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f0d8bb26b4
Adds a task queue to receive tasks dispatched with TQ_FRONT. Worker threads pull tasks from this high priority queue before the default pending queue. Executing tasks out of FIFO order potentially breaks taskq_lowest_id() if we do not preserve the ordering of the work list by taskqid. Therefore, instead of always appending to the work list, we search for the appropriate place to insert a task. The common case is to append to the list, so we make this operation efficient by searching the work list in reverse order. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
107 lines
4.5 KiB
C
107 lines
4.5 KiB
C
/*****************************************************************************\
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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* For details, see <http://github.com/behlendorf/spl/>.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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\*****************************************************************************/
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#ifndef _SPL_TASKQ_H
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#define _SPL_TASKQ_H
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#include <linux/module.h>
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#include <linux/gfp.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/kthread.h>
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#include <sys/types.h>
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#include <sys/thread.h>
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#define TASKQ_NAMELEN 31
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#define TASKQ_PREPOPULATE 0x00000001
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#define TASKQ_CPR_SAFE 0x00000002
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#define TASKQ_DYNAMIC 0x00000004
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#define TASKQ_THREADS_CPU_PCT 0x00000008
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#define TASKQ_DC_BATCH 0x00000010
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typedef unsigned long taskqid_t;
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typedef void (task_func_t)(void *);
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/*
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* Flags for taskq_dispatch. TQ_SLEEP/TQ_NOSLEEP should be same as
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* KM_SLEEP/KM_NOSLEEP. TQ_NOQUEUE/TQ_NOALLOC are set particularly
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* large so as not to conflict with already used GFP_* defines.
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*/
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#define TQ_SLEEP KM_SLEEP
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#define TQ_NOSLEEP KM_NOSLEEP
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#define TQ_NOQUEUE 0x01000000
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#define TQ_NOALLOC 0x02000000
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#define TQ_NEW 0x04000000
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#define TQ_FRONT 0x08000000
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#define TQ_ACTIVE 0x80000000
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typedef struct taskq {
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spinlock_t tq_lock; /* protects taskq_t */
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unsigned long tq_lock_flags; /* interrupt state */
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struct task_struct **tq_threads; /* thread pointers */
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const char *tq_name; /* taskq name */
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int tq_nactive; /* # of active threads */
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int tq_nthreads; /* # of total threads */
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int tq_pri; /* priority */
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int tq_minalloc; /* min task_t pool size */
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int tq_maxalloc; /* max task_t pool size */
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int tq_nalloc; /* cur task_t pool size */
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uint_t tq_flags; /* flags */
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taskqid_t tq_next_id; /* next pend/work id */
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taskqid_t tq_lowest_id; /* lowest pend/work id */
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struct list_head tq_free_list; /* free task_t's */
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struct list_head tq_work_list; /* work task_t's */
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struct list_head tq_pend_list; /* pending task_t's */
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struct list_head tq_prio_list; /* priority pending task_t's */
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wait_queue_head_t tq_work_waitq; /* new work waitq */
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wait_queue_head_t tq_wait_waitq; /* wait waitq */
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} taskq_t;
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/* Global system-wide dynamic task queue available for all consumers */
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extern taskq_t *system_taskq;
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extern taskqid_t __taskq_dispatch(taskq_t *, task_func_t, void *, uint_t);
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extern taskq_t *__taskq_create(const char *, int, pri_t, int, int, uint_t);
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extern void __taskq_destroy(taskq_t *);
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extern void __taskq_wait_id(taskq_t *, taskqid_t);
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extern void __taskq_wait(taskq_t *);
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extern int __taskq_member(taskq_t *, void *);
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int spl_taskq_init(void);
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void spl_taskq_fini(void);
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#define taskq_member(tq, t) __taskq_member(tq, t)
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#define taskq_wait_id(tq, id) __taskq_wait_id(tq, id)
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#define taskq_wait(tq) __taskq_wait(tq)
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#define taskq_dispatch(tq, f, p, fl) __taskq_dispatch(tq, f, p, fl)
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#define taskq_create(n, th, p, mi, ma, fl) __taskq_create(n, th, p, mi, ma, fl)
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#define taskq_create_proc(n, th, p, mi, ma, pr, fl) \
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__taskq_create(n, th, p, mi, ma, fl)
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#define taskq_create_sysdc(n, th, mi, ma, pr, dc, fl) \
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__taskq_create(n, th, maxclsyspri, mi, ma, fl)
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#define taskq_destroy(tq) __taskq_destroy(tq)
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#endif /* _SPL_TASKQ_H */
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