Messages in this thread | | | Date | Thu, 16 Aug 2007 12:56:57 +0530 | From | Balbir Singh <> | Subject | Re: [PATCH 1/2] Add scaled time to taskstats based process accounting |
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Hi, Michael,
Thanks for doing this, this is really useful.
Michael Neuling wrote: > This adds two items to the taststats struct to account for user and > system time based on scaling the CPU frequency and instruction issue > rates. > > Adds account_(user|system)_time_scaled callbacks which architectures > can use to account for time using this mechanism. > > Signed-off-by: Michael Neuling <mikey@neuling.org> > > --- > > include/linux/kernel_stat.h | 2 ++ > include/linux/sched.h | 2 +- > include/linux/taskstats.h | 6 +++++- > kernel/fork.c | 2 ++ > kernel/sched.c | 21 +++++++++++++++++++++ > kernel/timer.c | 7 +++++-- > kernel/tsacct.c | 4 ++++ > 7 files changed, 40 insertions(+), 4 deletions(-) > > Index: linux-2.6-ozlabs/include/linux/kernel_stat.h > =================================================================== > --- linux-2.6-ozlabs.orig/include/linux/kernel_stat.h > +++ linux-2.6-ozlabs/include/linux/kernel_stat.h > @@ -52,7 +52,9 @@ static inline int kstat_irqs(int irq) > } > > extern void account_user_time(struct task_struct *, cputime_t); > +extern void account_user_time_scaled(struct task_struct *, cputime_t); > extern void account_system_time(struct task_struct *, int, cputime_t); > +extern void account_system_time_scaled(struct task_struct *, cputime_t); > extern void account_steal_time(struct task_struct *, cputime_t); > > #endif /* _LINUX_KERNEL_STAT_H */ > Index: linux-2.6-ozlabs/include/linux/sched.h > =================================================================== > --- linux-2.6-ozlabs.orig/include/linux/sched.h > +++ linux-2.6-ozlabs/include/linux/sched.h > @@ -1020,7 +1020,7 @@ struct task_struct { > int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ > > unsigned int rt_priority; > - cputime_t utime, stime; > + cputime_t utime, stime, utimescaled, stimescaled; > unsigned long nvcsw, nivcsw; /* context switch counts */ > struct timespec start_time; /* monotonic time */ > struct timespec real_start_time; /* boot based time */ > Index: linux-2.6-ozlabs/include/linux/taskstats.h > =================================================================== > --- linux-2.6-ozlabs.orig/include/linux/taskstats.h > +++ linux-2.6-ozlabs/include/linux/taskstats.h > @@ -31,7 +31,7 @@ > */ > > > -#define TASKSTATS_VERSION 5 > +#define TASKSTATS_VERSION 6 > #define TS_COMM_LEN 32 /* should be >= TASK_COMM_LEN > * in linux/sched.h */ > > @@ -142,6 +142,10 @@ struct taskstats { > __u64 write_char; /* bytes written */ > __u64 read_syscalls; /* read syscalls */ > __u64 write_syscalls; /* write syscalls */ > + > + /* time accounting for SMT machines */ > + __u64 ac_utimescaled; /* utime scaled on frequency etc */ > + __u64 ac_stimescaled; /* stime scaled on frequency etc */ > /* Extended accounting fields end */ >
I'd also request for you to add a cpu_scaled_run_real_total for use by delay accounting. cpu_scaled_run_real_total should be similar in functionality to cpu_run_real_total.
> #define TASKSTATS_HAS_IO_ACCOUNTING > Index: linux-2.6-ozlabs/kernel/fork.c > =================================================================== > --- linux-2.6-ozlabs.orig/kernel/fork.c > +++ linux-2.6-ozlabs/kernel/fork.c > @@ -1045,6 +1045,8 @@ static struct task_struct *copy_process( > > p->utime = cputime_zero; > p->stime = cputime_zero; > + p->utimescaled = cputime_zero; > + p->stimescaled = cputime_zero; > > #ifdef CONFIG_TASK_XACCT > p->rchar = 0; /* I/O counter: bytes read */ > Index: linux-2.6-ozlabs/kernel/sched.c > =================================================================== > --- linux-2.6-ozlabs.orig/kernel/sched.c > +++ linux-2.6-ozlabs/kernel/sched.c > @@ -3249,6 +3249,16 @@ void account_user_time(struct task_struc > } > > /* > + * Account scaled user cpu time to a process. > + * @p: the process that the cpu time gets accounted to > + * @cputime: the cpu time spent in user space since the last update > + */ > +void account_user_time_scaled(struct task_struct *p, cputime_t cputime) > +{ > + p->utimescaled = cputime_add(p->utimescaled, cputime); > +} > + > +/* > * Account system cpu time to a process. > * @p: the process that the cpu time gets accounted to > * @hardirq_offset: the offset to subtract from hardirq_count() > @@ -3280,6 +3290,17 @@ void account_system_time(struct task_str > } > > /* > + * Account scaled system cpu time to a process. > + * @p: the process that the cpu time gets accounted to > + * @hardirq_offset: the offset to subtract from hardirq_count() > + * @cputime: the cpu time spent in kernel space since the last update > + */ > +void account_system_time_scaled(struct task_struct *p, cputime_t cputime) > +{ > + p->stimescaled = cputime_add(p->stimescaled, cputime); > +} > + > +/* > * Account for involuntary wait time. > * @p: the process from which the cpu time has been stolen > * @steal: the cpu time spent in involuntary wait > Index: linux-2.6-ozlabs/kernel/timer.c > =================================================================== > --- linux-2.6-ozlabs.orig/kernel/timer.c > +++ linux-2.6-ozlabs/kernel/timer.c > @@ -826,10 +826,13 @@ void update_process_times(int user_tick) > int cpu = smp_processor_id(); > > /* Note: this timer irq context must be accounted for as well. */ > - if (user_tick) > + if (user_tick) { > account_user_time(p, jiffies_to_cputime(1)); > - else > + account_user_time_scaled(p, jiffies_to_cputime(1)); > + } else { > account_system_time(p, HARDIRQ_OFFSET, jiffies_to_cputime(1)); > + account_system_time_scaled(p, jiffies_to_cputime(1)); > + }
I am a little confused here, scaled accounting and regular accounting go hand in hand?
> run_local_timers(); > if (rcu_pending(cpu)) > rcu_check_callbacks(cpu, user_tick); > Index: linux-2.6-ozlabs/kernel/tsacct.c > =================================================================== > --- linux-2.6-ozlabs.orig/kernel/tsacct.c > +++ linux-2.6-ozlabs/kernel/tsacct.c > @@ -62,6 +62,10 @@ void bacct_add_tsk(struct taskstats *sta > rcu_read_unlock(); > stats->ac_utime = cputime_to_msecs(tsk->utime) * USEC_PER_MSEC; > stats->ac_stime = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC; > + stats->ac_utimescaled = > + cputime_to_msecs(tsk->utimescaled) * USEC_PER_MSEC; > + stats->ac_stimescaled = > + cputime_to_msecs(tsk->stimescaled) * USEC_PER_MSEC; > stats->ac_minflt = tsk->min_flt; > stats->ac_majflt = tsk->maj_flt; >
-- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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