From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hidetoshi Seto Date: Tue, 16 Oct 2007 13:37:46 +0000 Subject: [PATCH 4/9] ia64: VIRT_CPU_ACCOUNTING (accurate cpu time accounting) Message-Id: <4714BEAA.5050008@jp.fujitsu.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-2022-jp" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org > [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 --- 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 +#include + /* * 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;