Message-ID: <4EC39DA9.4030602@parallels.com>
Date:	Wed, 16 Nov 2011 09:25:29 -0200
From:	Glauber Costa <glommer@...allels.com>
To:	Paul Turner <pjt@...gle.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 1/4] Change cpustat fields to an array.

On 11/16/2011 03:58 AM, Paul Turner wrote:
> On 11/15/2011 07:59 AM, Glauber Costa wrote:
>> This will give us a bit more flexibility to deal with the
>> fields in this structure. This is a preparation patch for
>> later patches in this series.
>>
>> 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 | 23 +++++-----
>> drivers/cpufreq/cpufreq_ondemand.c | 23 +++++-----
>> drivers/macintosh/rack-meter.c | 6 +-
>> fs/proc/stat.c | 63 +++++++++++++---------------
>> fs/proc/uptime.c | 4 +-
>> include/linux/kernel_stat.h | 30 +++++++------
>> kernel/sched.c | 71 ++++++++++++++++----------------
>> 9 files changed, 117 insertions(+), 121 deletions(-)
>>
>> diff --git a/arch/s390/appldata/appldata_os.c
>> b/arch/s390/appldata/appldata_os.c
>> index 92f1cb7..3d6b672 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(kstat_cpu(i).cpustat[USER]);
>> os_data->os_cpu[j].per_cpu_nice =
>> - cputime_to_jiffies(kstat_cpu(i).cpustat.nice);
>> + cputime_to_jiffies(kstat_cpu(i).cpustat[NICE]);
>> os_data->os_cpu[j].per_cpu_system =
>> - cputime_to_jiffies(kstat_cpu(i).cpustat.system);
>> + cputime_to_jiffies(kstat_cpu(i).cpustat[SYSTEM]);
>> os_data->os_cpu[j].per_cpu_idle =
>> - cputime_to_jiffies(kstat_cpu(i).cpustat.idle);
>> + cputime_to_jiffies(kstat_cpu(i).cpustat[IDLE]);
>> os_data->os_cpu[j].per_cpu_irq =
>> - cputime_to_jiffies(kstat_cpu(i).cpustat.irq);
>> + cputime_to_jiffies(kstat_cpu(i).cpustat[IRQ]);
>> os_data->os_cpu[j].per_cpu_softirq =
>> - cputime_to_jiffies(kstat_cpu(i).cpustat.softirq);
>> + cputime_to_jiffies(kstat_cpu(i).cpustat[SOFTIRQ]);
>> os_data->os_cpu[j].per_cpu_iowait =
>> - cputime_to_jiffies(kstat_cpu(i).cpustat.iowait);
>> + cputime_to_jiffies(kstat_cpu(i).cpustat[IOWAIT]);
>> os_data->os_cpu[j].per_cpu_steal =
>> - cputime_to_jiffies(kstat_cpu(i).cpustat.steal);
>> + cputime_to_jiffies(kstat_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 c9e09ea..56fa4d7 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 (kstat_cpu(0).cpustat[USER])
>> #endif
>>
>> /*
>> diff --git a/drivers/cpufreq/cpufreq_conservative.c
>> b/drivers/cpufreq/cpufreq_conservative.c
>> index c97b468..2ab538f 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(kstat_cpu(cpu).cpustat[USER],
>> + kstat_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, 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]);
>>
>> 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 = kstat_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(kstat_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 = kstat_cpu(j).cpustat[NICE];
>> idle_time += jiffies_to_usecs(cur_nice_jiffies);
>> }
>>
>> @@ -501,10 +501,9 @@ static int cpufreq_governor_dbs(struct
>> cpufreq_policy *policy,
>>
>> j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
>> &j_dbs_info->prev_cpu_wall);
>> - if (dbs_tuners_ins.ignore_nice) {
>> + if (dbs_tuners_ins.ignore_nice)
>> j_dbs_info->prev_cpu_nice =
>> - kstat_cpu(j).cpustat.nice;
>> - }
>> + kstat_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 fa8af4e..45d8e17 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(kstat_cpu(cpu).cpustat[USER],
>> + kstat_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, 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]);
>>
>> 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 = kstat_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(kstat_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 = kstat_cpu(j).cpustat[NICE];
>> idle_time += jiffies_to_usecs(cur_nice_jiffies);
>> }
>>
>> @@ -646,10 +646,9 @@ static int cpufreq_governor_dbs(struct
>> cpufreq_policy *policy,
>>
