The patch titled
per-task-delay-accounting: cpu delay collection via schedstats
has been added to the -mm tree. Its filename is
per-task-delay-accounting-cpu-delay-collection-via-schedstats.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
From: Balbir Singh <balbir@xxxxxxxxxx>
Make the task-related schedstats functions callable by delay accounting even
if schedstats collection isn't turned on. This removes the dependency of
delay accounting on schedstats.
Signed-off-by: Chandra Seetharaman <sekharan@xxxxxxxxxx>
Signed-off-by: Shailabh Nagar <nagar@xxxxxxxxxxxxxx>
Signed-off-by: Balbir Singh <balbir@xxxxxxxxxx>
Cc: Jes Sorensen <jes@xxxxxxx>
Cc: Peter Chubb <peterc@xxxxxxxxxxxxxxxxxx>
Cc: Erich Focht <efocht@xxxxxxxxxx>
Cc: Levent Serinol <lserinol@xxxxxxxxx>
Cc: Jay Lan <jlan@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/linux/sched.h | 20 +++++++++++--
kernel/sched.c | 58 ++++++++++++++++++++++++++++------------
2 files changed, 58 insertions(+), 20 deletions(-)
diff -puN include/linux/sched.h~per-task-delay-accounting-cpu-delay-collection-via-schedstats include/linux/sched.h
--- 25/include/linux/sched.h~per-task-delay-accounting-cpu-delay-collection-via-schedstats Mon May 8 14:33:37 2006
+++ 25-akpm/include/linux/sched.h Mon May 8 14:33:37 2006
@@ -521,7 +521,7 @@ typedef struct prio_array prio_array_t;
struct backing_dev_info;
struct reclaim_state;
-#ifdef CONFIG_SCHEDSTATS
+#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
struct sched_info {
/* cumulative counters */
unsigned long cpu_time, /* time spent on the cpu */
@@ -532,9 +532,11 @@ struct sched_info {
unsigned long last_arrival, /* when we last ran on a cpu */
last_queued; /* when we were last queued to run */
};
+#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
+#ifdef CONFIG_SCHEDSTATS
extern struct file_operations proc_schedstat_operations;
-#endif
+#endif /* CONFIG_SCHEDSTATS */
#ifdef CONFIG_TASK_DELAY_ACCT
struct task_delay_info {
@@ -557,7 +559,19 @@ struct task_delay_info {
u32 blkio_count;
u32 swapin_count;
};
+#endif /* CONFIG_TASK_DELAY_ACCT */
+
+static inline int sched_info_on(void)
+{
+#ifdef CONFIG_SCHEDSTATS
+ return 1;
+#elif defined(CONFIG_TASK_DELAY_ACCT)
+ extern int delayacct_on;
+ return delayacct_on;
+#else
+ return 0;
#endif
+}
enum idle_type
{
@@ -744,7 +758,7 @@ struct task_struct {
cpumask_t cpus_allowed;
unsigned int time_slice, first_time_slice;
-#ifdef CONFIG_SCHEDSTATS
+#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
struct sched_info sched_info;
#endif
diff -puN kernel/sched.c~per-task-delay-accounting-cpu-delay-collection-via-schedstats kernel/sched.c
--- 25/kernel/sched.c~per-task-delay-accounting-cpu-delay-collection-via-schedstats Mon May 8 14:33:37 2006
+++ 25-akpm/kernel/sched.c Mon May 8 14:33:37 2006
@@ -469,9 +469,34 @@ struct file_operations proc_schedstat_op
.release = single_release,
};
+/*
+ * Expects runqueue lock to be held for atomicity of update
+ */
+static inline void rq_sched_info_arrive(struct runqueue *rq,
+ unsigned long diff)
+{
+ if (rq) {
+ rq->rq_sched_info.run_delay += diff;
+ rq->rq_sched_info.pcnt++;
+ }
+}
+
+/*
+ * Expects runqueue lock to be held for atomicity of update
+ */
+static inline void rq_sched_info_depart(struct runqueue *rq,
+ unsigned long diff)
+{
+ if (rq)
+ rq->rq_sched_info.cpu_time += diff;
+}
# define schedstat_inc(rq, field) do { (rq)->field++; } while (0)
# define schedstat_add(rq, field, amt) do { (rq)->field += (amt); } while (0)
#else /* !CONFIG_SCHEDSTATS */
+static inline void rq_sched_info_arrive(struct runqueue *rq, unsigned long diff)
+{}
