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a4683487f9
In response to an async related regression James noted: "My theory is that this is an init problem: The assumption in a lot of our code is that async_synchronize_full() waits for everything ... even the domain specific async schedules, which isn't true." ...so make this assumption true. Each domain, including the default one, registers itself on a global domain list when work is scheduled. Once all entries complete it exits that list. Waiting for the list to be empty syncs all in-flight work across all domains. Domains can opt-out of global syncing if they are declared as exclusive ASYNC_DOMAIN_EXCLUSIVE(). All stack-based domains have been declared exclusive since the domain may go out of scope as soon as the last work item completes. Statically declared domains are mostly ok, but async_unregister_domain() is there to close any theoretical races with pending async_synchronize_full waiters at module removal time. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Arjan van de Ven <arjan@linux.intel.com> Reported-by: Meelis Roos <mroos@linux.ee> Reported-by: Eldad Zack <eldadzack@gmail.com> Tested-by: Eldad Zack <eldad@fogrefinery.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/*
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* async.h: Asynchronous function calls for boot performance
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*
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* (C) Copyright 2009 Intel Corporation
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* Author: Arjan van de Ven <arjan@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; version 2
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* of the License.
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*/
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#ifndef __ASYNC_H__
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#define __ASYNC_H__
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#include <linux/types.h>
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#include <linux/list.h>
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typedef u64 async_cookie_t;
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typedef void (async_func_ptr) (void *data, async_cookie_t cookie);
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struct async_domain {
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struct list_head node;
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struct list_head domain;
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int count;
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unsigned registered:1;
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};
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/*
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* domain participates in global async_synchronize_full
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*/
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#define ASYNC_DOMAIN(_name) \
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struct async_domain _name = { .node = LIST_HEAD_INIT(_name.node), \
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.domain = LIST_HEAD_INIT(_name.domain), \
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.count = 0, \
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.registered = 1 }
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/*
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* domain is free to go out of scope as soon as all pending work is
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* complete, this domain does not participate in async_synchronize_full
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*/
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#define ASYNC_DOMAIN_EXCLUSIVE(_name) \
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struct async_domain _name = { .node = LIST_HEAD_INIT(_name.node), \
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.domain = LIST_HEAD_INIT(_name.domain), \
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.count = 0, \
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.registered = 0 }
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extern async_cookie_t async_schedule(async_func_ptr *ptr, void *data);
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extern async_cookie_t async_schedule_domain(async_func_ptr *ptr, void *data,
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struct async_domain *domain);
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void async_unregister_domain(struct async_domain *domain);
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extern void async_synchronize_full(void);
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extern void async_synchronize_full_domain(struct async_domain *domain);
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extern void async_synchronize_cookie(async_cookie_t cookie);
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extern void async_synchronize_cookie_domain(async_cookie_t cookie,
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struct async_domain *domain);
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#endif
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