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This option increases the number of hash misses by limiting the number of kernel HPT entries, by keeping a per-CPU record of the last kernel HPTEs installed, and removing that from the hash table on the next hash insertion. A timer round-robins CPUs removing remaining kernel HPTEs and clearing the TLB (in the case of bare metal) to increase and slightly randomise kernel fault activity. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> [mpe: Add comment about NR_CPUS usage, fixup whitespace] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20221024030150.852517-1-npiggin@gmail.com