From ca74e92b4698276b6696f15a801759f50944f387 Mon Sep 17 00:00:00 2001 From: Shailabh Nagar Date: Fri, 14 Jul 2006 00:24:36 -0700 Subject: [PATCH] per-task-delay-accounting: setup Initialization code related to collection of per-task "delay" statistics which measure how long it had to wait for cpu, sync block io, swapping etc. The collection of statistics and the interface are in other patches. This patch sets up the data structures and allows the statistics collection to be disabled through a kernel boot parameter. Signed-off-by: Shailabh Nagar Signed-off-by: Balbir Singh Cc: Jes Sorensen Cc: Peter Chubb Cc: Erich Focht Cc: Levent Serinol Cc: Jay Lan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/delayacct.h | 69 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 include/linux/delayacct.h (limited to 'include/linux/delayacct.h') diff --git a/include/linux/delayacct.h b/include/linux/delayacct.h new file mode 100644 index 0000000..9572cfa --- /dev/null +++ b/include/linux/delayacct.h @@ -0,0 +1,69 @@ +/* delayacct.h - per-task delay accounting + * + * Copyright (C) Shailabh Nagar, IBM Corp. 2006 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + */ + +#ifndef _LINUX_DELAYACCT_H +#define _LINUX_DELAYACCT_H + +#include + +#ifdef CONFIG_TASK_DELAY_ACCT + +extern int delayacct_on; /* Delay accounting turned on/off */ +extern kmem_cache_t *delayacct_cache; +extern void delayacct_init(void); +extern void __delayacct_tsk_init(struct task_struct *); +extern void __delayacct_tsk_exit(struct task_struct *); + +static inline void delayacct_set_flag(int flag) +{ + if (current->delays) + current->delays->flags |= flag; +} + +static inline void delayacct_clear_flag(int flag) +{ + if (current->delays) + current->delays->flags &= ~flag; +} + +static inline void delayacct_tsk_init(struct task_struct *tsk) +{ + /* reinitialize in case parent's non-null pointer was dup'ed*/ + tsk->delays = NULL; + if (unlikely(delayacct_on)) + __delayacct_tsk_init(tsk); +} + +static inline void delayacct_tsk_exit(struct task_struct *tsk) +{ + if (tsk->delays) + __delayacct_tsk_exit(tsk); +} + +#else +static inline void delayacct_set_flag(int flag) +{} +static inline void delayacct_clear_flag(int flag) +{} +static inline void delayacct_init(void) +{} +static inline void delayacct_tsk_init(struct task_struct *tsk) +{} +static inline void delayacct_tsk_exit(struct task_struct *tsk) +{} +#endif /* CONFIG_TASK_DELAY_ACCT */ + +#endif -- cgit v1.1