[PATCH] fix stolen time for SMT without LPAR
From: Michael Neuling <hidden>
Date: 2007-05-24 13:33:22
For POWERPC, stolen time accounts for cycles lost to the hypervisor or PURR cycles attributed to the other SMT thread. Hence, when a PURR is available, we should still calculate stolen time, irrespective of being virtualised. Signed-off-by: Michael Neuling <redacted> --- Kudos to sfr for realizing the problem here. arch/powerpc/kernel/time.c | 6 ++++-- include/asm-powerpc/time.h | 2 +- 2 files changed, 5 insertions(+), 3 deletions(-) Index: linux-2.6-ozlabs/arch/powerpc/kernel/time.c ===================================================================
--- linux-2.6-ozlabs.orig/arch/powerpc/kernel/time.c
+++ linux-2.6-ozlabs/arch/powerpc/kernel/time.c@@ -244,7 +244,8 @@ void snapshot_timebases(void) { int cpu; - if (!cpu_has_feature(CPU_FTR_PURR)) + if (!cpu_has_feature(CPU_FTR_PURR) && + !firmware_has_feature(FW_FEATURE_SPLPAR)) return; for_each_possible_cpu(cpu) spin_lock_init(&per_cpu(cpu_purr_data, cpu).lock);
@@ -257,7 +258,8 @@ void calculate_steal_time(void) s64 stolen; struct cpu_purr_data *pme; - if (!cpu_has_feature(CPU_FTR_PURR)) + if (!cpu_has_feature(CPU_FTR_PURR) && + !firmware_has_feature(FW_FEATURE_SPLPAR)) return; pme = &per_cpu(cpu_purr_data, smp_processor_id()); if (!pme->initialized)
Index: linux-2.6-ozlabs/include/asm-powerpc/time.h ===================================================================
--- linux-2.6-ozlabs.orig/include/asm-powerpc/time.h
+++ linux-2.6-ozlabs/include/asm-powerpc/time.h@@ -232,7 +232,7 @@ extern void account_process_vtime(struct #define account_process_vtime(tsk) do { } while (0) #endif -#if defined(CONFIG_VIRT_CPU_ACCOUNTING) && defined(CONFIG_PPC_SPLPAR) +#if defined(CONFIG_VIRT_CPU_ACCOUNTING) extern void calculate_steal_time(void); extern void snapshot_timebases(void); #else