diff options
| -rw-r--r-- | include/linux/pcounter.h | 74 | ||||
| -rw-r--r-- | lib/Makefile | 1 | ||||
| -rw-r--r-- | lib/pcounter.c | 58 |
3 files changed, 0 insertions, 133 deletions
diff --git a/include/linux/pcounter.h b/include/linux/pcounter.h deleted file mode 100644 index a82d9f2..0000000 --- a/include/linux/pcounter.h +++ /dev/null @@ -1,74 +0,0 @@ -#ifndef __LINUX_PCOUNTER_H -#define __LINUX_PCOUNTER_H -/* - * Using a dynamic percpu 'int' variable has a cost : - * 1) Extra dereference - * Current per_cpu_ptr() implementation uses an array per 'percpu variable'. - * 2) memory cost of NR_CPUS*(32+sizeof(void *)) instead of num_possible_cpus()*4 - * - * This pcounter implementation is an abstraction to be able to use - * either a static or a dynamic per cpu variable. - * One dynamic per cpu variable gets a fast & cheap implementation, we can - * change pcounter implementation too. - */ -struct pcounter { -#ifdef CONFIG_SMP - void (*add)(struct pcounter *self, int inc); - int (*getval)(const struct pcounter *self, int cpu); - int *per_cpu_values; -#else - int val; -#endif -}; - -#ifdef CONFIG_SMP -#include <linux/percpu.h> - -#define DEFINE_PCOUNTER(NAME) \ -static DEFINE_PER_CPU(int, NAME##_pcounter_values); \ -static void NAME##_pcounter_add(struct pcounter *self, int val) \ -{ \ - __get_cpu_var(NAME##_pcounter_values) += val; \ -} \ -static int NAME##_pcounter_getval(const struct pcounter *self, int cpu) \ -{ \ - return per_cpu(NAME##_pcounter_values, cpu); \ -} \ - -#define PCOUNTER_MEMBER_INITIALIZER(NAME, MEMBER) \ - MEMBER = { \ - .add = NAME##_pcounter_add, \ - .getval = NAME##_pcounter_getval, \ - } - - -static inline void pcounter_add(struct pcounter *self, int inc) -{ - self->add(self, inc); -} - -extern int pcounter_getval(const struct pcounter *self); -extern int pcounter_alloc(struct pcounter *self); -extern void pcounter_free(struct pcounter *self); - - -#else /* CONFIG_SMP */ - -static inline void pcounter_add(struct pcounter *self, int inc) -{ - self->val += inc; -} - -static inline int pcounter_getval(const struct pcounter *self) -{ - return self->val; -} - -#define DEFINE_PCOUNTER(NAME) -#define PCOUNTER_MEMBER_INITIALIZER(NAME, MEMBER) -#define pcounter_alloc(self) 0 -#define pcounter_free(self) - -#endif /* CONFIG_SMP */ - -#endif /* __LINUX_PCOUNTER_H */ diff --git a/lib/Makefile b/lib/Makefile index 23de261..4d059d4 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -61,7 +61,6 @@ obj-$(CONFIG_TEXTSEARCH_KMP) += ts_kmp.o obj-$(CONFIG_TEXTSEARCH_BM) += ts_bm.o obj-$(CONFIG_TEXTSEARCH_FSM) += ts_fsm.o obj-$(CONFIG_SMP) += percpu_counter.o -obj-$(CONFIG_SMP) += pcounter.o obj-$(CONFIG_AUDIT_GENERIC) += audit.o obj-$(CONFIG_SWIOTLB) += swiotlb.o diff --git a/lib/pcounter.c b/lib/pcounter.c deleted file mode 100644 index 9b56807..0000000 --- a/lib/pcounter.c +++ /dev/null @@ -1,58 +0,0 @@ -/* - * Define default pcounter functions - * Note that often used pcounters use dedicated functions to get a speed increase. - * (see DEFINE_PCOUNTER/REF_PCOUNTER_MEMBER) - */ - -#include <linux/module.h> -#include <linux/pcounter.h> -#include <linux/smp.h> -#include <linux/cpumask.h> - -static void pcounter_dyn_add(struct pcounter *self, int inc) -{ - per_cpu_ptr(self->per_cpu_values, smp_processor_id())[0] += inc; -} - -static int pcounter_dyn_getval(const struct pcounter *self, int cpu) -{ - return per_cpu_ptr(self->per_cpu_values, cpu)[0]; -} - -int pcounter_getval(const struct pcounter *self) -{ - int res = 0, cpu; - - for_each_possible_cpu(cpu) - res += self->getval(self, cpu); - - return res; -} -EXPORT_SYMBOL_GPL(pcounter_getval); - -int pcounter_alloc(struct pcounter *self) -{ - int rc = 0; - if (self->add == NULL) { - self->per_cpu_values = alloc_percpu(int); - if (self->per_cpu_values != NULL) { - self->add = pcounter_dyn_add; - self->getval = pcounter_dyn_getval; - } else - rc = 1; - } - return rc; -} -EXPORT_SYMBOL_GPL(pcounter_alloc); - -void pcounter_free(struct pcounter *self) -{ - if (self->per_cpu_values != NULL) { - free_percpu(self->per_cpu_values); - self->per_cpu_values = NULL; - self->getval = NULL; - self->add = NULL; - } -} -EXPORT_SYMBOL_GPL(pcounter_free); - |