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Commit cf21be91 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Greg Kroah-Hartman
Browse files

hv_balloon: trace post_status 



Hyper-V balloon driver makes non-trivial calculations to convert Linux's
representation of free/used memory to what Hyper-V host expects to see. Add
a tracepoint to see what's being sent and where the data comes from.

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent bba072d1

drivers/hv/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ obj-$(CONFIG_HYPERV_UTILS) += hv_utils.o 
obj-$(CONFIG_HYPERV_BALLOON)	+= hv_balloon.o



CFLAGS_hv_trace.o = -I$(src)

CFLAGS_hv_balloon.o = -I$(src)



hv_vmbus-y := vmbus_drv.o \

		 hv.o connection.o channel.o \

drivers/hv/hv_balloon.c

+6 −0
Original line number Diff line number Diff line
@@ -34,6 +34,9 @@ 


#include <linux/hyperv.h>



#define CREATE_TRACE_POINTS

#include "hv_trace_balloon.h"



/*

 * We begin with definitions supporting the Dynamic Memory protocol

 * with the host.
@@ -1159,6 +1162,9 @@ static void post_status(struct hv_dynmem_device *dm) 
		 dm->num_pages_added - dm->num_pages_onlined : 0) +

		compute_balloon_floor();



	trace_balloon_status(status.num_avail, status.num_committed,

			     vm_memory_committed(), dm->num_pages_ballooned,

			     dm->num_pages_added, dm->num_pages_onlined);

	/*

	 * If our transaction ID is no longer current, just don't

	 * send the status. This can happen if we were interrupted

drivers/hv/hv_trace_balloon.h

0 → 100644
+48 −0
Original line number Diff line number Diff line 
#undef TRACE_SYSTEM

#define TRACE_SYSTEM hyperv



#if !defined(_HV_TRACE_BALLOON_H) || defined(TRACE_HEADER_MULTI_READ)

#define _HV_TRACE_BALLOON_H



#include <linux/tracepoint.h>



TRACE_EVENT(balloon_status,

	    TP_PROTO(u64 available, u64 committed,

		     unsigned long vm_memory_committed,

		     unsigned long pages_ballooned,

		     unsigned long pages_added,

		     unsigned long pages_onlined),

	    TP_ARGS(available, committed, vm_memory_committed,

		    pages_ballooned, pages_added, pages_onlined),

	    TP_STRUCT__entry(

		    __field(u64, available)

		    __field(u64, committed)

		    __field(unsigned long, vm_memory_committed)

		    __field(unsigned long, pages_ballooned)

		    __field(unsigned long, pages_added)

		    __field(unsigned long, pages_onlined)

		    ),

	    TP_fast_assign(

		    __entry->available = available;

		    __entry->committed = committed;

		    __entry->vm_memory_committed = vm_memory_committed;

		    __entry->pages_ballooned = pages_ballooned;

		    __entry->pages_added = pages_added;

		    __entry->pages_onlined = pages_onlined;

		    ),

	    TP_printk("available %lld, committed %lld; vm_memory_committed %ld;"

		      " pages_ballooned %ld, pages_added %ld, pages_onlined %ld",

		      __entry->available, __entry->committed,

		      __entry->vm_memory_committed, __entry->pages_ballooned,

		      __entry->pages_added, __entry->pages_onlined

		    )

	);



#undef TRACE_INCLUDE_PATH

#define TRACE_INCLUDE_PATH .

#undef TRACE_INCLUDE_FILE

#define TRACE_INCLUDE_FILE hv_trace_balloon

#endif /* _HV_TRACE_BALLOON_H */



/* This part must be outside protection */

#include <trace/define_trace.h>