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Subject[PATCH v6 3/3] KVM: perf kvm events analysis tool
Date
From: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>

Add 'perf kvm stat' support to analyze kvm vmexit/mmio/ioport smartly.

Usage:
- kvm stat
run a command and gather performance counter statistics, it is the alias of
perf stat

- trace kvm events:
perf kvm stat record, or, if other tracepoints are interesting as well, we
can append the events like this:
perf kvm stat record -e timer:*
If many guests are running, we can track the specified guest by using -p or
--pid

- show the result:
perf kvm stat report

The output example is following:
# pgrep qemu-kvm
27841
27888
27936

total 3 guests are running on the host

Then, track the guest whose pid is 27936:
# ./perf kvm stat record -p 27936
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.177 MB perf.data.guest (~7742 samples) ]

See the vmexit events:
# ./perf kvm stat report --event=vmexit


Analyze events for all VCPUs:

VM-EXIT Samples Samples% Time% Avg time

APIC_ACCESS 237 80.34% 0.01% 20.86us ( +- 8.03% )
HLT 45 15.25% 99.98% 790874.75us ( +- 16.93% )
EXTERNAL_INTERRUPT 11 3.73% 0.00% 47.70us ( +- 17.45% )
EXCEPTION_NMI 1 0.34% 0.00% 5.11us ( +- -nan% )
CR_ACCESS 1 0.34% 0.00% 6.33us ( +- -nan% )

Total Samples:295, Total events handled time:35594844.34us.

See the mmio events:
# ./perf kvm stat report --event=mmio


Analyze events for all VCPUs:

MMIO Access Samples Samples% Time% Avg time

0xfee00380:W 151 82.07% 76.19% 7.72us ( +- 11.96% )
0xfee00300:W 11 5.98% 18.86% 26.23us ( +- 27.33% )
0xfee00300:R 11 5.98% 2.16% 3.00us ( +- 9.17% )
0xfee00310:W 11 5.98% 2.79% 3.88us ( +- 9.15% )

Total Samples:184, Total events handled time:1529.42us.

See the ioport event:
# ./perf kvm stat report --event=ioport


Analyze events for all VCPUs:

IO Port Access Samples Samples% Time% Avg time

0x5658:PIN 3357 55.22% 92.13% 162.31us ( +- 0.87% )
0xc090:POUT 1221 20.09% 2.10% 10.18us ( +- 4.97% )
0x60:PIN 748 12.30% 3.18% 25.17us ( +- 5.01% )
0x64:PIN 748 12.30% 2.57% 20.35us ( +- 11.81% )
0xc050:POUT 5 0.08% 0.01% 8.79us ( +- 12.88% )

Total Samples:6079, Total events handled time:591405.43us.

And, --vcpu is used to track the specified vcpu and --key is used to sort the
result:
# ./perf kvm stat report --event=ioport --vcpu=0 --key=time


Analyze events for VCPU 0:

IO Port Access Samples Samples% Time% Avg time

0x5658:PIN 145 94.77% 99.67% 133.00us ( +- 2.96% )
0xc090:POUT 8 5.23% 0.33% 7.99us ( +- 16.85% )

Total Samples:153, Total events handled time:19348.87us.


[ Dong Hao <haodong@linux.vnet.ibm.com>:
- rebase it on current tip tree
- fix the compiling-error on i386
]
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Dong Hao <haodong@linux.vnet.ibm.com>
---
tools/perf/Documentation/perf-kvm.txt | 30 ++-
tools/perf/MANIFEST | 3 +
tools/perf/builtin-kvm.c | 858 ++++++++++++++++++++++++++++++++-
tools/perf/util/header.c | 55 ++-
tools/perf/util/header.h | 1 +
tools/perf/util/thread.h | 2 +
6 files changed, 943 insertions(+), 6 deletions(-)

diff --git a/tools/perf/Documentation/perf-kvm.txt b/tools/perf/Documentation/perf-kvm.txt
index dd84cb2..d52feef 100644
--- a/tools/perf/Documentation/perf-kvm.txt
+++ b/tools/perf/Documentation/perf-kvm.txt
@@ -12,7 +12,7 @@ SYNOPSIS
[--guestkallsyms=<path> --guestmodules=<path> | --guestvmlinux=<path>]]
{top|record|report|diff|buildid-list}
'perf kvm' [--host] [--guest] [--guestkallsyms=<path> --guestmodules=<path>
- | --guestvmlinux=<path>] {top|record|report|diff|buildid-list}
+ | --guestvmlinux=<path>] {top|record|report|diff|buildid-list|stat}

DESCRIPTION
-----------
@@ -38,6 +38,18 @@ There are a couple of variants of perf kvm:
so that other tools can be used to fetch packages with matching symbol tables
for use by perf report.

