#ifndef _LINUX_SHRINKER_H #define _LINUX_SHRINKER_H /* * This struct is used to pass information from page reclaim to the shrinkers. * We consolidate the values for easier extention later. * * The 'gfpmask' refers to the allocation we are currently trying to * fulfil. */ struct shrink_control { gfp_t gfp_mask; /* * How many objects scan_objects should scan and try to reclaim. * This is reset before every call, so it is safe for callees * to modify. */ unsigned long nr_to_scan; /* 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) /* * 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 * 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. * * @scan_objects will only be called if @count_objects returned a non-zero * value for the number of freeable objects. The callout should scan the cache * and attempt to free items from the cache. It should then return the number * of objects freed during the scan, or SHRINK_STOP if progress cannot be made * due to potential deadlocks. If SHRINK_STOP is returned, then no further * attempts to call the @scan_objects will be made from the current reclaim * context. * * @flags determine the shrinker abilities, like numa awareness */ struct shrinker { unsigned long (*count_objects)(struct shrinker *, struct shrink_control *sc); 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; /* These are for internal use */ struct list_head list; /* objs pending delete, per node */ atomic_long_t *nr_deferred; }; #define DEFAULT_SEEKS 2 /* A good number if you don't know better. */ /* Flags */ #define SHRINKER_NUMA_AWARE (1 << 0) #define SHRINKER_MEMCG_AWARE (1 << 1) extern int register_shrinker(struct shrinker *); extern void unregister_shrinker(struct shrinker *); #endifOverall Contributors
| Person | Tokens | Prop | Commits | CommitProp | |
| dave chinner | dave chinner | 102 | 78.46% | 3 | 50.00% |
| glauber costa | glauber costa | 17 | 13.08% | 1 | 16.67% |
| vladimir davydov | vladimir davydov | 10 | 7.69% | 1 | 16.67% |
| konstantin khlebnikov | konstantin khlebnikov | 1 | 0.77% | 1 | 16.67% |
| Total | 130 | 100.00% | 6 | 100.00% |