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| author | Fabiano Rosas <farosas@linux.ibm.com> | 2022-05-25 15:05:52 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-06-29 11:21:21 +0200 |
| commit | c3fa64c99c61d99631a8e06a6cf991c35c98ec7d (patch) | |
| tree | 674f7b86dc8e16df329865f43f132f806c648cb2 /arch/powerpc/kvm/Kconfig | |
| parent | KVM: PPC: Book3S HV: Add a new config for P8 debug timing (diff) | |
| download | linux-c3fa64c99c61d99631a8e06a6cf991c35c98ec7d.tar.xz linux-c3fa64c99c61d99631a8e06a6cf991c35c98ec7d.zip | |
KVM: PPC: Book3S HV: Decouple the debug timing from the P8 entry path
We are currently doing the timing for debug purposes of the P9 entry
path using the accumulators and terminology defined by the old entry
path for P8 machines.
Not only the "real-mode" and "napping" mentions are out of place for
the P9 Radix entry path but also we cannot change them because the
timing code is coupled to the structures defined in struct
kvm_vcpu_arch.
Add a new CONFIG_KVM_BOOK3S_HV_P9_TIMING to enable the timing code for
the P9 entry path. For now, just add the new CONFIG and duplicate the
structures. A subsequent patch will add the P9 changes.
Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220525130554.2614394-4-farosas@linux.ibm.com
Diffstat (limited to 'arch/powerpc/kvm/Kconfig')
| -rw-r--r-- | arch/powerpc/kvm/Kconfig | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig index 73f8277df7d1..191347f44731 100644 --- a/arch/powerpc/kvm/Kconfig +++ b/arch/powerpc/kvm/Kconfig @@ -130,10 +130,22 @@ config KVM_BOOK3S_64_PR config KVM_BOOK3S_HV_EXIT_TIMING bool +config KVM_BOOK3S_HV_P9_TIMING + bool "Detailed timing for the P9 entry point" + select KVM_BOOK3S_HV_EXIT_TIMING + depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS + help + Calculate time taken for each vcpu in various parts of the + code. The total, minimum and maximum times in nanoseconds + together with the number of executions are reported in debugfs in + kvm/vm#/vcpu#/timings. + + If unsure, say N. + config KVM_BOOK3S_HV_P8_TIMING bool "Detailed timing for hypervisor real-mode code (for POWER8)" select KVM_BOOK3S_HV_EXIT_TIMING - depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS + depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS && !KVM_BOOK3S_HV_P9_TIMING help Calculate time taken for each vcpu in the real-mode guest entry, exit, and interrupt handling code, plus time spent in the guest |