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| author | Mete Durlu <meted@linux.ibm.com> | 2024-08-12 13:39:36 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2024-08-29 22:56:35 +0200 |
| commit | 1e5aa12d470b1af613fca89a3069529fa9c92cfb (patch) | |
| tree | 08e19d89ad2775d0fc2986974995d947cd855d7b /arch/s390 | |
| parent | s390/hiperdispatch: Add steal time averaging (diff) | |
| download | linux-1e5aa12d470b1af613fca89a3069529fa9c92cfb.tar.xz linux-1e5aa12d470b1af613fca89a3069529fa9c92cfb.zip | |
s390/hiperdispatch: Add trace events
Add trace events to debug hiperdispatch behavior and track domain
rebuilding. Two events provide information about the decision making of
hiperdispatch and the adjustments made.
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Co-developed-by: Tobias Huschle <huschle@linux.ibm.com>
Signed-off-by: Tobias Huschle <huschle@linux.ibm.com>
Signed-off-by: Mete Durlu <meted@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/trace/hiperdispatch.h | 58 | ||||
| -rw-r--r-- | arch/s390/kernel/hiperdispatch.c | 5 |
2 files changed, 63 insertions, 0 deletions
diff --git a/arch/s390/include/asm/trace/hiperdispatch.h b/arch/s390/include/asm/trace/hiperdispatch.h new file mode 100644 index 000000000000..46462ee645b0 --- /dev/null +++ b/arch/s390/include/asm/trace/hiperdispatch.h @@ -0,0 +1,58 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Tracepoint header for hiperdispatch + * + * Copyright IBM Corp. 2024 + */ + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM s390 + +#if !defined(_TRACE_S390_HIPERDISPATCH_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_S390_HIPERDISPATCH_H + +#include <linux/tracepoint.h> + +#undef TRACE_INCLUDE_PATH +#undef TRACE_INCLUDE_FILE + +#define TRACE_INCLUDE_PATH asm/trace +#define TRACE_INCLUDE_FILE hiperdispatch + +TRACE_EVENT(s390_hd_work_fn, + TP_PROTO(int steal_time_percentage, + int entitled_core_count, + int highcap_core_count), + TP_ARGS(steal_time_percentage, + entitled_core_count, + highcap_core_count), + TP_STRUCT__entry(__field(int, steal_time_percentage) + __field(int, entitled_core_count) + __field(int, highcap_core_count)), + TP_fast_assign(__entry->steal_time_percentage = steal_time_percentage; + __entry->entitled_core_count = entitled_core_count; + __entry->highcap_core_count = highcap_core_count;), + TP_printk("steal: %d entitled_core_count: %d highcap_core_count: %d", + __entry->steal_time_percentage, + __entry->entitled_core_count, + __entry->highcap_core_count) +); + +TRACE_EVENT(s390_hd_rebuild_domains, + TP_PROTO(int current_highcap_core_count, + int new_highcap_core_count), + TP_ARGS(current_highcap_core_count, + new_highcap_core_count), + TP_STRUCT__entry(__field(int, current_highcap_core_count) + __field(int, new_highcap_core_count)), + TP_fast_assign(__entry->current_highcap_core_count = current_highcap_core_count; + __entry->new_highcap_core_count = new_highcap_core_count), + TP_printk("change highcap_core_count: %u -> %u", + __entry->current_highcap_core_count, + __entry->new_highcap_core_count) +); + +#endif /* _TRACE_S390_HIPERDISPATCH_H */ + +/* This part must be outside protection */ +#include <trace/define_trace.h> diff --git a/arch/s390/kernel/hiperdispatch.c b/arch/s390/kernel/hiperdispatch.c index ed5b2d7d11c4..3ba7a3492924 100644 --- a/arch/s390/kernel/hiperdispatch.c +++ b/arch/s390/kernel/hiperdispatch.c @@ -53,6 +53,9 @@ #include <asm/smp.h> #include <asm/topology.h> +#define CREATE_TRACE_POINTS +#include <asm/trace/hiperdispatch.h> + #define HD_DELAY_FACTOR (4) #define HD_DELAY_INTERVAL (HZ / 4) #define HD_STEAL_THRESHOLD 30 @@ -200,9 +203,11 @@ static void hd_capacity_work_fn(struct work_struct *work) else new_cores = hd_entitled_cores; if (hd_high_capacity_cores != new_cores) { + trace_s390_hd_rebuild_domains(hd_high_capacity_cores, new_cores); hd_high_capacity_cores = new_cores; topology_schedule_update(); } + trace_s390_hd_work_fn(steal_percentage, hd_entitled_cores, hd_high_capacity_cores); mutex_unlock(&smp_cpu_state_mutex); schedule_delayed_work(&hd_capacity_work, HD_DELAY_INTERVAL); } |