+static inline void rq_sched_info_depart(struct runqueue *rq, unsigned long diff)
+{}
# define schedstat_inc(rq, field) do { } while (0)
# define schedstat_add(rq, field, amt) do { } while (0)
#endif
@@ -491,7 +516,7 @@ static inline runqueue_t *this_rq_lock(v
return rq;
}
-#ifdef CONFIG_SCHEDSTATS
+#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
/*
* Called when a process is dequeued from the active array and given
* the cpu. We should note that with the exception of interactive
@@ -520,7 +545,6 @@ static inline void sched_info_dequeued(t
static void sched_info_arrive(task_t *t)
{
unsigned long now = jiffies, diff = 0;
- struct runqueue *rq = task_rq(t);
if (t->sched_info.last_queued)
diff = now - t->sched_info.last_queued;
@@ -529,11 +553,7 @@ static void sched_info_arrive(task_t *t)
t->sched_info.last_arrival = now;
t->sched_info.pcnt++;
- if (!rq)
- return;
-
- rq->rq_sched_info.run_delay += diff;
- rq->rq_sched_info.pcnt++;
+ rq_sched_info_arrive(task_rq(t), diff);
}
/*
@@ -553,8 +573,9 @@ static void sched_info_arrive(task_t *t)
*/
static inline void sched_info_queued(task_t *t)
{
- if (!t->sched_info.last_queued)
- t->sched_info.last_queued = jiffies;
+ if (unlikely(sched_info_on()))
+ if (!t->sched_info.last_queued)
+ t->sched_info.last_queued = jiffies;
}
/*
@@ -563,13 +584,10 @@ static inline void sched_info_queued(tas
*/
static inline void sched_info_depart(task_t *t)
{
- struct runqueue *rq = task_rq(t);
unsigned long diff = jiffies - t->sched_info.last_arrival;
t->sched_info.cpu_time += diff;
-
- if (rq)
- rq->rq_sched_info.cpu_time += diff;
+ rq_sched_info_depart(task_rq(t), diff);
}
/*
@@ -577,7 +595,7 @@ static inline void sched_info_depart(tas
* their time slice. (This may also be called when switching to or from
* the idle task.) We are only called when prev != next.
*/
-static inline void sched_info_switch(task_t *prev, task_t *next)
+static inline void __sched_info_switch(task_t *prev, task_t *next)
{
struct runqueue *rq = task_rq(prev);
@@ -592,10 +610,15 @@ static inline void sched_info_switch(tas
if (next != rq->idle)
sched_info_arrive(next);
}
+static inline void sched_info_switch(task_t *prev, task_t *next)
+{
+ if (unlikely(sched_info_on()))
+ __sched_info_switch(prev, next);
+}
#else
#define sched_info_queued(t) do { } while (0)
#define sched_info_switch(t, next) do { } while (0)
-#endif /* CONFIG_SCHEDSTATS */
+#endif /* CONFIG_SCHEDSTATS || CONFIG_TASK_DELAY_ACCT */
/*
* Adding/removing a task to/from a priority array:
@@ -1393,8 +1416,9 @@ void fastcall sched_fork(task_t *p, int
p->state = TASK_RUNNING;
INIT_LIST_HEAD(&p->run_list);
p->array = NULL;
-#ifdef CONFIG_SCHEDSTATS
- memset(&p->sched_info, 0, sizeof(p->sched_info));
+#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
+ if (unlikely(sched_info_on()))
+ memset(&p->sched_info, 0, sizeof(p->sched_info));
#endif
#if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW)
p->oncpu = 0;
_
Patches currently in -mm which might be from balbir@xxxxxxxxxx are
fix-dcache-race-during-umount.patch
fix-dcache-race-during-umount-fix.patch
prune_one_dentry-tweaks.patch
per-task-delay-accounting-setup.patch
per-task-delay-accounting-sync-block-i-o-and-swapin-delay-collection.patch
per-task-delay-accounting-cpu-delay-collection-via-schedstats.patch
per-task-delay-accounting-utilities-for-genetlink-usage.patch
per-task-delay-accounting-taskstats-interface.patch
per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface.patch
per-task-delay-accounting-documentation.patch
per-task-delay-accounting-proc-export-of-aggregated-block-i-o-delays.patch
-
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