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zsmalloc: always keep per-class stats 

Always account per-class `zs_size_stat' stats.  This data will help us
make better decisions during compaction.  We are especially interested
in OBJ_ALLOCATED and OBJ_USED, which can tell us if class compaction
will result in any memory gain.

For instance, we know the number of allocated objects in the class, the
number of objects being used (so we also know how many objects are not
used) and the number of objects per-page.  So we can ensure if we have
enough unused objects to form at least one ZS_EMPTY zspage during
compaction.

We calculate this value on per-class basis so we can calculate a total
number of zspages that can be released.  Which is exactly what a
shrinker wants to know.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky 2015-09-08 15:04:27 -07:00 committed by Linus Torvalds
parent b430d1fd6c
commit 5724459419
1 changed files with 8 additions and 32 deletions
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40
mm/zsmalloc.c
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@ -169,14 +169,12 @@ enum zs_stat_type {
NR_ZS_STAT_TYPE,
};
#ifdef CONFIG_ZSMALLOC_STAT
static struct dentry *zs_stat_root;
struct zs_size_stat {
unsigned long objs[NR_ZS_STAT_TYPE];
};
#ifdef CONFIG_ZSMALLOC_STAT
static struct dentry *zs_stat_root;
#endif
/*
@ -201,6 +199,8 @@ static int zs_size_classes;
static const int fullness_threshold_frac = 4;
struct size_class {
spinlock_t lock;
struct page *fullness_list[_ZS_NR_FULLNESS_GROUPS];
/*
* Size of objects stored in this class. Must be multiple
* of ZS_ALIGN.
@ -210,16 +210,10 @@ struct size_class {
/* Number of PAGE_SIZE sized pages to combine to form a 'zspage' */
int pages_per_zspage;
struct zs_size_stat stats;
/* huge object: pages_per_zspage == 1 && maxobj_per_zspage == 1 */
bool huge;
#ifdef CONFIG_ZSMALLOC_STAT
struct zs_size_stat stats;
#endif
spinlock_t lock;
struct page *fullness_list[_ZS_NR_FULLNESS_GROUPS];
};
/*
@ -441,8 +435,6 @@ static int get_size_class_index(int size)
return min(zs_size_classes - 1, idx);
}
#ifdef CONFIG_ZSMALLOC_STAT
static inline void zs_stat_inc(struct size_class *class,
enum zs_stat_type type, unsigned long cnt)
{
@ -461,6 +453,8 @@ static inline unsigned long zs_stat_get(struct size_class *class,
return class->stats.objs[type];
}
#ifdef CONFIG_ZSMALLOC_STAT
static int __init zs_stat_init(void)
{
if (!debugfs_initialized())
@ -576,23 +570,6 @@ static void zs_pool_stat_destroy(struct zs_pool *pool)
}
#else /* CONFIG_ZSMALLOC_STAT */
static inline void zs_stat_inc(struct size_class *class,
enum zs_stat_type type, unsigned long cnt)
{
}
static inline void zs_stat_dec(struct size_class *class,
enum zs_stat_type type, unsigned long cnt)
{
}
static inline unsigned long zs_stat_get(struct size_class *class,
enum zs_stat_type type)
{
return 0;
}
static int __init zs_stat_init(void)
{
return 0;
@ -610,7 +587,6 @@ static inline int zs_pool_stat_create(char *name, struct zs_pool *pool)
static inline void zs_pool_stat_destroy(struct zs_pool *pool)
{
}
#endif