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Date: Tue, 15 Nov 2011 22:12:44 -0800
From: Paul Turner <pjt@...gle.com>
To: Glauber Costa <glommer@...allels.com>
CC: linux-kernel@...r.kernel.org, paul@...lmenage.org,
lizf@...fujitsu.com, daniel.lezcano@...e.fr,
a.p.zijlstra@...llo.nl, jbottomley@...allels.com,
cgroups@...r.kernel.org
Subject: Re: [PATCH 2/4] split kernel stat in two
On 11/15/2011 07:59 AM, Glauber Costa wrote:
> In a later patch, we will use cpustat information per-task group.
> However, some of its fields are naturally global, such as the irq
> counters. There is no need to impose the task group overhead to them
> in this case. So better separate them.
>
> Signed-off-by: Glauber Costa<glommer@...allels.com>
> CC: Paul Tuner<pjt@...gle.com>
> ---
> arch/s390/appldata/appldata_os.c | 16 +++++++-------
> arch/x86/include/asm/i387.h | 2 +-
> drivers/cpufreq/cpufreq_conservative.c | 20 ++++++++--------
> drivers/cpufreq/cpufreq_ondemand.c | 20 ++++++++--------
> drivers/macintosh/rack-meter.c | 6 ++--
> fs/proc/stat.c | 36 ++++++++++++++++----------------
> include/linux/kernel_stat.h | 8 ++++++-
> kernel/sched.c | 18 ++++++++-------
> 8 files changed, 67 insertions(+), 59 deletions(-)
>
> diff --git a/arch/s390/appldata/appldata_os.c b/arch/s390/appldata/appldata_os.c
> index 3d6b672..695388a 100644
> --- a/arch/s390/appldata/appldata_os.c
> +++ b/arch/s390/appldata/appldata_os.c
> @@ -115,21 +115,21 @@ static void appldata_get_os_data(void *data)
> j = 0;
> for_each_online_cpu(i) {
> os_data->os_cpu[j].per_cpu_user =
> - cputime_to_jiffies(kstat_cpu(i).cpustat[USER]);
> + cputime_to_jiffies(kcpustat_cpu(i).cpustat[USER]);
> os_data->os_cpu[j].per_cpu_nice =
> - cputime_to_jiffies(kstat_cpu(i).cpustat[NICE]);
> + cputime_to_jiffies(kcpustat_cpu(i).cpustat[NICE]);
> os_data->os_cpu[j].per_cpu_system =
> - cputime_to_jiffies(kstat_cpu(i).cpustat[SYSTEM]);
> + cputime_to_jiffies(kcpustat_cpu(i).cpustat[SYSTEM]);
> os_data->os_cpu[j].per_cpu_idle =
> - cputime_to_jiffies(kstat_cpu(i).cpustat[IDLE]);
> + cputime_to_jiffies(kcpustat_cpu(i).cpustat[IDLE]);
> os_data->os_cpu[j].per_cpu_irq =
> - cputime_to_jiffies(kstat_cpu(i).cpustat[IRQ]);
> + cputime_to_jiffies(kcpustat_cpu(i).cpustat[IRQ]);
> os_data->os_cpu[j].per_cpu_softirq =
> - cputime_to_jiffies(kstat_cpu(i).cpustat[SOFTIRQ]);
> + cputime_to_jiffies(kcpustat_cpu(i).cpustat[SOFTIRQ]);
> os_data->os_cpu[j].per_cpu_iowait =
> - cputime_to_jiffies(kstat_cpu(i).cpustat[IOWAIT]);
> + cputime_to_jiffies(kcpustat_cpu(i).cpustat[IOWAIT]);
> os_data->os_cpu[j].per_cpu_steal =
> - cputime_to_jiffies(kstat_cpu(i).cpustat[STEAL]);
> + cputime_to_jiffies(kcpustat_cpu(i).cpustat[STEAL]);
> os_data->os_cpu[j].cpu_id = i;
> j++;
> }
> diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h
> index 56fa4d7..1f1b536 100644
> --- a/arch/x86/include/asm/i387.h
> +++ b/arch/x86/include/asm/i387.h
> @@ -218,7 +218,7 @@ static inline void fpu_fxsave(struct fpu *fpu)
> #ifdef CONFIG_SMP
> #define safe_address (__per_cpu_offset[0])
> #else
> -#define safe_address (kstat_cpu(0).cpustat[USER])
> +#define safe_address (__get_cpu_var(kernel_cpustat).cpustat[USER])
