[PATCH] per-task-delay-accounting: setup (ca74e92b) · Commits · 戴 / test

Documentation/kernel-parameters.txt

+2 −0

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		@@ -448,6 +448,8 @@ running once the system is up.
		Format: <area>[,<node>]
		See also Documentation/networking/decnet.txt.

		delayacct [KNL] Enable per-task delay accounting

		dhash_entries= [KNL]
		Set number of hash buckets for dentry cache.

include/linux/delayacct.h

0 → 100644

+69 −0

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		/* 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 <linux/sched.h>

		#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

include/linux/sched.h

+20 −0

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		@@ -552,6 +552,23 @@ struct sched_info {
		extern struct file_operations proc_schedstat_operations;
		#endif

		#ifdef CONFIG_TASK_DELAY_ACCT
		struct task_delay_info {
		spinlock_t lock;
		unsigned int flags; /* Private per-task flags */

		/* For each stat XXX, add following, aligned appropriately
		*
		* struct timespec XXX_start, XXX_end;
		* u64 XXX_delay;
		* u32 XXX_count;
		*
		* Atomicity of updates to XXX_delay, XXX_count protected by
		* single lock above (split into XXX_lock if contention is an issue).
		*/
		};
		#endif

		enum idle_type
		{
		SCHED_IDLE,
		@@ -945,6 +962,9 @@ struct task_struct {
		* cache last used pipe for splice
		*/
		struct pipe_inode_info *splice_pipe;
		#ifdef CONFIG_TASK_DELAY_ACCT
		struct task_delay_info *delays;
		#endif
		};

		static inline pid_t process_group(struct task_struct *tsk)

include/linux/time.h

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		@@ -70,6 +70,18 @@ extern unsigned long mktime(const unsigned int year, const unsigned int mon,

		extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);

		/*
		* sub = lhs - rhs, in normalized form
		*/
		static inline struct timespec timespec_sub(struct timespec lhs,
		struct timespec rhs)
		{
		struct timespec ts_delta;
		set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
		lhs.tv_nsec - rhs.tv_nsec);
		return ts_delta;
		}

		/*
		* Returns true if the timespec is norm, false if denorm:
		*/

init/Kconfig

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		@@ -158,6 +158,16 @@ config BSD_PROCESS_ACCT_V3
		for processing it. A preliminary version of these tools is available
		at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.

		config TASK_DELAY_ACCT
		bool "Enable per-task delay accounting (EXPERIMENTAL)"
		help
		Collect information on time spent by a task waiting for system
		resources like cpu, synchronous block I/O completion and swapping
		in pages. Such statistics can help in setting a task's priorities
		relative to other tasks for cpu, io, rss limits etc.

		Say N if unsure.

		config SYSCTL
		bool "Sysctl support" if EMBEDDED
		default y

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