[PATCH] shrink_slab: improved handling of GFP_NOFS allocations
Currently, shrink_slab() will decide that it needs to scan a certain number of dentries, will call shrink_dcache_memory() requesting that this be done, and shrink_dcache_memory() will simply bale out without doing anything because the caller did not have __GFP_FS. This has the potential to disrupt our lovely pagecache-vs-slab balancing act. So change things so that shrinker callouts can return -1, indicating that they baled out. This way, shrink_slab can remember that this slab was owed a certain number of scannings and these will be correctly performed next time a __GFP_FS caller comes by.
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