![Dennis Zhou (Facebook)](/assets/img/avatar_default.png)
Prior this variable was used to manage statistics when the first chunk had a reserved region. The previous patch introduced start_offset to keep track of the offset by value rather than boolean. Therefore, has_reserved can be removed. Signed-off-by: Dennis Zhou <dennisszhou@gmail.com> Reviewed-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org>
166 lines
4 KiB
C
166 lines
4 KiB
C
#ifndef _MM_PERCPU_INTERNAL_H
|
|
#define _MM_PERCPU_INTERNAL_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/percpu.h>
|
|
|
|
struct pcpu_chunk {
|
|
#ifdef CONFIG_PERCPU_STATS
|
|
int nr_alloc; /* # of allocations */
|
|
size_t max_alloc_size; /* largest allocation size */
|
|
#endif
|
|
|
|
struct list_head list; /* linked to pcpu_slot lists */
|
|
int free_size; /* free bytes in the chunk */
|
|
int contig_hint; /* max contiguous size hint */
|
|
void *base_addr; /* base address of this chunk */
|
|
|
|
int map_used; /* # of map entries used before the sentry */
|
|
int map_alloc; /* # of map entries allocated */
|
|
int *map; /* allocation map */
|
|
struct list_head map_extend_list;/* on pcpu_map_extend_chunks */
|
|
|
|
void *data; /* chunk data */
|
|
int first_free; /* no free below this */
|
|
bool immutable; /* no [de]population allowed */
|
|
int start_offset; /* the overlap with the previous
|
|
region to have a page aligned
|
|
base_addr */
|
|
int nr_populated; /* # of populated pages */
|
|
unsigned long populated[]; /* populated bitmap */
|
|
};
|
|
|
|
extern spinlock_t pcpu_lock;
|
|
|
|
extern struct list_head *pcpu_slot;
|
|
extern int pcpu_nr_slots;
|
|
extern int pcpu_nr_empty_pop_pages;
|
|
|
|
extern struct pcpu_chunk *pcpu_first_chunk;
|
|
extern struct pcpu_chunk *pcpu_reserved_chunk;
|
|
|
|
#ifdef CONFIG_PERCPU_STATS
|
|
|
|
#include <linux/spinlock.h>
|
|
|
|
struct percpu_stats {
|
|
u64 nr_alloc; /* lifetime # of allocations */
|
|
u64 nr_dealloc; /* lifetime # of deallocations */
|
|
u64 nr_cur_alloc; /* current # of allocations */
|
|
u64 nr_max_alloc; /* max # of live allocations */
|
|
u32 nr_chunks; /* current # of live chunks */
|
|
u32 nr_max_chunks; /* max # of live chunks */
|
|
size_t min_alloc_size; /* min allocaiton size */
|
|
size_t max_alloc_size; /* max allocation size */
|
|
};
|
|
|
|
extern struct percpu_stats pcpu_stats;
|
|
extern struct pcpu_alloc_info pcpu_stats_ai;
|
|
|
|
/*
|
|
* For debug purposes. We don't care about the flexible array.
|
|
*/
|
|
static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
|
|
{
|
|
memcpy(&pcpu_stats_ai, ai, sizeof(struct pcpu_alloc_info));
|
|
|
|
/* initialize min_alloc_size to unit_size */
|
|
pcpu_stats.min_alloc_size = pcpu_stats_ai.unit_size;
|
|
}
|
|
|
|
/*
|
|
* pcpu_stats_area_alloc - increment area allocation stats
|
|
* @chunk: the location of the area being allocated
|
|
* @size: size of area to allocate in bytes
|
|
*
|
|
* CONTEXT:
|
|
* pcpu_lock.
|
|
*/
|
|
static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
|
|
{
|
|
lockdep_assert_held(&pcpu_lock);
|
|
|
|
pcpu_stats.nr_alloc++;
|
|
pcpu_stats.nr_cur_alloc++;
|
|
pcpu_stats.nr_max_alloc =
|
|
max(pcpu_stats.nr_max_alloc, pcpu_stats.nr_cur_alloc);
|
|
pcpu_stats.min_alloc_size =
|
|
min(pcpu_stats.min_alloc_size, size);
|
|
pcpu_stats.max_alloc_size =
|
|
max(pcpu_stats.max_alloc_size, size);
|
|
|
|
chunk->nr_alloc++;
|
|
chunk->max_alloc_size = max(chunk->max_alloc_size, size);
|
|
}
|
|
|
|
/*
|
|
* pcpu_stats_area_dealloc - decrement allocation stats
|
|
* @chunk: the location of the area being deallocated
|
|
*
|
|
* CONTEXT:
|
|
* pcpu_lock.
|
|
*/
|
|
static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
|
|
{
|
|
lockdep_assert_held(&pcpu_lock);
|
|
|
|
pcpu_stats.nr_dealloc++;
|
|
pcpu_stats.nr_cur_alloc--;
|
|
|
|
chunk->nr_alloc--;
|
|
}
|
|
|
|
/*
|
|
* pcpu_stats_chunk_alloc - increment chunk stats
|
|
*/
|
|
static inline void pcpu_stats_chunk_alloc(void)
|
|
{
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&pcpu_lock, flags);
|
|
|
|
pcpu_stats.nr_chunks++;
|
|
pcpu_stats.nr_max_chunks =
|
|
max(pcpu_stats.nr_max_chunks, pcpu_stats.nr_chunks);
|
|
|
|
spin_unlock_irqrestore(&pcpu_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* pcpu_stats_chunk_dealloc - decrement chunk stats
|
|
*/
|
|
static inline void pcpu_stats_chunk_dealloc(void)
|
|
{
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&pcpu_lock, flags);
|
|
|
|
pcpu_stats.nr_chunks--;
|
|
|
|
spin_unlock_irqrestore(&pcpu_lock, flags);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
|
|
{
|
|
}
|
|
|
|
static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
|
|
{
|
|
}
|
|
|
|
static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
|
|
{
|
|
}
|
|
|
|
static inline void pcpu_stats_chunk_alloc(void)
|
|
{
|
|
}
|
|
|
|
static inline void pcpu_stats_chunk_dealloc(void)
|
|
{
|
|
}
|
|
|
|
#endif /* !CONFIG_PERCPU_STATS */
|
|
|
|
#endif
|