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hv_balloon: trace post_status

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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: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2018-03-04 22:17:22 -07:00 • committed by Greg Kroah-Hartman
parent bba072d162
commit cf21be919c
3 changed files with 55 additions and 0 deletions
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1
drivers/hv/Makefile
View file

@ -4,6 +4,7 @@ obj-$(CONFIG_HYPERV_UTILS) += hv_utils.o
obj-$(CONFIG_HYPERV_BALLOON) += hv_balloon.o obj-$(CONFIG_HYPERV_BALLOON) += hv_balloon.o
CFLAGS_hv_trace.o = -I$(src) CFLAGS_hv_trace.o = -I$(src)
CFLAGS_hv_balloon.o = -I$(src)
hv_vmbus-y := vmbus_drv.o \ hv_vmbus-y := vmbus_drv.o \
hv.o connection.o channel.o \ hv.o connection.o channel.o \

6
drivers/hv/hv_balloon.c
View file

@ -34,6 +34,9 @@
#include <linux/hyperv.h> #include <linux/hyperv.h>
#define CREATE_TRACE_POINTS
#include "hv_trace_balloon.h"
/* /*
* We begin with definitions supporting the Dynamic Memory protocol * We begin with definitions supporting the Dynamic Memory protocol
* with the host. * 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) + dm->num_pages_added - dm->num_pages_onlined : 0) +
compute_balloon_floor(); 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* If our transaction ID is no longer current, just don't * If our transaction ID is no longer current, just don't
* send the status. This can happen if we were interrupted * send the status. This can happen if we were interrupted

48
drivers/hv/hv_trace_balloon.h Normal file
View file

@ -0,0 +1,48 @@
#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>