> #endif
>
> /*
> diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
> index 2ab538f..a3a739f 100644
> --- a/drivers/cpufreq/cpufreq_conservative.c
> +++ b/drivers/cpufreq/cpufreq_conservative.c
> @@ -103,13 +103,13 @@ static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
> cputime64_t busy_time;
>
> cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
> - busy_time = cputime64_add(kstat_cpu(cpu).cpustat[USER],
> - kstat_cpu(cpu).cpustat[SYSTEM]);
> + busy_time = cputime64_add(kcpustat_cpu(cpu).cpustat[USER],
> + kcpustat_cpu(cpu).cpustat[SYSTEM]);
>
> - busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat[IRQ]);
> - busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat[SOFTIRQ]);
> - busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat[STEAL]);
> - busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat[NICE]);
> + busy_time = cputime64_add(busy_time, kcpustat_cpu(cpu).cpustat[IRQ]);
> + busy_time = cputime64_add(busy_time, kcpustat_cpu(cpu).cpustat[SOFTIRQ]);
> + busy_time = cputime64_add(busy_time, kcpustat_cpu(cpu).cpustat[STEAL]);
> + busy_time = cputime64_add(busy_time, kcpustat_cpu(cpu).cpustat[NICE]);
>
This clobbers almost *all* the same lines as the last patch. There has to be a
more readable way of structuring these 2 patches.
> idle_time = cputime64_sub(cur_wall_time, busy_time);
> if (wall)
> @@ -272,7 +272,7 @@ static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
> dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
> &dbs_info->prev_cpu_wall);
> if (dbs_tuners_ins.ignore_nice)
> - dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat[NICE];
> + dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[NICE];
> }
> return count;
> }
> @@ -365,7 +365,7 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
> cputime64_t cur_nice;
> unsigned long cur_nice_jiffies;
>
> - cur_nice = cputime64_sub(kstat_cpu(j).cpustat[NICE],
> + cur_nice = cputime64_sub(kcpustat_cpu(j).cpustat[NICE],
> j_dbs_info->prev_cpu_nice);
> /*
> * Assumption: nice time between sampling periods will
> @@ -374,7 +374,7 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
> cur_nice_jiffies = (unsigned long)
> cputime64_to_jiffies64(cur_nice);
>
> - j_dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat[NICE];
> + j_dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[NICE];
> idle_time += jiffies_to_usecs(cur_nice_jiffies);
> }
>
> @@ -503,7 +503,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
> &j_dbs_info->prev_cpu_wall);
> if (dbs_tuners_ins.ignore_nice)
> j_dbs_info->prev_cpu_nice =
> - kstat_cpu(j).cpustat[NICE];
> + kcpustat_cpu(j).cpustat[NICE];
> }
> this_dbs_info->down_skip = 0;
> this_dbs_info->requested_freq = policy->cur;
> diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
> index 45d8e17..46e89663 100644
> --- a/drivers/cpufreq/cpufreq_ondemand.c
> +++ b/drivers/cpufreq/cpufreq_ondemand.c
> @@ -127,13 +127,13 @@ static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
> cputime64_t busy_time;
>
> cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
> - busy_time = cputime64_add(kstat_cpu(cpu).cpustat[USER],
> - kstat_cpu(cpu).cpustat[SYSTEM]);