>> j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
>> &j_dbs_info->prev_cpu_wall);
>> - if (dbs_tuners_ins.ignore_nice) {
>> + if (dbs_tuners_ins.ignore_nice)
>> j_dbs_info->prev_cpu_nice =
>> - kstat_cpu(j).cpustat.nice;
>> - }
>> + kstat_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 2637c13..c80e49a 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(kstat_cpu(cpu).cpustat[IDLE],
>> + kstat_cpu(cpu).cpustat[IOWAIT]);
>>
>> if (rackmeter_ignore_nice)
>> - retval = cputime64_add(retval, kstat_cpu(cpu).cpustat.nice);
>> + retval = cputime64_add(retval, kstat_cpu(cpu).cpustat[NICE]);
>>
>> return retval;
>> }
>> diff --git a/fs/proc/stat.c b/fs/proc/stat.c
>> index 42b274d..b7b74ad 100644
>> --- a/fs/proc/stat.c
>> +++ b/fs/proc/stat.c
>> @@ -22,29 +22,27 @@
>> #define arch_idle_time(cpu) 0
>> #endif
>>
>> -static cputime64_t get_idle_time(int cpu)
>> +static u64 get_idle_time(int cpu)
>> {
>> - u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
>> - cputime64_t idle;
>> + u64 idle, idle_time = get_cpu_idle_time_us(cpu, NULL);
>>
>> if (idle_time == -1ULL) {
>> /* !NO_HZ so we can rely on cpustat.idle */
>> - idle = kstat_cpu(cpu).cpustat.idle;
>> - idle = cputime64_add(idle, arch_idle_time(cpu));
>> + idle = kstat_cpu(cpu).cpustat[IDLE];
>> + idle += arch_idle_time(cpu);
>> } else
>> idle = usecs_to_cputime(idle_time);
>>
>> return idle;
>> }
>>
>> -static cputime64_t get_iowait_time(int cpu)
>> +static u64 get_iowait_time(int cpu)
>> {
>> - u64 iowait_time = get_cpu_iowait_time_us(cpu, NULL);
>> - cputime64_t iowait;
>> + u64 iowait, iowait_time = get_cpu_iowait_time_us(cpu, NULL);
>>
>> if (iowait_time == -1ULL)
>> /* !NO_HZ so we can rely on cpustat.iowait */
>> - iowait = kstat_cpu(cpu).cpustat.iowait;
>> + iowait = kstat_cpu(cpu).cpustat[IOWAIT];
>> else
>> iowait = usecs_to_cputime(iowait_time);
>>
>> @@ -55,33 +53,30 @@ static int show_stat(struct seq_file *p, void *v)
>> {
>> int i, j;
>> unsigned long jif;
>> - cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
>> - cputime64_t guest, guest_nice;
>> + u64 user, nice, system, idle, iowait, irq, softirq, steal;
>> + u64 guest, guest_nice;
>> u64 sum = 0;
>> u64 sum_softirq = 0;
>> unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
>> struct timespec boottime;
>>
>> user = nice = system = idle = iowait =
>> - irq = softirq = steal = cputime64_zero;
>> - guest = guest_nice = cputime64_zero;
>> + irq = softirq = steal = 0;
>> + guest = guest_nice = 0;
>> getboottime(&boottime);
>> jif = boottime.tv_sec;
>>
>> for_each_possible_cpu(i) {
>> - user = cputime64_add(user, kstat_cpu(i).cpustat.user);
>> - nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
>> - system = cputime64_add(system, kstat_cpu(i).cpustat.system);
>> - idle = cputime64_add(idle, get_idle_time(i));
>> - iowait = cputime64_add(iowait, get_iowait_time(i));
>> - irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
>> - softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
>> - steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
>> - guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
>> - guest_nice = cputime64_add(guest_nice,
>> - kstat_cpu(i).cpustat.guest_nice);
>> - sum += kstat_cpu_irqs_sum(i);
>> - sum += arch_irq_stat_cpu(i);
>> + user += kstat_cpu(i).cpustat[USER];
>
> Half the time cputime64_add is preserved, half the time this patch
> converts it to a naked '+='. Admittedly no one seems to usefully define
> cputime64_add but why the conversion / inconsistency?

Because at least in this patchset of mine, cputime conversion is not a 
goal, but a side effect. I wanted cpustat to be an array of u64, so I 
converted users. There are some places in the code that still uses 
cputime64 for other variables, and those I kept untouched.

That's to make the patch focused. The other variables can be easily 
converted if we see value on it.

