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To prevent taskq_member holding tq_lock and doing linear search, thus causing contention. We store the taskq pointer to which the thread belongs in tsd. This way taskq_member will not need to touch tq_lock, and tsd has per slot spinlock. So the contention should be reduced greatly. Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #500 Closes #504 Closes #505
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/*****************************************************************************\
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* Copyright (C) 2010 Lawrence Livermore National Security, LLC.
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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://zfsonlinux.org/>.
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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_TSD_H
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#define _SPL_TSD_H
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#include <sys/types.h>
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#define TSD_HASH_TABLE_BITS_DEFAULT 9
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#define TSD_KEYS_MAX 32768
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#define DTOR_PID (PID_MAX_LIMIT+1)
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#define PID_KEY (TSD_KEYS_MAX+1)
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typedef void (*dtor_func_t)(void *);
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extern int tsd_set(uint_t, void *);
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extern void *tsd_get(uint_t);
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extern void *tsd_get_by_thread(uint_t, kthread_t *);
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extern void tsd_create(uint_t *, dtor_func_t);
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extern void tsd_destroy(uint_t *);
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extern void tsd_exit(void);
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int spl_tsd_init(void);
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void spl_tsd_fini(void);
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#endif /* _SPL_TSD_H */
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