Commit 1e5aa12d authored by Mete Durlu's avatar Mete Durlu Committed by Vasily Gorbik
Browse files

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: default avatarVasily Gorbik <gor@linux.ibm.com>
Co-developed-by: default avatarTobias Huschle <huschle@linux.ibm.com>
Signed-off-by: default avatarTobias Huschle <huschle@linux.ibm.com>
Signed-off-by: default avatarMete Durlu <meted@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent c0d4ba05

arch/s390/include/asm/trace/hiperdispatch.h

0 → 100644
+58 −0
Original line number Diff line number Diff line 
/* 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>

arch/s390/kernel/hiperdispatch.c

+5 −0
Original line number Diff line number Diff line
@@ -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);

}