>> + nice += kstat_cpu(i).cpustat[NICE];
>> + system += kstat_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];
>>
>> for (j = 0; j< NR_SOFTIRQS; j++) {
>> unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
>> @@ -106,16 +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 = kstat_cpu(i).cpustat[USER];
>> + nice = kstat_cpu(i).cpustat[NICE];
>> + system = kstat_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 = 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];
>> seq_printf(p,
>> "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu "
>> "%llu\n",
>> diff --git a/fs/proc/uptime.c b/fs/proc/uptime.c
>> index 766b1d4..76737bc 100644
>> --- a/fs/proc/uptime.c
>> +++ b/fs/proc/uptime.c
>> @@ -12,10 +12,10 @@ static int uptime_proc_show(struct seq_file *m,
>> void *v)
>> struct timespec uptime;
>> struct timespec idle;
>> int i;
>> - cputime_t idletime = cputime_zero;
>> + u64 idletime = 0;
>>
>> for_each_possible_cpu(i)
>> - idletime = cputime64_add(idletime, kstat_cpu(i).cpustat.idle);
>> + idletime += kstat_cpu(i).cpustat[IDLE];
>>
>> do_posix_clock_monotonic_gettime(&uptime);
>> monotonic_to_bootbased(&uptime);
>> diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
>> index 0cce2db..7bfd0fe 100644
>> --- a/include/linux/kernel_stat.h
>> +++ b/include/linux/kernel_stat.h
>> @@ -6,6 +6,7 @@
>> #include<linux/percpu.h>
>> #include<linux/cpumask.h>
>> #include<linux/interrupt.h>
>> +#include<linux/sched.h>
>> #include<asm/irq.h>
>> #include<asm/cputime.h>
>>
>> @@ -15,21 +16,22 @@
>> * used by rstatd/perfmeter
>> */
>>
>> -struct cpu_usage_stat {
>> - cputime64_t user;
>> - cputime64_t nice;
>> - cputime64_t system;
>> - cputime64_t softirq;
>> - cputime64_t irq;
>> - cputime64_t idle;
>> - cputime64_t iowait;
>> - cputime64_t steal;
>> - cputime64_t guest;
>> - cputime64_t guest_nice;
>> +enum cpu_usage_stat {
>> + USER,
>> + NICE,
>> + SYSTEM,
>> + SOFTIRQ,
>> + IRQ,
>> + IDLE,
>> + IOWAIT,
>> + STEAL,
>> + GUEST,
>> + GUEST_NICE,
>> + NR_STATS,
>> };
>
> I suspect we want a more descriptive prefix here, e.g. CPUTIME_USER
>
>>
>> struct kernel_stat {
>> - struct cpu_usage_stat cpustat;
>> + u64 cpustat[NR_STATS];
>> #ifndef CONFIG_GENERIC_HARDIRQS
>> unsigned int irqs[NR_IRQS];
>> #endif
>> @@ -39,9 +41,9 @@ struct kernel_stat {
>>
>> DECLARE_PER_CPU(struct kernel_stat, kstat);
>>
>> -#define kstat_cpu(cpu) per_cpu(kstat, cpu)
>> /* Must have preemption disabled for this to be meaningful. */
>> -#define kstat_this_cpu __get_cpu_var(kstat)
>> +#define kstat_this_cpu (&__get_cpu_var(kstat))
>> +#define kstat_cpu(cpu) per_cpu(kstat, cpu)
>>
>> extern unsigned long long nr_context_switches(void);
>>
>> diff --git a/kernel/sched.c b/kernel/sched.c
>> index 594ea22..7ac5aa6 100644
>> --- a/kernel/sched.c
>> +++ b/kernel/sched.c
>> @@ -2158,14 +2158,14 @@ static void update_rq_clock_task(struct rq
>> *rq, s64 delta)
>> #ifdef CONFIG_IRQ_TIME_ACCOUNTING
>> static int irqtime_account_hi_update(void)
>> {
>> - struct cpu_usage_stat *cpustat =&kstat_this_cpu.cpustat;
>> + u64 *cpustat = kstat_this_cpu->cpustat;
>> unsigned long flags;
