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| author | Nicholas Piggin <npiggin@gmail.com> | 2022-10-24 13:01:50 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-12-02 18:04:25 +1100 |
| commit | 6b34a099faa123488b13caf704562f4dbe483fc4 (patch) | |
| tree | 288c5677f61f2573aa3b768502ce5577b353d4cb /Documentation/admin-guide | |
| parent | dfecd06bc5524517ed7737c30eaaf747338b280a (diff) | |
| download | linux-6b34a099faa123488b13caf704562f4dbe483fc4.tar.bz2 | |
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 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index a465d5242774..9f3d256529d0 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1042,6 +1042,11 @@ them frequently to increase the rate of SLB faults on kernel addresses. + stress_hpt [PPC] + Limits the number of kernel HPT entries in the hash + page table to increase the rate of hash page table + faults on kernel addresses. + disable= [IPV6] See Documentation/networking/ipv6.rst. |