diff options
Diffstat (limited to 'include/linux/shrinker.h')
| -rw-r--r-- | include/linux/shrinker.h | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h index 6794490f25b2..9443cafd1969 100644 --- a/include/linux/shrinker.h +++ b/include/linux/shrinker.h @@ -12,6 +12,9 @@ struct shrink_control { gfp_t gfp_mask; + /* current node being shrunk (for NUMA aware shrinkers) */ + int nid; + /* * How many objects scan_objects should scan and try to reclaim. * This is reset before every call, so it is safe for callees @@ -26,20 +29,20 @@ struct shrink_control { */ unsigned long nr_scanned; - /* current node being shrunk (for NUMA aware shrinkers) */ - int nid; - /* current memcg being shrunk (for memcg aware shrinkers) */ struct mem_cgroup *memcg; }; #define SHRINK_STOP (~0UL) +#define SHRINK_EMPTY (~0UL - 1) /* * A callback you can register to apply pressure to ageable caches. * * @count_objects should return the number of freeable items in the cache. If - * there are no objects to free or the number of freeable items cannot be - * determined, it should return 0. No deadlock checks should be done during the + * there are no objects to free, it should return SHRINK_EMPTY, while 0 is + * returned in cases of the number of freeable items cannot be determined + * or shrinker should skip this cache for this time (e.g., their number + * is below shrinkable limit). No deadlock checks should be done during the * count callback - the shrinker relies on aggregating scan counts that couldn't * be executed due to potential deadlocks to be run at a later call when the * deadlock condition is no longer pending. @@ -60,12 +63,16 @@ struct shrinker { unsigned long (*scan_objects)(struct shrinker *, struct shrink_control *sc); - int seeks; /* seeks to recreate an obj */ long batch; /* reclaim batch size, 0 = default */ - unsigned long flags; + int seeks; /* seeks to recreate an obj */ + unsigned flags; /* These are for internal use */ struct list_head list; +#ifdef CONFIG_MEMCG_KMEM + /* ID in shrinker_idr */ + int id; +#endif /* objs pending delete, per node */ atomic_long_t *nr_deferred; }; |