>> u64 latest_ns;
>> int ret = 0;
>>
>> local_irq_save(flags);
>> latest_ns = this_cpu_read(cpu_hardirq_time);
>> - if (cputime64_gt(nsecs_to_cputime64(latest_ns), cpustat->irq))
>> + if (cputime64_gt(nsecs_to_cputime64(latest_ns), cpustat[IRQ]))
>> ret = 1;
>> local_irq_restore(flags);
>> return ret;
>> @@ -2173,14 +2173,14 @@ static int irqtime_account_hi_update(void)
>>
>> static int irqtime_account_si_update(void)
>> {
>> - struct cpu_usage_stat *cpustat =&kstat_this_cpu.cpustat;
>> + u64 *cpustat = kstat_this_cpu->cpustat;
>> unsigned long flags;
>> u64 latest_ns;
>> int ret = 0;
>>
>> local_irq_save(flags);
>> latest_ns = this_cpu_read(cpu_softirq_time);
>> - if (cputime64_gt(nsecs_to_cputime64(latest_ns), cpustat->softirq))
>> + if (cputime64_gt(nsecs_to_cputime64(latest_ns), cpustat[SOFTIRQ]))
>> ret = 1;
>> local_irq_restore(flags);
>> return ret;
>> @@ -3866,8 +3866,8 @@ 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)
>> {
>> - struct cpu_usage_stat *cpustat =&kstat_this_cpu.cpustat;
>> - cputime64_t tmp;
>> + u64 *cpustat = kstat_this_cpu->cpustat;
>> + u64 tmp;
>>
>> /* Add user time to process. */
>> p->utime = cputime_add(p->utime, cputime);
>> @@ -3876,10 +3876,11 @@ void account_user_time(struct task_struct *p,
>> cputime_t cputime,
>>
>> /* Add user time to cpustat. */
>> tmp = cputime_to_cputime64(cputime);
>> +
>> if (TASK_NICE(p)> 0)
>
> We now that these are actually fields this could be:
> field = TASK_NICE(p) > 0 ? CPUTIME_NICE : CPUTIME_USER;
>
>> - cpustat->nice = cputime64_add(cpustat->nice, tmp);
>> + cpustat[NICE] += tmp;
>> else
>> - cpustat->user = cputime64_add(cpustat->user, tmp);
>> + cpustat[USER] += tmp;
>>
>> cpuacct_update_stats(p, CPUACCT_STAT_USER, cputime);
>> /* Account for user time used */
>> @@ -3895,8 +3896,8 @@ void account_user_time(struct task_struct *p,
>> cputime_t cputime,
>> static void account_guest_time(struct task_struct *p, cputime_t cputime,
>> cputime_t cputime_scaled)
>> {
>> - cputime64_t tmp;
>> - struct cpu_usage_stat *cpustat =&kstat_this_cpu.cpustat;
>> + u64 tmp;
>> + u64 *cpustat = kstat_this_cpu->cpustat;
>>
>> tmp = cputime_to_cputime64(cputime);
>>
>> @@ -3908,11 +3909,11 @@ static void account_guest_time(struct
>> task_struct *p, cputime_t cputime,
>>
>> /* Add guest time to cpustat. */
>> if (TASK_NICE(p)> 0) {
>> - cpustat->nice = cputime64_add(cpustat->nice, tmp);
>> - cpustat->guest_nice = cputime64_add(cpustat->guest_nice, tmp);
>> + cpustat[NICE] += tmp;
>> + cpustat[GUEST_NICE] += tmp;
>> } else {
>> - cpustat->user = cputime64_add(cpustat->user, tmp);
>> - cpustat->guest = cputime64_add(cpustat->guest, tmp);
>> + cpustat[USER] += tmp;
>> + cpustat[GUEST] += tmp;
>> }
>> }
>>
>> @@ -3925,9 +3926,9 @@ static void account_guest_time(struct
>> task_struct *p, cputime_t cputime,
>> */
>> static inline
>> void __account_system_time(struct task_struct *p, cputime_t cputime,
>> - cputime_t cputime_scaled, cputime64_t *target_cputime64)
>> + cputime_t cputime_scaled, u64 *target_cputime64)
>
> Having cpustat be an array means we can drop the pointer here and pass
> the id.
