delayacct-procfs.patch
Export I/O delays seen by a task through /proc/<tgid>/stats
for use in top etc.
Note that delays for I/O done for swapping in pages (swapin I/O) is
clubbed together with all other I/O here (this is not the
case in the netlink interface where the swapin I/O is kept distinct)
Signed-off-by: Shailabh Nagar <[email protected]>
fs/proc/array.c | 6 ++++--
include/linux/delayacct.h | 11 +++++++++++
kernel/delayacct.c | 15 +++++++++++++++
3 files changed, 30 insertions(+), 2 deletions(-)
Index: linux-2.6.16/fs/proc/array.c
===================================================================
--- linux-2.6.16.orig/fs/proc/array.c 2006-03-29 18:12:54.000000000 -0500
+++ linux-2.6.16/fs/proc/array.c 2006-03-29 18:13:21.000000000 -0500
@@ -75,6 +75,7 @@
#include <linux/times.h>
#include <linux/cpuset.h>
#include <linux/rcupdate.h>
+#include <linux/delayacct.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
@@ -414,7 +415,7 @@ static int do_task_stat(struct task_stru
res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
%lu %lu %lu %lu %lu %ld %ld %ld %ld %d %ld %llu %lu %ld %lu %lu %lu %lu %lu \
-%lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu\n",
+%lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu %llu\n",
task->pid,
tcomm,
state,
@@ -459,7 +460,8 @@ static int do_task_stat(struct task_stru
task->exit_signal,
task_cpu(task),
task->rt_priority,
- task->policy);
+ task->policy,
+ delayacct_blkio_ticks(task));
if(mm)
mmput(mm);
return res;
Index: linux-2.6.16/include/linux/delayacct.h
===================================================================
--- linux-2.6.16.orig/include/linux/delayacct.h 2006-03-29 18:13:18.000000000 -0500
+++ linux-2.6.16/include/linux/delayacct.h 2006-03-29 18:13:21.000000000 -0500
@@ -29,6 +29,7 @@ extern void __delayacct_tsk_exit(struct
extern void __delayacct_blkio_start(void);
extern void __delayacct_blkio_end(void);
extern int __delayacct_add_tsk(struct taskstats *, struct task_struct *);
+extern unsigned long long __delayacct_blkio_ticks(struct task_struct *);
static inline void delayacct_tsk_init(struct task_struct *tsk)
{
@@ -54,6 +55,12 @@ static inline void delayacct_blkio_end(v
if (current->delays)
__delayacct_blkio_end();
}
+static inline unsigned long long delayacct_blkio_ticks(struct task_struct *tsk)
+{
+ if (unlikely(delayacct_on))
+ return __delayacct_blkio_ticks(tsk);
+ return 0;
+}
#else
static inline void delayacct_init(void)
{}
@@ -65,6 +72,10 @@ static inline void delayacct_blkio_start
{}
static inline void delayacct_blkio_end(void)
{}
+static inline unsigned long long delayacct_blkio_ticks(struct task_struct *tsk)
+{
+ return 0;
+}
#endif /* CONFIG_TASK_DELAY_ACCT */
#ifdef CONFIG_TASKSTATS
static inline int delayacct_add_tsk(struct taskstats *d,
Index: linux-2.6.16/kernel/delayacct.c
===================================================================
--- linux-2.6.16.orig/kernel/delayacct.c 2006-03-29 18:13:20.000000000 -0500
+++ linux-2.6.16/kernel/delayacct.c 2006-03-29 18:13:21.000000000 -0500
@@ -118,6 +118,21 @@ void __delayacct_blkio_end(void)
¤t->delays->blkio_delay,
¤t->delays->blkio_count);
}
+
+unsigned long long __delayacct_blkio_ticks(struct task_struct *tsk)
+{
+ unsigned long long ret;
+
+ if (!tsk->delays)
+ return 0;
+
+ spin_lock(&tsk->delays->lock);
+ ret = nsec_to_clock_t(tsk->delays->blkio_delay +
+ tsk->delays->swapin_delay);
+ spin_unlock(&tsk->delays->lock);
+ return ret;
+}
+
#ifdef CONFIG_TASKSTATS
int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
{
-
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