> + busy_time = cputime64_add(kcpustat_cpu(cpu).cpustat[USER],
> + kcpustat_cpu(cpu).cpustat[SYSTEM]);
>
> - busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat[IRQ]);
> - busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat[SOFTIRQ]);
> - busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat[STEAL]);
> - busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat[NICE]);
> + busy_time = cputime64_add(busy_time, kcpustat_cpu(cpu).cpustat[IRQ]);
> + busy_time = cputime64_add(busy_time, kcpustat_cpu(cpu).cpustat[SOFTIRQ]);
> + busy_time = cputime64_add(busy_time, kcpustat_cpu(cpu).cpustat[STEAL]);
> + busy_time = cputime64_add(busy_time, kcpustat_cpu(cpu).cpustat[NICE]);
>
> idle_time = cputime64_sub(cur_wall_time, busy_time);
> if (wall)
> @@ -345,7 +345,7 @@ static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
> dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
> &dbs_info->prev_cpu_wall);
> if (dbs_tuners_ins.ignore_nice)
> - dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat[NICE];
> + dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[NICE];
>
> }
> return count;
> @@ -458,7 +458,7 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
> cputime64_t cur_nice;
> unsigned long cur_nice_jiffies;
>
> - cur_nice = cputime64_sub(kstat_cpu(j).cpustat[NICE],
> + cur_nice = cputime64_sub(kcpustat_cpu(j).cpustat[NICE],
> j_dbs_info->prev_cpu_nice);
> /*
> * Assumption: nice time between sampling periods will
> @@ -467,7 +467,7 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
> cur_nice_jiffies = (unsigned long)
> cputime64_to_jiffies64(cur_nice);
>
> - j_dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat[NICE];
> + j_dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[NICE];
> idle_time += jiffies_to_usecs(cur_nice_jiffies);
> }
>
> @@ -648,7 +648,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
> &j_dbs_info->prev_cpu_wall);
> if (dbs_tuners_ins.ignore_nice)
> j_dbs_info->prev_cpu_nice =
> - kstat_cpu(j).cpustat[NICE];
> + kcpustat_cpu(j).cpustat[NICE];
> }
> this_dbs_info->cpu = cpu;
> this_dbs_info->rate_mult = 1;
> diff --git a/drivers/macintosh/rack-meter.c b/drivers/macintosh/rack-meter.c
> index c80e49a..c8e67b0 100644
> --- a/drivers/macintosh/rack-meter.c
> +++ b/drivers/macintosh/rack-meter.c
> @@ -83,11 +83,11 @@ static inline cputime64_t get_cpu_idle_time(unsigned int cpu)
> {
> cputime64_t retval;
>
> - retval = cputime64_add(kstat_cpu(cpu).cpustat[IDLE],
> - kstat_cpu(cpu).cpustat[IOWAIT]);
> + retval = cputime64_add(kcpustat_cpu(cpu).cpustat[IDLE],
> + kcpustat_cpu(cpu).cpustat[IOWAIT]);
>
> if (rackmeter_ignore_nice)
> - retval = cputime64_add(retval, kstat_cpu(cpu).cpustat[NICE]);
> + retval = cputime64_add(retval, kcpustat_cpu(cpu).cpustat[NICE]);
>
> return retval;
> }
> diff --git a/fs/proc/stat.c b/fs/proc/stat.c
> index b7b74ad..6ab20db 100644
> --- a/fs/proc/stat.c
> +++ b/fs/proc/stat.c
> @@ -28,7 +28,7 @@ static u64 get_idle_time(int cpu)
>
> if (idle_time == -1ULL) {
> /* !NO_HZ so we can rely on cpustat.idle */
> - idle = kstat_cpu(cpu).cpustat[IDLE];
> + idle = kcpustat_cpu(cpu).cpustat[IDLE];
> idle += arch_idle_time(cpu);
> } else
