Nicholas Piggin 5709f7cfd8 powerpc/mm/slice: implement a slice mask cache ... Calculating the slice mask can become a signifcant overhead for get_unmapped_area. This patch adds a struct slice_mask for each page size in the mm_context, and keeps these in synch with the slices psize arrays and slb_addr_limit. On Book3S/64 this adds 288 bytes to the mm_context_t for the slice mask caches. On POWER8, this increases vfork+exec+exit performance by 9.9% and reduces time to mmap+munmap a 64kB page by 28%. Reduces time to mmap+munmap by about 10% on 8xx. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>		2018-03-13 23:43:06 +11:00
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asm	powerpc/mm/slice: implement a slice mask cache	2018-03-13 23:43:06 +11:00
uapi/asm	KVM changes for 4.16	2018-02-10 13:16:35 -08:00