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s390/hiperdispatch: Add trace events

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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>
This commit is contained in:
Mete Durlu 2024-08-12 13:39:36 +02:00 committed by Vasily Gorbik
parent c0d4ba054f
commit 1e5aa12d47
2 changed files with 63 additions and 0 deletions
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58
arch/s390/include/asm/trace/hiperdispatch.h Normal file
View File

@ -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>

5
arch/s390/kernel/hiperdispatch.c
View File

@ -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);
}