debugobjects: delay free of internal objects
Impact: avoid recursive kfree calls, less slab activity on heavy load
debugobjects checks on kfree whether tracked objects are freed. When a
tracked object is freed debugobjects frees the internal reference
object as well. The debug object slab cache is marked to not recurse
into debugobjects when a slab objects is freed, but the recursive call
can be problematic versus locking in the memory allocator.
Defer the freeing of debug slab objects via schedule_work. The reasons
not to use RCU are:
1) rcu makes the data structure larger
2) there is no real need for rcu as nothing references the obj after
we freed it
3) under heavy load it is easier to reuse the to be freed objects instead
of allocating new objects from the slab. This lowered the slab activity
significantly in a heavy load networking test where lots of timers are
created/destroyed. The workqueue based delayed free allows us just to
put the to be freed objects back into the object pool and reuse them
right away.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <200903162049.58058.nickpiggin@yahoo.com.au>
1 file changed