first half of new slab automover

If any slab classes have more than two pages worth of free chunks, attempt to
free one page back to a global pool.

Create new concept of a slab page move destination of "0", which is a global
page pool. Pages can be re-assigned out of that pool during allocation.

Combined with item rescuing from the previous patch, we can safely shuffle
pages back to the reassignment pool as chunks free up naturally. This should
be a safe default going forward. Users should be able to decide to free or
move pages based on eviction pressure as well. This is coming up in another
commit.

This also fixes a calculation of the NOEXP LRU size, and completely removes
the old slab automover thread. Slab automove decisions will now be part of the
lru maintainer thread.

1 files changed, 1 insertions, 1 deletions

diff --git a/slabs.h b/slabs.h
index 1eac5c8..fb29cfa 100644
--- a/slabs.h
+++ b/slabs.h
@@ -34,7 +34,7 @@ bool get_stats(const char *stat_type, int nkey, ADD_STAT add_stats, void *c);
 void slabs_stats(ADD_STAT add_stats, void *c);
 
 /* Hints as to freespace in slab class */
-unsigned int slabs_available_chunks(unsigned int id, bool *mem_flag, unsigned int *total_chunks);
+unsigned int slabs_available_chunks(unsigned int id, bool *mem_flag, unsigned int *total_chunks, unsigned int *chunks_perslab);
 
 int start_slab_maintenance_thread(void);
 void stop_slab_maintenance_thread(void);