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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-11-23 19:51:44 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-11-24 21:08:57 +1100 |
| commit | 34bf08a2079fffc7206a1ae93086ab8167e0afb6 (patch) | |
| tree | 4317b21407fa968de30134a48317748a86d45d69 /arch/powerpc/kernel/time.c | |
| parent | 9581991a60817abe311c2581ae4554b28bfa32f1 (diff) | |
| download | lwn-34bf08a2079fffc7206a1ae93086ab8167e0afb6.tar.gz lwn-34bf08a2079fffc7206a1ae93086ab8167e0afb6.zip | |
KVM: PPC: Book3S HV P9: Reduce mftb per guest entry/exit
mftb is serialising (dispatch next-to-complete) so it is heavy weight
for a mfspr. Avoid reading it multiple times in the entry or exit paths.
A small number of cycles delay to timers is tolerable.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-7-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/time.c')
0 files changed, 0 insertions, 0 deletions