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powerpc/64s/hash: Add stress_slb kernel boot option to increase SLB faults

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This option increases the number of SLB misses by limiting the number
of kernel SLB entries, and increased flushing of cached lookaside
information. This helps stress test difficult to hit paths in the
kernel.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Relocate the code into arch/powerpc/mm, s/torture/stress/]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200511125825.3081305-1-mpe@ellerman.id.au
This commit is contained in:
Nicholas Piggin
2020-05-11 22:58:24 +10:00
committed by Michael Ellerman
parent a0594e89c9
commit 82a1b8ed56
4 changed files with 147 additions and 44 deletions
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5
Documentation/admin-guide/kernel-parameters.txt
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@@ -871,6 +871,11 @@
can be useful when debugging issues that require an SLB
miss to occur.
stress_slb [PPC]
Limits the number of kernel SLB entries, and flushes
them frequently to increase the rate of SLB faults
on kernel addresses.
disable= [IPV6]
See Documentation/networking/ipv6.txt.