+ 'perf kvm stat <command>' to run a command and gather performance counter
+ statistics.
+ Especially, perf 'kvm stat record/report' generates a statistical analysis
+ of KVM events. Currently, vmexit, mmio and ioport events are supported.
+ 'perf kvm stat record <command>' records kvm events and the events between
+ start and end <command>.
+ And this command produces a file which contains tracing results of kvm
+ events.
+
+ 'perf kvm stat report' reports statistical data which includes events
+ handled time, samples, and so on.
+
OPTIONS
-------
-i::
@@ -68,7 +80,21 @@ OPTIONS
--guestvmlinux=<path>::
Guest os kernel vmlinux.

+STAT REPORT OPTIONS
+-------------------
+--vcpu=<value>::
+ analyze events which occures on this vcpu. (default: all vcpus)
+
+--events=<value>::
+ events to be analyzed. Possible values: vmexit, mmio, ioport.
+ (default: vmexit)
+-k::
+--key=<value>::
+ Sorting key. Possible values: sample (default, sort by samples
+ number), time (sort by average time).
+
SEE ALSO
--------
linkperf:perf-top[1], linkperf:perf-record[1], linkperf:perf-report[1],
-linkperf:perf-diff[1], linkperf:perf-buildid-list[1]
+linkperf:perf-diff[1], linkperf:perf-buildid-list[1],
+linkperf:perf-stat[1]
diff --git a/tools/perf/MANIFEST b/tools/perf/MANIFEST
index b4b572e..6896648 100644
--- a/tools/perf/MANIFEST
+++ b/tools/perf/MANIFEST
@@ -15,3 +15,6 @@ arch/*/lib/memset*.S
include/linux/poison.h
include/linux/magic.h
include/linux/hw_breakpoint.h
+arch/x86/include/asm/svm.h
+arch/x86/include/asm/vmx.h
+arch/x86/include/asm/kvm_host.h
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 9fc6e0f..99fc5e1 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -10,8 +10,9 @@

#include "util/parse-options.h"
#include "util/trace-event.h"
-
#include "util/debug.h"
+#include "util/debugfs.h"
+#include "util/tool.h"