> idle = usecs_to_cputime(idle_time);
> @@ -42,7 +42,7 @@ static u64 get_iowait_time(int cpu)
>
> if (iowait_time == -1ULL)
> /* !NO_HZ so we can rely on cpustat.iowait */
> - iowait = kstat_cpu(cpu).cpustat[IOWAIT];
> + iowait = kcpustat_cpu(cpu).cpustat[IOWAIT];
> else
> iowait = usecs_to_cputime(iowait_time);
>
> @@ -67,16 +67,16 @@ static int show_stat(struct seq_file *p, void *v)
> jif = boottime.tv_sec;
>
> for_each_possible_cpu(i) {
> - user += kstat_cpu(i).cpustat[USER];
> - nice += kstat_cpu(i).cpustat[NICE];
> - system += kstat_cpu(i).cpustat[SYSTEM];
> + user += kcpustat_cpu(i).cpustat[USER];
> + nice += kcpustat_cpu(i).cpustat[NICE];
> + system += kcpustat_cpu(i).cpustat[SYSTEM];
> idle += get_idle_time(i);
> iowait += get_iowait_time(i);
> - irq += kstat_cpu(i).cpustat[IRQ];
> - softirq += kstat_cpu(i).cpustat[SOFTIRQ];
> - steal += kstat_cpu(i).cpustat[STEAL];
> - guest += kstat_cpu(i).cpustat[GUEST];
> - guest_nice += kstat_cpu(i).cpustat[GUEST_NICE];
> + irq += kcpustat_cpu(i).cpustat[IRQ];
> + softirq += kcpustat_cpu(i).cpustat[SOFTIRQ];
> + steal += kcpustat_cpu(i).cpustat[STEAL];
> + guest += kcpustat_cpu(i).cpustat[GUEST];
> + guest_nice += kcpustat_cpu(i).cpustat[GUEST_NICE];
>
> for (j = 0; j< NR_SOFTIRQS; j++) {
> unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
> @@ -101,16 +101,16 @@ static int show_stat(struct seq_file *p, void *v)
> (unsigned long long)cputime64_to_clock_t(guest_nice));
> for_each_online_cpu(i) {
> /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
> - user = kstat_cpu(i).cpustat[USER];
> - nice = kstat_cpu(i).cpustat[NICE];
> - system = kstat_cpu(i).cpustat[SYSTEM];
> + user = kcpustat_cpu(i).cpustat[USER];
> + nice = kcpustat_cpu(i).cpustat[NICE];
> + system = kcpustat_cpu(i).cpustat[SYSTEM];
> idle = get_idle_time(i);
> iowait = get_iowait_time(i);
> - irq = kstat_cpu(i).cpustat[IRQ];
> - softirq = kstat_cpu(i).cpustat[SOFTIRQ];
> - steal = kstat_cpu(i).cpustat[STEAL];
> - guest = kstat_cpu(i).cpustat[GUEST];
> - guest_nice = kstat_cpu(i).cpustat[GUEST_NICE];
> + irq = kcpustat_cpu(i).cpustat[IRQ];
> + softirq = kcpustat_cpu(i).cpustat[SOFTIRQ];
> + steal = kcpustat_cpu(i).cpustat[STEAL];
> + guest = kcpustat_cpu(i).cpustat[GUEST];
> + guest_nice = kcpustat_cpu(i).cpustat[GUEST_NICE];
> seq_printf(p,
> "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu "
> "%llu\n",
> diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
> index 7bfd0fe..f0e31a9 100644
> --- a/include/linux/kernel_stat.h
> +++ b/include/linux/kernel_stat.h
> @@ -30,8 +30,11 @@ enum cpu_usage_stat {
> NR_STATS,
> };
>
> -struct kernel_stat {
> +struct kernel_cpustat {
> u64 cpustat[NR_STATS];
> +};
> +
> +struct kernel_stat {
> #ifndef CONFIG_GENERIC_HARDIRQS
> unsigned int irqs[NR_IRQS];
> #endif
> @@ -40,10 +43,13 @@ struct kernel_stat {
> };
>
> DECLARE_PER_CPU(struct kernel_stat, kstat);
> +DECLARE_PER_CPU(struct kernel_cpustat, kernel_cpustat);
>
> /* Must have preemption disabled for this to be meaningful. */
> #define kstat_this_cpu (&__get_cpu_var(kstat))
> +#define kcpustat_this_cpu (&__get_cpu_var(kernel_cpustat))
> #define kstat_cpu(cpu) per_cpu(kstat, cpu)
