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| H A D | arc.c | diff 314873 Tue Mar 07 18:34:34 MST 2017 jpaetzel MFC 313879 MVF: 313876 7504 kmem_reap hangs spa_sync and administrative tasks illumos/illumos-gate@405a5a0f5c3ab36cb76559467d1a62ba648bd809 https://github.com/illumos/illumos-gate/commit/405a5a0f5c3ab36cb76559467d1a62ba648bd80 https://www.illumos.org/issues/7504 We see long spa_sync(). We are waiting to hold dp_config_rwlock for writer. Some other thread holds dp_config_rwlock for reader, then calls arc_get_data_buf(), which finds that arc_is_overflowing()==B_TRUE. So it waits (while holding dp_config_rwlock for reader) for arc_reclaim_thread to signal arc_reclaim_waiters_cv. Before signaling, arc_reclaim_thread does arc_kmem_reap_now(), which takes ~seconds. Author: Matthew Ahrens <mahrens@delphix.com> Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Prakash Surya <prakash.surya@delphix.com> Approved by: Dan McDonald <danmcd@omniti.com> |
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