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

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Usage of taskstats interface by delay accounting.

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 00:24:41 -07:00 • committed by Linus Torvalds
parent c757249af1
commit 6f44993fe1
7 changed files with 144 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

15
include/linux/delayacct.h
View file

@ -18,6 +18,7 @@
#define _LINUX_DELAYACCT_H
#include <linux/sched.h>
#include <linux/taskstats_kern.h>
/*
* Per-task flags relevant to delay accounting
@ -35,6 +36,7 @@ extern void __delayacct_tsk_init(struct task_struct *);
extern void __delayacct_tsk_exit(struct task_struct *);
extern void __delayacct_blkio_start(void);
extern void __delayacct_blkio_end(void);
extern int __delayacct_add_tsk(struct taskstats *, struct task_struct *);
static inline void delayacct_set_flag(int flag)
{
@ -74,6 +76,16 @@ static inline void delayacct_blkio_end(void)
__delayacct_blkio_end();
}
static inline int delayacct_add_tsk(struct taskstats *d,
struct task_struct *tsk)
{
if (likely(!delayacct_on))
return -EINVAL;
if (!tsk->delays)
return 0;
return __delayacct_add_tsk(d, tsk);
}
#else
static inline void delayacct_set_flag(int flag)
{}
@ -89,6 +101,9 @@ static inline void delayacct_blkio_start(void)
{}
static inline void delayacct_blkio_end(void)
{}
static inline int delayacct_add_tsk(struct taskstats *d,
struct task_struct *tsk)
{ return 0; }
#endif /* CONFIG_TASK_DELAY_ACCT */
#endif

1
include/linux/sched.h
View file

@ -990,6 +990,7 @@ struct task_struct {
*/
struct pipe_inode_info *splice_pipe;
#ifdef CONFIG_TASK_DELAY_ACCT
spinlock_t delays_lock;
struct task_delay_info *delays;
#endif
};

55
include/linux/taskstats.h
View file

@ -34,7 +34,60 @@
struct taskstats {
/* Version 1 */
__u64 version;
__u16 version;
__u16 padding[3]; /* Userspace should not interpret the padding
* field which can be replaced by useful
* fields if struct taskstats is extended.
*/
/* Delay accounting fields start
*
* All values, until comment "Delay accounting fields end" are
* available only if delay accounting is enabled, even though the last
* few fields are not delays
*
* xxx_count is the number of delay values recorded
* xxx_delay_total is the corresponding cumulative delay in nanoseconds
*
* xxx_delay_total wraps around to zero on overflow
* xxx_count incremented regardless of overflow
*/
/* Delay waiting for cpu, while runnable
* count, delay_total NOT updated atomically
*/
__u64 cpu_count;
__u64 cpu_delay_total;
/* Following four fields atomically updated using task->delays->lock */
/* Delay waiting for synchronous block I/O to complete
* does not account for delays in I/O submission
*/
__u64 blkio_count;
__u64 blkio_delay_total;
/* Delay waiting for page fault I/O (swap in only) */
__u64 swapin_count;
__u64 swapin_delay_total;
/* cpu "wall-clock" running time
* On some architectures, value will adjust for cpu time stolen
* from the kernel in involuntary waits due to virtualization.
* Value is cumulative, in nanoseconds, without a corresponding count
* and wraps around to zero silently on overflow
*/
__u64 cpu_run_real_total;
/* cpu "virtual" running time
* Uses time intervals seen by the kernel i.e. no adjustment
* for kernel's involuntary waits due to virtualization.
* Value is cumulative, in nanoseconds, without a corresponding count
* and wraps around to zero silently on overflow
*/
__u64 cpu_run_virtual_total;
/* Delay accounting fields end */
/* version 1 ends here */
};

1
include/linux/taskstats_kern.h
View file

@ -17,6 +17,7 @@ enum {
#ifdef CONFIG_TASKSTATS
extern kmem_cache_t *taskstats_cache;
extern struct mutex taskstats_exit_mutex;
static inline void taskstats_exit_alloc(struct taskstats **ptidstats,
struct taskstats **ptgidstats)