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author | Nicholas Piggin <npiggin@gmail.com> | 2022-10-24 06:01:50 +0300 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-12-02 10:04:25 +0300 |
commit | 6b34a099faa123488b13caf704562f4dbe483fc4 (patch) | |
tree | 288c5677f61f2573aa3b768502ce5577b353d4cb /tools/testing/selftests/powerpc | |
parent | dfecd06bc5524517ed7737c30eaaf747338b280a (diff) | |
download | linux-6b34a099faa123488b13caf704562f4dbe483fc4.tar.xz |
powerpc/64s/hash: add stress_hpt kernel boot option to increase hash faults
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
Diffstat (limited to 'tools/testing/selftests/powerpc')
0 files changed, 0 insertions, 0 deletions