mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
0a135ba14d
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: percpu: add __percpu sparse annotations to what's left percpu: add __percpu sparse annotations to fs percpu: add __percpu sparse annotations to core kernel subsystems local_t: Remove leftover local.h this_cpu: Remove pageset_notifier this_cpu: Page allocator conversion percpu, x86: Generic inc / dec percpu instructions local_t: Move local.h include to ringbuffer.c and ring_buffer_benchmark.c module: Use this_cpu_xx to dynamically allocate counters local_t: Remove cpu_local_xx macros percpu: refactor the code in pcpu_[de]populate_chunk() percpu: remove compile warnings caused by __verify_pcpu_ptr() percpu: make accessors check for percpu pointer in sparse percpu: add __percpu for sparse. percpu: make access macros universal percpu: remove per_cpu__ prefix.
152 lines
3.3 KiB
C
152 lines
3.3 KiB
C
#ifndef _LINUX_PERCPU_COUNTER_H
|
|
#define _LINUX_PERCPU_COUNTER_H
|
|
/*
|
|
* A simple "approximate counter" for use in ext2 and ext3 superblocks.
|
|
*
|
|
* WARNING: these things are HUGE. 4 kbytes per counter on 32-way P4.
|
|
*/
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/list.h>
|
|
#include <linux/threads.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/types.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
struct percpu_counter {
|
|
spinlock_t lock;
|
|
s64 count;
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
struct list_head list; /* All percpu_counters are on a list */
|
|
#endif
|
|
s32 __percpu *counters;
|
|
};
|
|
|
|
extern int percpu_counter_batch;
|
|
|
|
int __percpu_counter_init(struct percpu_counter *fbc, s64 amount,
|
|
struct lock_class_key *key);
|
|
|
|
#define percpu_counter_init(fbc, value) \
|
|
({ \
|
|
static struct lock_class_key __key; \
|
|
\
|
|
__percpu_counter_init(fbc, value, &__key); \
|
|
})
|
|
|
|
void percpu_counter_destroy(struct percpu_counter *fbc);
|
|
void percpu_counter_set(struct percpu_counter *fbc, s64 amount);
|
|
void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch);
|
|
s64 __percpu_counter_sum(struct percpu_counter *fbc);
|
|
|
|
static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount)
|
|
{
|
|
__percpu_counter_add(fbc, amount, percpu_counter_batch);
|
|
}
|
|
|
|
static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
|
|
{
|
|
s64 ret = __percpu_counter_sum(fbc);
|
|
return ret < 0 ? 0 : ret;
|
|
}
|
|
|
|
static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
|
|
{
|
|
return __percpu_counter_sum(fbc);
|
|
}
|
|
|
|
static inline s64 percpu_counter_read(struct percpu_counter *fbc)
|
|
{
|
|
return fbc->count;
|
|
}
|
|
|
|
/*
|
|
* It is possible for the percpu_counter_read() to return a small negative
|
|
* number for some counter which should never be negative.
|
|
*
|
|
*/
|
|
static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)
|
|
{
|
|
s64 ret = fbc->count;
|
|
|
|
barrier(); /* Prevent reloads of fbc->count */
|
|
if (ret >= 0)
|
|
return ret;
|
|
return 1;
|
|
}
|
|
|
|
#else
|
|
|
|
struct percpu_counter {
|
|
s64 count;
|
|
};
|
|
|
|
static inline int percpu_counter_init(struct percpu_counter *fbc, s64 amount)
|
|
{
|
|
fbc->count = amount;
|
|
return 0;
|
|
}
|
|
|
|
static inline void percpu_counter_destroy(struct percpu_counter *fbc)
|
|
{
|
|
}
|
|
|
|
static inline void percpu_counter_set(struct percpu_counter *fbc, s64 amount)
|
|
{
|
|
fbc->count = amount;
|
|
}
|
|
|
|
static inline void
|
|
percpu_counter_add(struct percpu_counter *fbc, s64 amount)
|
|
{
|
|
preempt_disable();
|
|
fbc->count += amount;
|
|
preempt_enable();
|
|
}
|
|
|
|
static inline void
|
|
__percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch)
|
|
{
|
|
percpu_counter_add(fbc, amount);
|
|
}
|
|
|
|
static inline s64 percpu_counter_read(struct percpu_counter *fbc)
|
|
{
|
|
return fbc->count;
|
|
}
|
|
|
|
static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)
|
|
{
|
|
return fbc->count;
|
|
}
|
|
|
|
static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
|
|
{
|
|
return percpu_counter_read_positive(fbc);
|
|
}
|
|
|
|
static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
|
|
{
|
|
return percpu_counter_read(fbc);
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|
|
|
|
static inline void percpu_counter_inc(struct percpu_counter *fbc)
|
|
{
|
|
percpu_counter_add(fbc, 1);
|
|
}
|
|
|
|
static inline void percpu_counter_dec(struct percpu_counter *fbc)
|
|
{
|
|
percpu_counter_add(fbc, -1);
|
|
}
|
|
|
|
static inline void percpu_counter_sub(struct percpu_counter *fbc, s64 amount)
|
|
{
|
|
percpu_counter_add(fbc, -amount);
|
|
}
|
|
|
|
#endif /* _LINUX_PERCPU_COUNTER_H */
|