David Howells | 8fba10a | 2009-11-19 18:10:51 +0000 | [diff] [blame] | 1 | /* 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 Howells | f13a48b | 2009-12-01 15:36:11 +0000 | [diff] [blame] | 22 | #ifdef CONFIG_SLOW_WORK_DEBUG |
David Howells | 8fba10a | 2009-11-19 18:10:51 +0000 | [diff] [blame] | 23 | extern struct slow_work *slow_work_execs[]; |
| 24 | extern pid_t slow_work_pids[]; |
| 25 | extern rwlock_t slow_work_execs_lock; |
| 26 | #endif |
| 27 | |
| 28 | extern struct list_head slow_work_queue; |
| 29 | extern struct list_head vslow_work_queue; |
| 30 | extern spinlock_t slow_work_queue_lock; |
| 31 | |
| 32 | /* |
David Howells | f13a48b | 2009-12-01 15:36:11 +0000 | [diff] [blame] | 33 | * slow-work-debugfs.c |
David Howells | 8fba10a | 2009-11-19 18:10:51 +0000 | [diff] [blame] | 34 | */ |
David Howells | f13a48b | 2009-12-01 15:36:11 +0000 | [diff] [blame] | 35 | #ifdef CONFIG_SLOW_WORK_DEBUG |
David Howells | 8fba10a | 2009-11-19 18:10:51 +0000 | [diff] [blame] | 36 | extern const struct file_operations slow_work_runqueue_fops; |
| 37 | |
| 38 | extern void slow_work_new_thread_desc(struct slow_work *, struct seq_file *); |
| 39 | #endif |
| 40 | |
| 41 | /* |
| 42 | * Helper functions |
| 43 | */ |
| 44 | static inline void slow_work_set_thread_pid(int id, pid_t pid) |
| 45 | { |
David Howells | a53f4f9 | 2010-03-29 13:08:52 +0100 | [diff] [blame] | 46 | #ifdef CONFIG_SLOW_WORK_DEBUG |
David Howells | 8fba10a | 2009-11-19 18:10:51 +0000 | [diff] [blame] | 47 | slow_work_pids[id] = pid; |
| 48 | #endif |
| 49 | } |
| 50 | |
| 51 | static inline void slow_work_mark_time(struct slow_work *work) |
| 52 | { |
David Howells | a53f4f9 | 2010-03-29 13:08:52 +0100 | [diff] [blame] | 53 | #ifdef CONFIG_SLOW_WORK_DEBUG |
David Howells | 8fba10a | 2009-11-19 18:10:51 +0000 | [diff] [blame] | 54 | work->mark = CURRENT_TIME; |
| 55 | #endif |
| 56 | } |
| 57 | |
| 58 | static inline void slow_work_begin_exec(int id, struct slow_work *work) |
| 59 | { |
David Howells | a53f4f9 | 2010-03-29 13:08:52 +0100 | [diff] [blame] | 60 | #ifdef CONFIG_SLOW_WORK_DEBUG |
David Howells | 8fba10a | 2009-11-19 18:10:51 +0000 | [diff] [blame] | 61 | slow_work_execs[id] = work; |
| 62 | #endif |
| 63 | } |
| 64 | |
| 65 | static inline void slow_work_end_exec(int id, struct slow_work *work) |
| 66 | { |
David Howells | a53f4f9 | 2010-03-29 13:08:52 +0100 | [diff] [blame] | 67 | #ifdef CONFIG_SLOW_WORK_DEBUG |
David Howells | 8fba10a | 2009-11-19 18:10:51 +0000 | [diff] [blame] | 68 | write_lock(&slow_work_execs_lock); |
| 69 | slow_work_execs[id] = NULL; |
| 70 | write_unlock(&slow_work_execs_lock); |
| 71 | #endif |
| 72 | } |