891161; SD = 133.618454; Median 156.000000\n    # each * represents a count of 1\n        0.0000 -    78.2000 [    10]: **********\n       78.2000 -   156.4000 [    27]: ***************************\n      156.4000 -   234.6000 [    17]: *****************\n      234.6000 -   312.8000 [     8]: ********\n      312.8000 -   391.0000 [     8]: ********\n      391.0000 -   469.2000 [     1]: *\n      469.2000 -   547.4000 [     1]: *\n      547.4000 -   625.6000 [     1]: *\n      625.6000 -   703.8000 [     0]:\n      703.8000 -   782.0000 [     1]: *\n\nOn average, it takes over 3 minutes to mount local filesystems on that\nsystem. A sampling of 56 reboots on another system which has 9000+\nfilesystems is below:\n\n    # NumSamples = 56; Min = 0.00; Max = 1377.00\n    # Mean = 175.250000; Variance = 54092.223214; SD = 232.577349; Median 118.000000\n    # each * represents a count of 1\n        0.0000 -   137.7000 [    37]: *************************************\n      137.7000 -   275.4000 [    11]: ***********\n      275.4000 -   413.1000 [     4]: ****\n      413.1000 -   550.8000 [     1]: *\n      550.8000 -   688.5000 [     1]: *\n      688.5000 -   826.2000 [     0]:\n      826.2000 -   963.9000 [     0]:\n      963.9000 -  1101.6000 [     1]: *\n     1101.6000 -  1239.3000 [     0]:\n     1239.3000 -  1377.0000 [     1]: *\n\nMounting of filesystems in \"filesystem/local\" is done using `zfs mount -a`,\nwhich mounts each filesystems serially. The bottleneck for each mount is\nthe I/O done to load metadata for each filesystem. As such, mounting\nfilesystems using a parallel algorithm should be a big win, and bring down\nthe runtime of \"filesystem/local\"'s start method.\n\nPerformance Testing: System Configuration\n=========================================\n\nTo test and verify these changes impacted performance how we expected it\nto, we used a VM with:\n\n  - 8 vCPUs\n  - zpool with 10 10k-SAS disks\n  - filesystem hierarchy like so:\n\n        1 pool     2 groups  100 containers  2 timeflows    5 leaf datasets\n                               per group     per container  per timeflow\n        ===================================================================\n        test-pool-+-group-0-+-container-0-+---timeflow-0---+-ds-0\n                  |         |             |                +-ds-1\n                  |         |             |                +-ds-2\n                  |         |             |                +-ds-3\n                  |         |             |                +-ds-4\n                  |         |             |\n                  |         |             +---timeflow-1---+-ds-0\n                  |         |                              +-ds-1\n                  |         |                              +-ds-2\n                  |         |                              +-ds-3\n                  |         |                              +-ds-4\n                  |         |\n                  |         +-container-1-+---timeflow-0---+-ds-0\n                  |         |             |                +-ds-1\n                  |         |             |                +-ds-2\n                  |         |             |                +-ds-3\n                  |         |             |                +-ds-4\n                  |         |             |\n                  |         |             +---timeflow-1---+-ds-0\n                  |         |                              +-ds-1\n                  |         |                              +-ds-2\n                  |         |                              +-ds-3\n                  |         |                              +-ds-4\n                  |         + ...\n                  |         .\n                  |         .\n                  |\n                  +-group-1 ...\n\nThis makes for a total of 2603 filesystems:\n\n    pool + groups + containers + timeflows + leaves\n    1    + 2      + 2*100      + 2(2*100)  + 5(2(2*100)) = 2603 filesystems\n\nAdditionally, a 1MB file was created in each leaf dataset.\n\nBecause this filesystem heirarchy is not very deep, this lends itself\nwell to the new parallel mounting algorithm implemented.\n\nPerformance Testing: Methodology and Results\n============================================\n\nThe system described above was rebooted 10 times, and the duration of\nthe start method of \"filesystem/local\" was measured. Specifically, the\n\"zfs mount -va\" comamnd that it calls was instrumented to break down the\nphases of the mounting process into three buckets:\n\n  1. gathering the list of filesystems to mount (aka \"load\")\n  2. mounting all filesystems (aka \"mount\")\n  3. left-over time spent doing anything else (aka \"other\")\n\nThe results of these measurements is below:\n\n           | other (s) | load (s) | mount (s) |\n       ----+-----------+----------+-----------+\n    Before |    1.5    |    8.1   |    45.5   |\n       ----+-------+------+-------+-----------+\n     After |    1.7    |    7.9   |    2.1    |\n       ----+-----------+----------+-----------+\n\nIn summary, for this configuration, the filesystem/local SMF services\ngoes from taking an average of 55.1 seconds (+/- 1.0s) to an average of\n11.7 seconds (+/- 0.8s). The \"other\" and \"load\" times remain unchanged\n(unsurprising given that this project hasn't touched any code in those\nareas).\n\nThe big win comes in the \"mount\" phase, which reduces the time from\nroughly 45 seconds to 2 seconds; a 95% decrease in latency.\n\nUsing the same zpool as above, \"zpool import\" performance was also\ntested; the mounting done by \"zpool import\" now uses the same framework\nas \"zfs mount -a\". Performance improvement for this case is unsurprisingly\non par with the \"zfs mount -a\" improvement documented above.\n\nUpstream bugs: DLPX-46555, DLPX-49847, DLPX-49351, 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