Christoph Lameter wrote:
V13->V14 - Rediff against linux-next on request of Andrew - TestSetPageLocked -> trylock_page conversion. Slab fragmentation is mainly an issue if Linux is used as a fileserver and large amounts of dentries, inodes and buffer heads accumulate. In some load situations the slabs become very sparsely populated so that a lot of memory is wasted by slabs that only contain one or a few objects. In extreme cases the performance of a machine will become sluggish since we are continually running reclaim without much succes. Slab defragmentation adds the capability to recover the memory that is wasted.
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