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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-11-23 19:51:49 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-11-24 21:08:57 +1100 |
| commit | 245ebf8e7380b3d84c0aac37fbfd9306b45a3a7a (patch) | |
| tree | c971581a1e6f91ba65b4b13eef7d6b4781f6b10d /tools/perf/scripts/python/flamegraph.py | |
| parent | KVM: PPC: Book3S HV: Don't always save PMU for guest capable of nesting (diff) | |
| download | linux-245ebf8e7380b3d84c0aac37fbfd9306b45a3a7a.tar.gz linux-245ebf8e7380b3d84c0aac37fbfd9306b45a3a7a.zip | |
powerpc/64s: Always set PMU control registers to frozen/disabled when not in use
KVM PMU management code looks for particular frozen/disabled bits in
the PMU registers so it knows whether it must clear them when coming
out of a guest or not. Setting this up helps KVM make these optimisations
without getting confused. Longer term the better approach might be to
move guest/host PMU switching to the perf subsystem.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-12-npiggin@gmail.com
Diffstat (limited to 'tools/perf/scripts/python/flamegraph.py')
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