| Message ID | 20220518133935.3878954-2-npiggin@gmail.com (mailing list archive) |
|---|---|
| State | Changes Requested |
| Headers | show |
| Series | [1/4] KVM: PPC: Book3S HV P9: Restore stolen time logging in dtl | expand |
Nicholas Piggin <npiggin@gmail.com> writes: > The hypervisor exposes accumulated partition scheduling interval times > in the VPA (lppaca). These can be used to implement a simple stolen time > in the guest without complex and costly dtl scanning. > > Signed-off-by: Nicholas Piggin <npiggin@gmail.com> > --- > arch/powerpc/include/asm/lppaca.h | 10 +++++++--- > 1 file changed, 7 insertions(+), 3 deletions(-) > > diff --git a/arch/powerpc/include/asm/lppaca.h b/arch/powerpc/include/asm/lppaca.h > index c390ec377bae..34d44cb17c87 100644 > --- a/arch/powerpc/include/asm/lppaca.h > +++ b/arch/powerpc/include/asm/lppaca.h > @@ -104,14 +104,18 @@ struct lppaca { > volatile __be32 dispersion_count; /* dispatch changed physical cpu */ > volatile __be64 cmo_faults; /* CMO page fault count */ > volatile __be64 cmo_fault_time; /* CMO page fault time */ > - u8 reserved10[104]; > + u8 reserved10[64]; /* [S]PURR expropriated/donated */ > + volatile __be64 enqueue_dispatch_tb; /* Total TB enqueue->dispatch */ > + volatile __be64 ready_enqueue_tb; /* Total TB ready->enqueue */ > + volatile __be64 wait_ready_tb; /* Total TB wait->ready */ This last one is unused but I assume you are adding anyway it because it could be later added to lparcfg. So: Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
diff --git a/arch/powerpc/include/asm/lppaca.h b/arch/powerpc/include/asm/lppaca.h index c390ec377bae..34d44cb17c87 100644 --- a/arch/powerpc/include/asm/lppaca.h +++ b/arch/powerpc/include/asm/lppaca.h @@ -104,14 +104,18 @@ struct lppaca { volatile __be32 dispersion_count; /* dispatch changed physical cpu */ volatile __be64 cmo_faults; /* CMO page fault count */ volatile __be64 cmo_fault_time; /* CMO page fault time */ - u8 reserved10[104]; + u8 reserved10[64]; /* [S]PURR expropriated/donated */ + volatile __be64 enqueue_dispatch_tb; /* Total TB enqueue->dispatch */ + volatile __be64 ready_enqueue_tb; /* Total TB ready->enqueue */ + volatile __be64 wait_ready_tb; /* Total TB wait->ready */ + u8 reserved11[16]; /* cacheline 4-5 */ __be32 page_ins; /* CMO Hint - # page ins by OS */ - u8 reserved11[148]; + u8 reserved12[148]; volatile __be64 dtl_idx; /* Dispatch Trace Log head index */ - u8 reserved12[96]; + u8 reserved13[96]; } ____cacheline_aligned; #define lppaca_of(cpu) (*paca_ptrs[cpu]->lppaca_ptr)
The hypervisor exposes accumulated partition scheduling interval times in the VPA (lppaca). These can be used to implement a simple stolen time in the guest without complex and costly dtl scanning. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> --- arch/powerpc/include/asm/lppaca.h | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)