mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-11-01 02:21:16 +00:00
6c9ae009b2
Use modern per_cpu API to increment {soft|hard}irq counters, and use
per_cpu allocation for (struct irq_desc)->kstats_irq instead of an array.
This gives better SMP/NUMA locality and saves few instructions per irq.
With small nr_cpuids values (8 for example), kstats_irq was a small array
(less than L1_CACHE_BYTES), potentially source of false sharing.
In the !CONFIG_SPARSE_IRQ case, remove the huge, NUMA/cache unfriendly
kstat_irqs_all[NR_IRQS][NR_CPUS] array.
Note: we still populate kstats_irq for all possible irqs in
early_irq_init(). We probably could use on-demand allocations. (Code
included in alloc_descs()). Problem is not all IRQS are used with a prior
alloc_descs() call.
kstat_irqs_this_cpu() is not used anymore, remove it.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Reviewed-by: Christoph Lameter <cl@linux.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
#ifndef _LINUX_KERNEL_STAT_H
|
|
#define _LINUX_KERNEL_STAT_H
|
|
|
|
#include <linux/smp.h>
|
|
#include <linux/threads.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/interrupt.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/cputime.h>
|
|
|
|
/*
|
|
* 'kernel_stat.h' contains the definitions needed for doing
|
|
* some kernel statistics (CPU usage, context switches ...),
|
|
* 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;
|
|
};
|
|
|
|
struct kernel_stat {
|
|
struct cpu_usage_stat cpustat;
|
|
#ifndef CONFIG_GENERIC_HARDIRQS
|
|
unsigned int irqs[NR_IRQS];
|
|
#endif
|
|
unsigned long irqs_sum;
|
|
unsigned int softirqs[NR_SOFTIRQS];
|
|
};
|
|
|
|
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)
|
|
|
|
extern unsigned long long nr_context_switches(void);
|
|
|
|
#ifndef CONFIG_GENERIC_HARDIRQS
|
|
|
|
struct irq_desc;
|
|
|
|
static inline void kstat_incr_irqs_this_cpu(unsigned int irq,
|
|
struct irq_desc *desc)
|
|
{
|
|
__this_cpu_inc(kstat.irqs[irq]);
|
|
__this_cpu_inc(kstat.irqs_sum);
|
|
}
|
|
|
|
static inline unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
|
|
{
|
|
return kstat_cpu(cpu).irqs[irq];
|
|
}
|
|
#else
|
|
#include <linux/irq.h>
|
|
extern unsigned int kstat_irqs_cpu(unsigned int irq, int cpu);
|
|
|
|
#define kstat_incr_irqs_this_cpu(irqno, DESC) \
|
|
do { \
|
|
__this_cpu_inc(*(DESC)->kstat_irqs); \
|
|
__this_cpu_inc(kstat.irqs_sum); \
|
|
} while (0)
|
|
|
|
#endif
|
|
|
|
static inline void kstat_incr_softirqs_this_cpu(unsigned int irq)
|
|
{
|
|
__this_cpu_inc(kstat.softirqs[irq]);
|
|
}
|
|
|
|
static inline unsigned int kstat_softirqs_cpu(unsigned int irq, int cpu)
|
|
{
|
|
return kstat_cpu(cpu).softirqs[irq];
|
|
}
|
|
|
|
/*
|
|
* Number of interrupts per specific IRQ source, since bootup
|
|
*/
|
|
#ifndef CONFIG_GENERIC_HARDIRQS
|
|
static inline unsigned int kstat_irqs(unsigned int irq)
|
|
{
|
|
unsigned int sum = 0;
|
|
int cpu;
|
|
|
|
for_each_possible_cpu(cpu)
|
|
sum += kstat_irqs_cpu(irq, cpu);
|
|
|
|
return sum;
|
|
}
|
|
#else
|
|
extern unsigned int kstat_irqs(unsigned int irq);
|
|
#endif
|
|
|
|
/*
|
|
* Number of interrupts per cpu, since bootup
|
|
*/
|
|
static inline unsigned int kstat_cpu_irqs_sum(unsigned int cpu)
|
|
{
|
|
return kstat_cpu(cpu).irqs_sum;
|
|
}
|
|
|
|
/*
|
|
* Lock/unlock the current runqueue - to extract task statistics:
|
|
*/
|
|
extern unsigned long long task_delta_exec(struct task_struct *);
|
|
|
|
extern void account_user_time(struct task_struct *, cputime_t, cputime_t);
|
|
extern void account_system_time(struct task_struct *, int, cputime_t, cputime_t);
|
|
extern void account_steal_time(cputime_t);
|
|
extern void account_idle_time(cputime_t);
|
|
|
|
extern void account_process_tick(struct task_struct *, int user);
|
|
extern void account_steal_ticks(unsigned long ticks);
|
|
extern void account_idle_ticks(unsigned long ticks);
|
|
|
|
#endif /* _LINUX_KERNEL_STAT_H */
|