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OpenZFS 7504 - kmem_reap hangs spa_sync and administrative tasks

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Authored by: 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>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tim Chase <tim@chase2k.com>
Ported-by: George Melikov <mail@gmelikov.ru>

OpenZFS-issue: https://www.illumos.org/issues/7504
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/405a5a0
Closes #5736
This commit is contained in:
George Melikov 2017-02-04 20:21:25 +03:00 committed by Brian Behlendorf
parent 2e0e443ac4
commit 0a252daed3
1 changed files with 8 additions and 3 deletions
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11
module/zfs/arc.c
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@ -4193,7 +4193,6 @@ arc_reclaim_thread(void)
mutex_enter(&arc_reclaim_lock);
while (!arc_reclaim_thread_exit) {
int64_t to_free;
int64_t free_memory = arc_available_memory();
uint64_t evicted = 0;
arc_tuning_update();
@ -4215,6 +4214,14 @@ arc_reclaim_thread(void)
#endif
mutex_exit(&arc_reclaim_lock);
/*
* We call arc_adjust() before (possibly) calling
* arc_kmem_reap_now(), so that we can wake up
* arc_get_data_buf() sooner.
*/
evicted = arc_adjust();
int64_t free_memory = arc_available_memory();
if (free_memory < 0) {
arc_no_grow = B_TRUE;
@ -4247,8 +4254,6 @@ arc_reclaim_thread(void)
arc_no_grow = B_FALSE;
}
evicted = arc_adjust();
mutex_enter(&arc_reclaim_lock);
/*