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3ec34e5527
Following the fix for 9018 (Replace kmem_cache_reap_now() with
kmem_cache_reap_soon), the arc_reclaim_thread() no longer blocks
while reaping. However, the code is still confusing and error-prone,
because this thread has two responsibilities. We should instead
separate this into two threads each with their own responsibility:
1. keep `arc_size` under `arc_c`, by calling `arc_adjust()`, which
improves `arc_is_overflowing()`
2. keep enough free memory in the system, by calling
`arc_kmem_reap_now()` plus `arc_shrink()`, which improves
`arc_available_memory()`.
Furthermore, we can use the zthr infrastructure to separate the
"should we do something" from "do it" parts of the logic, and
normalize the start up / shut down of the threads.
Authored by: Brad Lewis <brad.lewis@delphix.com>
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: Serapheim Dimitropoulos <serapheim@delphix.com>
Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: Dan McDonald <danmcd@joyent.com>
Reviewed by: Tim Kordas <tim.kordas@joyent.com>
Reviewed by: Tim Chase <tim@chase2k.com>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: Brad Lewis <brad.lewis@delphix.com>
Signed-off-by: Brad Lewis <brad.lewis@delphix.com>
OpenZFS-issue: https://www.illumos.org/issues/9284
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/de753e34f9
Closes #8165
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/*
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* CDDL HEADER START
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*
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* This file and its contents are supplied under the terms of the
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* Common Development and Distribution License ("CDDL"), version 1.0.
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* You may only use this file in accordance with the terms of version
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* 1.0 of the CDDL.
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*
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* A full copy of the text of the CDDL should have accompanied this
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* source. A copy of the CDDL is also available via the Internet at
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* http://www.illumos.org/license/CDDL.
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2017 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_ZTHR_H
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#define _SYS_ZTHR_H
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typedef struct zthr zthr_t;
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typedef int (zthr_func_t)(void *, zthr_t *);
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typedef boolean_t (zthr_checkfunc_t)(void *, zthr_t *);
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struct zthr {
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kthread_t *zthr_thread;
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kmutex_t zthr_lock;
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kcondvar_t zthr_cv;
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boolean_t zthr_cancel;
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hrtime_t zthr_wait_time;
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zthr_checkfunc_t *zthr_checkfunc;
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zthr_func_t *zthr_func;
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void *zthr_arg;
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int zthr_rc;
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};
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extern zthr_t *zthr_create(zthr_checkfunc_t checkfunc,
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zthr_func_t *func, void *arg);
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extern zthr_t *zthr_create_timer(zthr_checkfunc_t *checkfunc,
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zthr_func_t *func, void *arg, hrtime_t nano_wait);
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extern void zthr_exit(zthr_t *t, int rc);
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extern void zthr_destroy(zthr_t *t);
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extern void zthr_wakeup(zthr_t *t);
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extern int zthr_cancel(zthr_t *t);
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extern void zthr_resume(zthr_t *t);
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extern boolean_t zthr_iscancelled(zthr_t *t);
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extern boolean_t zthr_isrunning(zthr_t *t);
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#endif /* _SYS_ZTHR_H */
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