>
>> {
>> - cputime64_t tmp = cputime_to_cputime64(cputime);
>> + u64 tmp = cputime_to_cputime64(cputime);
>>
>> /* Add system time to process. */
>> p->stime = cputime_add(p->stime, cputime);
>> @@ -3935,7 +3936,7 @@ void __account_system_time(struct task_struct
>> *p, cputime_t cputime,
>> account_group_system_time(p, cputime);
>>
>> /* Add system time to cpustat. */
>> - *target_cputime64 = cputime64_add(*target_cputime64, tmp);
>> + *target_cputime64 += tmp;
>> cpuacct_update_stats(p, CPUACCT_STAT_SYSTEM, cputime);
>>
>> /* Account for system time used */
>> @@ -3952,8 +3953,8 @@ 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)
>> {
>> - struct cpu_usage_stat *cpustat =&kstat_this_cpu.cpustat;
>> - cputime64_t *target_cputime64;
>> + u64 *cpustat = kstat_this_cpu->cpustat;
>> + u64 *target_cputime64;
>>
>> if ((p->flags& PF_VCPU)&& (irq_count() - hardirq_offset == 0)) {
>> account_guest_time(p, cputime, cputime_scaled);
>> @@ -3961,11 +3962,11 @@ void account_system_time(struct task_struct
>> *p, int hardirq_offset,
>> }
>>
>> if (hardirq_count() - hardirq_offset)
>> - target_cputime64 =&cpustat->irq;
>> + target_cputime64 =&cpustat[IRQ];
>> else if (in_serving_softirq())
>> - target_cputime64 =&cpustat->softirq;
>> + target_cputime64 =&cpustat[SOFTIRQ];
>> else
>> - target_cputime64 =&cpustat->system;
>> + target_cputime64 =&cpustat[SYSTEM];
>>
>> __account_system_time(p, cputime, cputime_scaled, target_cputime64);
>> }
>> @@ -3976,10 +3977,10 @@ void account_system_time(struct task_struct
>> *p, int hardirq_offset,
>> */
>> void account_steal_time(cputime_t cputime)
>> {
>> - struct cpu_usage_stat *cpustat =&kstat_this_cpu.cpustat;
>> - cputime64_t cputime64 = cputime_to_cputime64(cputime);
>> + u64 *cpustat = kstat_this_cpu->cpustat;
>> + u64 cputime64 = cputime_to_cputime64(cputime);
>>
>> - cpustat->steal = cputime64_add(cpustat->steal, cputime64);
>> + cpustat[STEAL] += cputime64;
>> }
>>
>> /*
>> @@ -3988,14 +3989,14 @@ void account_steal_time(cputime_t cputime)
>> */
>> void account_idle_time(cputime_t cputime)
>> {
>> - struct cpu_usage_stat *cpustat =&kstat_this_cpu.cpustat;
>> - cputime64_t cputime64 = cputime_to_cputime64(cputime);
>> + u64 *cpustat = kstat_this_cpu->cpustat;
>> + u64 cputime64 = cputime_to_cputime64(cputime);
>> struct rq *rq = this_rq();
>>
>> if (atomic_read(&rq->nr_iowait)> 0)
>> - cpustat->iowait = cputime64_add(cpustat->iowait, cputime64);
>> + cpustat[IOWAIT] += cputime64;
>> else
>> - cpustat->idle = cputime64_add(cpustat->idle, cputime64);
>> + cpustat[IDLE] += cputime64;
>> }
>>
>> static __always_inline bool steal_account_process_tick(void)
>> @@ -4045,16 +4046,16 @@ static void
>> irqtime_account_process_tick(struct task_struct *p, int user_tick,
>> struct rq *rq)
>> {
>> cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
>> - cputime64_t tmp = cputime_to_cputime64(cputime_one_jiffy);
>> - struct cpu_usage_stat *cpustat =&kstat_this_cpu.cpustat;
>> + u64 tmp = cputime_to_cputime64(cputime_one_jiffy);
>> + u64 *cpustat = kstat_this_cpu->cpustat;
>>
>> if (steal_account_process_tick())
>> return;
>>
>> if (irqtime_account_hi_update()) {
>> - cpustat->irq = cputime64_add(cpustat->irq, tmp);
>> + cpustat[IRQ] += tmp;
>> } else if (irqtime_account_si_update()) {
>> - cpustat->softirq = cputime64_add(cpustat->softirq, tmp);
>> + cpustat[SOFTIRQ] += tmp;
>> } else if (this_cpu_ksoftirqd() == p) {
>> /*
>> * ksoftirqd time do not get accounted in cpu_softirq_time.
>> @@ -4062,7 +4063,7 @@ static void irqtime_account_process_tick(struct
>> task_struct *p, int user_tick,
>> * Also, p->stime needs to be updated for ksoftirqd.
>> */
>> __account_system_time(p, cputime_one_jiffy, one_jiffy_scaled,
>> - &cpustat->softirq);
>> + &cpustat[SOFTIRQ]);
>> } else if (user_tick) {
>> account_user_time(p, cputime_one_jiffy, one_jiffy_scaled);
>> } else if (p == rq->idle) {
>> @@ -4071,7 +4072,7 @@ static void irqtime_account_process_tick(struct
>> task_struct *p, int user_tick,
>> account_guest_time(p, cputime_one_jiffy, one_jiffy_scaled);
>> } else {
>> __account_system_time(p, cputime_one_jiffy, one_jiffy_scaled,
>> - &cpustat->system);
>> + &cpustat[SYSTEM]);
>> }
>> }
>>
>

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