diff options
authorBharath Ravi <bharathravi1@gmail.com>2008-06-16 15:11:01 +0530
committerIngo Molnar <mingo@elte.hu>2008-06-19 14:15:28 +0200
commitd4abc238c9f4df8b3216f3e883f5d0a07b7ac75a (patch)
parentd819c49da624e3ee09b2844603d58265039eecdd (diff)
sched, delay accounting: fix incorrect delay time when constantly waiting on runqueue
This patch corrects the incorrect value of per process run-queue wait time reported by delay statistics. The anomaly was due to the following reason. When a process leaves the CPU and immediately starts waiting for CPU on the runqueue (which means it remains in the TASK_RUNNABLE state), the time of re-entry into the run-queue is never recorded. Due to this, the waiting time on the runqueue from this point of re-entry upto the next time it hits the CPU is not accounted for. This is solved by recording the time of re-entry of a process leaving the CPU in the sched_info_depart() function IF the process will go back to waiting on the run-queue. This IF condition is verified by checking whether the process is still in the TASK_RUNNABLE state. The patch was tested on 2.6.26-rc6 using two simple CPU hog programs. The values noted prior to the fix did not account for the time spent on the runqueue waiting. After the fix, the correct values were reported back to user space. Signed-off-by: Bharath Ravi <bharathravi1@gmail.com> Signed-off-by: Madhava K R <madhavakr@gmail.com> Cc: dhaval@linux.vnet.ibm.com Cc: vatsa@in.ibm.com Cc: balbir@in.ibm.com Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index a38878e0e49d..80179ef7450e 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -198,6 +198,9 @@ static inline void sched_info_queued(struct task_struct *t)
* Called when a process ceases being the active-running process, either
* voluntarily or involuntarily. Now we can calculate how long we ran.
+ * Also, if the process is still in the TASK_RUNNING state, call
+ * sched_info_queued() to mark that it has now again started waiting on
+ * the runqueue.
static inline void sched_info_depart(struct task_struct *t)
@@ -206,6 +209,9 @@ static inline void sched_info_depart(struct task_struct *t)
t->sched_info.cpu_time += delta;
rq_sched_info_depart(task_rq(t), delta);
+ if (t->state == TASK_RUNNING)
+ sched_info_queued(t);