> +#define kcpustat_cpu(cpu) per_cpu(kernel_cpustat, cpu)
>
> extern unsigned long long nr_context_switches(void);
>
> diff --git a/kernel/sched.c b/kernel/sched.c
> index 7ac5aa6..efdd4d8 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -2158,7 +2158,7 @@ static void update_rq_clock_task(struct rq *rq, s64 delta)
> #ifdef CONFIG_IRQ_TIME_ACCOUNTING
> static int irqtime_account_hi_update(void)
> {
> - u64 *cpustat = kstat_this_cpu->cpustat;
> + u64 *cpustat = kcpustat_this_cpu->cpustat;
> unsigned long flags;
> u64 latest_ns;
> int ret = 0;
> @@ -2173,7 +2173,7 @@ static int irqtime_account_hi_update(void)
>
> static int irqtime_account_si_update(void)
> {
> - u64 *cpustat = kstat_this_cpu->cpustat;
> + u64 *cpustat = kcpustat_this_cpu->cpustat;
> unsigned long flags;
> u64 latest_ns;
> int ret = 0;
> @@ -3803,8 +3803,10 @@ unlock:
> #endif
>
> DEFINE_PER_CPU(struct kernel_stat, kstat);
> +DEFINE_PER_CPU(struct kernel_cpustat, kernel_cpustat);
>
> EXPORT_PER_CPU_SYMBOL(kstat);
> +EXPORT_PER_CPU_SYMBOL(kernel_cpustat);
This would want a big fat comment explaining the difference.
>
> /*
> * Return any ns on the sched_clock that have not yet been accounted in
> @@ -3866,7 +3868,7 @@ unsigned long long task_sched_runtime(struct task_struct *p)
> void account_user_time(struct task_struct *p, cputime_t cputime,
> cputime_t cputime_scaled)
> {
> - u64 *cpustat = kstat_this_cpu->cpustat;
> + u64 *cpustat = kcpustat_this_cpu->cpustat;
> u64 tmp;
>
> /* Add user time to process. */
> @@ -3897,7 +3899,7 @@ static void account_guest_time(struct task_struct *p, cputime_t cputime,
> cputime_t cputime_scaled)
> {
> u64 tmp;
> - u64 *cpustat = kstat_this_cpu->cpustat;
> + u64 *cpustat = kcpustat_this_cpu->cpustat;
>
> tmp = cputime_to_cputime64(cputime);
>
> @@ -3953,7 +3955,7 @@ void __account_system_time(struct task_struct *p, cputime_t cputime,
> void account_system_time(struct task_struct *p, int hardirq_offset,
> cputime_t cputime, cputime_t cputime_scaled)
> {
> - u64 *cpustat = kstat_this_cpu->cpustat;
> + u64 *cpustat = kcpustat_this_cpu->cpustat;
> u64 *target_cputime64;
>
> if ((p->flags& PF_VCPU)&& (irq_count() - hardirq_offset == 0)) {
> @@ -3977,7 +3979,7 @@ void account_system_time(struct task_struct *p, int hardirq_offset,
> */
> void account_steal_time(cputime_t cputime)
> {
> - u64 *cpustat = kstat_this_cpu->cpustat;
> + u64 *cpustat = kcpustat_this_cpu->cpustat;
> u64 cputime64 = cputime_to_cputime64(cputime);
>
> cpustat[STEAL] += cputime64;
> @@ -3989,7 +3991,7 @@ void account_steal_time(cputime_t cputime)
> */
> void account_idle_time(cputime_t cputime)
> {
> - u64 *cpustat = kstat_this_cpu->cpustat;
> + u64 *cpustat = kcpustat_this_cpu->cpustat;
> u64 cputime64 = cputime_to_cputime64(cputime);
> struct rq *rq = this_rq();
>
> @@ -4047,7 +4049,7 @@ static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
> {
> cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
> u64 tmp = cputime_to_cputime64(cputime_one_jiffy);
> - u64 *cpustat = kstat_this_cpu->cpustat;
> + u64 *cpustat = kcpustat_this_cpu->cpustat;
>
> if (steal_account_process_tick())
> return;
--
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