Re: [PATCH 2/4] powerpc/pseries: Add wait interval counters to VPA
From: Fabiano Rosas <hidden>
Date: 2022-05-27 20:26:14
Nicholas Piggin [off-list ref] writes:
quoted hunk ↗ jump to hunk
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 <redacted>