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David Howells8fba10a2009-11-19 18:10:51 +00001/* Slow work private definitions
2 *
3 * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11
12#define SLOW_WORK_CULL_TIMEOUT (5 * HZ) /* cull threads 5s after running out of
13 * things to do */
14#define SLOW_WORK_OOM_TIMEOUT (5 * HZ) /* can't start new threads for 5s after
15 * OOM */
16
17#define SLOW_WORK_THREAD_LIMIT 255 /* abs maximum number of slow-work threads */
18
19/*
20 * slow-work.c
21 */
David Howellsf13a48b2009-12-01 15:36:11 +000022#ifdef CONFIG_SLOW_WORK_DEBUG
David Howells8fba10a2009-11-19 18:10:51 +000023extern struct slow_work *slow_work_execs[];
24extern pid_t slow_work_pids[];
25extern rwlock_t slow_work_execs_lock;
26#endif
27
28extern struct list_head slow_work_queue;
29extern struct list_head vslow_work_queue;
30extern spinlock_t slow_work_queue_lock;
31
32/*
David Howellsf13a48b2009-12-01 15:36:11 +000033 * slow-work-debugfs.c
David Howells8fba10a2009-11-19 18:10:51 +000034 */
David Howellsf13a48b2009-12-01 15:36:11 +000035#ifdef CONFIG_SLOW_WORK_DEBUG
David Howells8fba10a2009-11-19 18:10:51 +000036extern const struct file_operations slow_work_runqueue_fops;
37
38extern void slow_work_new_thread_desc(struct slow_work *, struct seq_file *);
39#endif
40
41/*
42 * Helper functions
43 */
44static inline void slow_work_set_thread_pid(int id, pid_t pid)
45{
David Howellsa53f4f92010-03-29 13:08:52 +010046#ifdef CONFIG_SLOW_WORK_DEBUG
David Howells8fba10a2009-11-19 18:10:51 +000047 slow_work_pids[id] = pid;
48#endif
49}
50
51static inline void slow_work_mark_time(struct slow_work *work)
52{
David Howellsa53f4f92010-03-29 13:08:52 +010053#ifdef CONFIG_SLOW_WORK_DEBUG
David Howells8fba10a2009-11-19 18:10:51 +000054 work->mark = CURRENT_TIME;
55#endif
56}
57
58static inline void slow_work_begin_exec(int id, struct slow_work *work)
59{
David Howellsa53f4f92010-03-29 13:08:52 +010060#ifdef CONFIG_SLOW_WORK_DEBUG
David Howells8fba10a2009-11-19 18:10:51 +000061 slow_work_execs[id] = work;
62#endif
63}
64
65static inline void slow_work_end_exec(int id, struct slow_work *work)
66{
David Howellsa53f4f92010-03-29 13:08:52 +010067#ifdef CONFIG_SLOW_WORK_DEBUG
David Howells8fba10a2009-11-19 18:10:51 +000068 write_lock(&slow_work_execs_lock);
69 slow_work_execs[id] = NULL;
70 write_unlock(&slow_work_execs_lock);
71#endif
72}