From ea3e6ca9e595ebfba82b964ee2eaf1ddd7076f0f Mon Sep 17 00:00:00 2001 From: Brian Behlendorf Date: Fri, 30 Jan 2009 20:54:49 -0800 Subject: kmem_cache hardening and performance improvements - Added slab work queue task which gradually ages and free's slabs from the cache which have not been used recently. - Optimized slab packing algorithm to ensure each slab contains the maximum number of objects without create to large a slab. - Fix deadlock, we can never call kv_free() under the skc_lock. We now unlink the objects and slabs from the cache itself and attach them to a private work list. The contents of the list are then subsequently freed outside the spin lock. - Move magazine create/destroy operation on to local cpu. - Further performace optimizations by minimize the usage of the large per-cache skc_lock. This includes the addition of KMC_BIT_REAPING bit mask which is used to prevent concurrent reaping, and to defer new slab creation when reaping is occuring. - Add KMC_BIT_DESTROYING bit mask which is set when the cache is being destroyed, this is used to catch any task accessing the cache while it is being destroyed. - Add comments to all the functions and additional comments to try and make everything as clear as possible. - Major cleanup and additions to the SPLAT kmem tests to more rigerously stress the cache implementation and look for any problems. This includes correctness and performance tests. - Updated portable work queue interfaces --- include/sys/vmsystm.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'include/sys/vmsystm.h') diff --git a/include/sys/vmsystm.h b/include/sys/vmsystm.h index e92c17bdd..1cb716f13 100644 --- a/include/sys/vmsystm.h +++ b/include/sys/vmsystm.h @@ -35,8 +35,7 @@ extern vmem_t *zio_alloc_arena; /* arena for zio caches */ #define physmem num_physpages -#define freemem nr_free_pages() // Expensive on linux, - // cheap on solaris +#define freemem nr_free_pages() #define minfree 0 #define needfree 0 /* # of needed pages */ #define ptob(pages) (pages * PAGE_SIZE) -- cgit v1.2.3