2010-05-25 Rodrigo Kumpera <rkumpera@novell.com>

2010-05-25 Rodrigo Kumpera  <rkumpera@novell.com>

	* sgen-gc.c (search_fragment_for_size): Move fragment setup into
	a separate function called setup_fragment.

	* sgen-gc.c (search_fragment_for_size_range): Variant of
	search_fragment_for_size that does search for a secondary smaller
	size.

	* sgen-gc.c (mono_gc_alloc_obj_nolock): Use search_fragment_for_size_range
	for tlab allocation so small fragments are used.

	This patch uses small fragments for tlab allocation when possible in order
	to improve nursery utilization. With a fixed size tlab this patch is not very
	usefull but once size gets dynamically adjusted, this will be invaluable.

	Performance under pystone 500k is unchanged. Nursery utilization improves by
	3.5% and 18 more fragments are used per minor GC.

	Performance under modified binary-tree is unchanged. Nursery utilization
	improves by 0.5% and 3 more fragments are used per minor GC.

	These numbers make sense since as more pinning happens, more fragments are
	created and so are the chances of having a bunch of small ones.

git-svn-id: svn+ssh://mono-cvs.ximian.com/source/trunk/mono@157998 e3ebcda4-bce8-0310-ba0a-eca2169e7518