> [4/9] ia64_self_update_process_times.patch
Next, we need to stop sampling in timer interrupt which
used for tick-based cpu time accounting.
Now the stime/utime of threads are updated in a function
update_process_times(), that is called from timer_interrupt().
[arch/ia64/kernel/time.c]
46 static irqreturn_t
47 timer_interrupt (int irq, void *dev_id)
48 {
:
65 while (1) {
66 update_process_times(user_mode(get_irq_regs()));
:
70 if (smp_processor_id() == time_keeper_id) {
:
78 do_timer(1);
:
84 if (time_after(new_itm, ia64_get_itc()))
85 break;
:
92 }
This update_process_times() is defined in kernel/timer.c.
Therefore, I copied this function into ia64 region to ready to
modify it as we like.
This patch just do copy. Later change will be done.
Thanks,
H.Seto
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@xxxxxxxxxxxxxx>
---
arch/ia64/kernel/time.c | 30 +++++++++++++++++++++++++++++-
1 files changed, 29 insertions(+), 1 deletion(-)
Index: linux-2.6.23/arch/ia64/kernel/time.c
===================================================================
--- linux-2.6.23.orig/arch/ia64/kernel/time.c
+++ linux-2.6.23/arch/ia64/kernel/time.c
@@ -61,6 +61,9 @@
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+#include <linux/kernel_stat.h>
+#include <linux/posix-timers.h>
+
/*
* Account time for a transition between system, hard irq
* or soft irq state.
@@ -70,6 +73,31 @@
}
+/*
+ * Called from the timer interrupt handler to charge one tick to the current
+ * process. user_tick is 1 if the tick is user time, 0 for system.
+ */
+static inline void ia64_update_process_times(int user_tick)
+{
+ struct task_struct *p = current;
+ int cpu = smp_processor_id();
+
+ /* Note: this timer irq context must be accounted for as well. */
+ if (user_tick)
+ account_user_time(p, jiffies_to_cputime(1));
+ else
+ account_system_time(p, HARDIRQ_OFFSET, jiffies_to_cputime(1));
+ run_local_timers();
+ if (rcu_pending(cpu))
+ rcu_check_callbacks(cpu, user_tick);
+ scheduler_tick();
+ run_posix_cpu_timers(p);
+}
+
+#else /* CONFIG_VIRT_CPU_ACCOUNTING */
+
+#define ia64_update_process_times(utick) update_process_times(utick)
+
#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
static irqreturn_t
@@ -92,7 +120,7 @@
profile_tick(CPU_PROFILING);
while (1) {
- update_process_times(user_mode(get_irq_regs()));
+ ia64_update_process_times(user_mode(get_irq_regs()));
new_itm += local_cpu_data->itm_delta;
-
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