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Subject[Patch 3/9] Block I/O accounting initialization
From
Date
delayacct-blkio-init.patch

Setup variables and functions to collect per-task
block I/O delays.

Separating the collection part to a later patch
for easier review and discussion.

Signed-off-by: Shailabh Nagar <nagar@watson.ibm.com>


include/linux/delayacct.h | 16 ++++++++++++++++
include/linux/sched.h | 4 ++++
kernel/delayacct.c | 14 ++++++++++++++
3 files changed, 34 insertions(+)

Index: linux-2.6.16-rc5/include/linux/delayacct.h
===================================================================
--- linux-2.6.16-rc5.orig/include/linux/delayacct.h 2006-03-11 07:41:37.000000000 -0500
+++ linux-2.6.16-rc5/include/linux/delayacct.h 2006-03-11 07:41:38.000000000 -0500
@@ -22,6 +22,8 @@ extern kmem_cache_t *delayacct_cache;
extern int delayacct_init(void);
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);

static inline void delayacct_tsk_init(struct task_struct *tsk)
{
@@ -37,6 +39,16 @@ static inline void delayacct_tsk_exit(st
__delayacct_tsk_exit(tsk);
}

+static inline void delayacct_blkio_start(void)
+{
+ if (unlikely(delayacct_on))
+ __delayacct_blkio_start();
+}
+static inline void delayacct_blkio_end(void)
+{
+ if (unlikely(delayacct_on))
+ __delayacct_blkio_end();
+}
#else
static inline int delayacct_init(void)
{}
@@ -44,5 +56,9 @@ static inline void delayacct_tsk_init(st
{}
static inline void delayacct_tsk_exit(struct task_struct *tsk)
{}
+static inline void delayacct_blkio_start(void)
+{}
+static inline void delayacct_blkio_end(void)
+{}
#endif /* CONFIG_TASK_DELAY_ACCT */
#endif /* _LINUX_TASKDELAYS_H */
Index: linux-2.6.16-rc5/kernel/delayacct.c
===================================================================
--- linux-2.6.16-rc5.orig/kernel/delayacct.c 2006-03-11 07:41:37.000000000 -0500
+++ linux-2.6.16-rc5/kernel/delayacct.c 2006-03-11 07:41:38.000000000 -0500
@@ -90,3 +90,17 @@ static inline void delayacct_end(struct
spin_unlock(&current->delays->lock);
}

+void __delayacct_blkio_start(void)
+{
+ if (current->delays)
+ delayacct_start(&current->delays->blkio_start);
+}
+
+void __delayacct_blkio_end(void)
+{
+ if (current->delays)
+ delayacct_end(&current->delays->blkio_start,
+ &current->delays->blkio_end,
+ &current->delays->blkio_delay,
+ &current->delays->blkio_count);
+}
Index: linux-2.6.16-rc5/include/linux/sched.h
===================================================================
--- linux-2.6.16-rc5.orig/include/linux/sched.h 2006-03-11 07:41:37.000000000 -0500
+++ linux-2.6.16-rc5/include/linux/sched.h 2006-03-11 07:41:38.000000000 -0500
@@ -549,6 +549,10 @@ struct task_delay_info {
* u64 XXX_delay;
* u32 XXX_count;
*/
+
+ struct timespec blkio_start, blkio_end;
+ u64 blkio_delay; /* wait for sync block io completion */
+ u32 blkio_count;
};
#endif


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