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[PATCH] per-task-delay-accounting: taskstats interface

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Create a "taskstats" interface based on generic netlink (NETLINK_GENERIC
family), for getting statistics of tasks and thread groups during their
lifetime and when they exit.  The interface is intended for use by multiple
accounting packages though it is being created in the context of delay
accounting.

This patch creates the interface without populating the fields of the data
that is sent to the user in response to a command or upon the exit of a task.
Each accounting package interested in using taskstats has to provide an
additional patch to add its stats to the common structure.

[akpm@osdl.org: cleanups, Kconfig fix]
Signed-off-by: Shailabh Nagar <nagar@us.ibm.com>
Signed-off-by: Balbir Singh <balbir@in.ibm.com>
Cc: Jes Sorensen <jes@sgi.com>
Cc: Peter Chubb <peterc@gelato.unsw.edu.au>
Cc: Erich Focht <efocht@ess.nec.de>
Cc: Levent Serinol <lserinol@gmail.com>
Cc: Jay Lan <jlan@engr.sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Shailabh Nagar 2006-07-14 00:24:40 -07:00 • committed by Linus Torvalds
parent fb0ba6bd02
commit c757249af1
8 changed files with 646 additions and 0 deletions
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57
include/linux/taskstats_kern.h Normal file
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/* taskstats_kern.h - kernel header for per-task statistics interface
*
* Copyright (C) Shailabh Nagar, IBM Corp. 2006
* (C) Balbir Singh, IBM Corp. 2006
*/
#ifndef _LINUX_TASKSTATS_KERN_H
#define _LINUX_TASKSTATS_KERN_H
#include <linux/taskstats.h>
#include <linux/sched.h>
enum {
TASKSTATS_MSG_UNICAST, /* send data only to requester */
TASKSTATS_MSG_MULTICAST, /* send data to a group */
};
#ifdef CONFIG_TASKSTATS
extern kmem_cache_t *taskstats_cache;
static inline void taskstats_exit_alloc(struct taskstats **ptidstats,
struct taskstats **ptgidstats)
{
*ptidstats = kmem_cache_zalloc(taskstats_cache, SLAB_KERNEL);
*ptgidstats = kmem_cache_zalloc(taskstats_cache, SLAB_KERNEL);
}
static inline void taskstats_exit_free(struct taskstats *tidstats,
struct taskstats *tgidstats)
{
if (tidstats)
kmem_cache_free(taskstats_cache, tidstats);
if (tgidstats)
kmem_cache_free(taskstats_cache, tgidstats);
}
extern void taskstats_exit_send(struct task_struct *, struct taskstats *,
struct taskstats *);
extern void taskstats_init_early(void);
#else
static inline void taskstats_exit_alloc(struct taskstats **ptidstats,
struct taskstats **ptgidstats)
{}
static inline void taskstats_exit_free(struct taskstats *ptidstats,
struct taskstats *ptgidstats)
{}
static inline void taskstats_exit_send(struct task_struct *tsk,
struct taskstats *tidstats,
struct taskstats *tgidstats)
{}
static inline void taskstats_init_early(void)
{}
#endif /* CONFIG_TASKSTATS */
#endif