#include <sys/prctl.h>

@@ -19,11 +20,860 @@
#include <pthread.h>
#include <math.h>

-static const char *file_name;
+#include "../../arch/x86/include/asm/svm.h"
+#include "../../arch/x86/include/asm/vmx.h"
+#include "../../arch/x86/include/asm/kvm_host.h"
+
+struct event_key {
+ #define INVALID_KEY (~0ULL)
+ u64 key;
+ int info;
+};
+
+struct kvm_events_ops {
+ bool (*is_begin_event)(struct event_format *event, void *data,
+ struct event_key *key);
+ bool (*is_end_event)(struct event_format *event, void *data,
+ struct event_key *key);
+ void (*decode_key)(struct event_key *key, char decode[20]);
+ const char *name;
+};
+
+static void exit_event_get_key(struct event_format *event, void *data,
+ struct event_key *key)
+{
+ key->info = 0;
+ key->key = raw_field_value(event, "exit_reason", data);
+}
+
+static bool kvm_exit_event(struct event_format *event)
+{
+ return !strcmp(event->name, "kvm_exit");
+}
+
+static bool exit_event_begin(struct event_format *event, void *data,
+ struct event_key *key)
+{
+ if (kvm_exit_event(event)) {
+ exit_event_get_key(event, data, key);
+ return true;
+ }
+
+ return false;
+}
+
+static bool kvm_entry_event(struct event_format *event)
+{
+ return !strcmp(event->name, "kvm_entry");
+}
+
+static bool exit_event_end(struct event_format *event, void *data __unused,
+ struct event_key *key __unused)
+{
+ return kvm_entry_event(event);
+}
+
+struct exit_reasons_table {
+ unsigned long exit_code;
+ const char *reason;
+};
+
+struct exit_reasons_table vmx_exit_reasons[] = {
+ VMX_EXIT_REASONS
+};
+
+struct exit_reasons_table svm_exit_reasons[] = {
+ SVM_EXIT_REASONS
+};
+
+static int cpu_isa;
+
+static const char *get_exit_reason(u64 exit_code)
+{
+ int table_size = ARRAY_SIZE(svm_exit_reasons);
+ struct exit_reasons_table *table = svm_exit_reasons;
+
+ if (cpu_isa == 1) {
+ table = vmx_exit_reasons;
+ table_size = ARRAY_SIZE(vmx_exit_reasons);
+ }
+
+ while (table_size--) {
+ if (table->exit_code == exit_code)
+ return table->reason;
+ table++;
+ }
+
+ die("unknown kvm exit code:%llx on %s\n",
+ (unsigned long long)exit_code, cpu_isa ? "VMX" : "SVM");
+}
+
+static void exit_event_decode_key(struct event_key *key, char decode[20])
+{
+ const char *exit_reason = get_exit_reason(key->key);
+
+ snprintf(decode, 20, "%s", exit_reason);
+}
+
+static struct kvm_events_ops exit_events = {
+ .is_begin_event = exit_event_begin,
+ .is_end_event = exit_event_end,
+ .decode_key = exit_event_decode_key,
+ .name = "VM-EXIT"
+};
+
+/*
+ * For the old kernel, we treat:
+ * the time of MMIO write: kvm_mmio(KVM_TRACE_MMIO_WRITE...) -> kvm_entry
+ * the time of MMIO read: kvm_exit -> kvm_mmio(KVM_TRACE_MMIO_READ...).
+ *
+ * For the new kernel, we use kvm_mmio_begin and kvm_mmio_done to make
+ * things better.
+ */
+static void mmio_event_get_key(struct event_format *event, void *data,
+ struct event_key *key)
+{
+ key->key = raw_field_value(event, "gpa", data);
+ key->info = raw_field_value(event, "type", data);
+}
+
+#define KVM_TRACE_MMIO_READ_UNSATISFIED 0
+#define KVM_TRACE_MMIO_READ 1
+#define KVM_TRACE_MMIO_WRITE 2
+
+static bool kvm_mmio_done_event(struct event_format *event)
+{
+ return !strcmp(event->name, "kvm_mmio_done");
+}
+
+static bool mmio_event_begin(struct event_format *event, void *data,
+ struct event_key *key)
+{
+ /* MMIO read begin in old kernel. */
+ if (kvm_exit_event(event))
+ return true;
+
+ /* MMIO write begin in old kernel. */
+ if (!strcmp(event->name, "kvm_mmio") &&
+ raw_field_value(event, "type", data) == KVM_TRACE_MMIO_WRITE) {
+ mmio_event_get_key(event, data, key);
+ return true;
+ }
+
+ /* MMIO read/write begin in new kernel. */
+ if (!strcmp(event->name, "kvm_mmio_begin")) {
+ mmio_event_get_key(event, data, key);
+ return true;
+ }
+
+ return false;
+}
+
+static bool mmio_event_end(struct event_format *event, void *data,
+ struct event_key *key)
+{
+ /* MMIO write end in old kernel. */
+ if (kvm_entry_event(event))
+ return true;
+
+ /* MMIO read end in the old kernel.*/
+ if (!strcmp(event->name, "kvm_mmio") &&
+ raw_field_value(event, "type", data) == KVM_TRACE_MMIO_READ) {
+ mmio_event_get_key(event, data, key);
+ return true;
+ }
+
+ /* MMIO read/write end event in the new kernel.*/
+ return kvm_mmio_done_event(event);
+}
+
+static void mmio_event_decode_key(struct event_key *key, char decode[20])
+{
+ snprintf(decode, 20, "%#llx:%s", (unsigned long long)key->key,
+ key->info == KVM_TRACE_MMIO_WRITE ? "W" : "R");
+}
+
+static struct kvm_events_ops mmio_events = {
+ .is_begin_event = mmio_event_begin,
+ .is_end_event = mmio_event_end,
+ .decode_key = mmio_event_decode_key,
+ .name = "MMIO Access"
+};
+
+/*
+ * For the old kernel, the time of emulation pio access is from kvm_pio to
+ * kvm_entry. In the new kernel, the end time is indicated by kvm_mmio_done.
+ */
+static void ioport_event_get_key(struct event_format *event, void *data,
+ struct event_key *key)
+{
+ key->key = raw_field_value(event, "port", data);
+ key->info = raw_field_value(event, "rw", data);
+}
+
+static bool ioport_event_begin(struct event_format *event, void *data,
+ struct event_key *key)
+{
+ if (!strcmp(event->name, "kvm_pio")) {
+ ioport_event_get_key(event, data, key);
+ return true;
+ }
+
+ return false;
+}
+
+static bool ioport_event_end(struct event_format *event, void *data __unused,
+ struct event_key *key __unused)
+{
+ if (kvm_entry_event(event))
+ return true;
+
+ return kvm_mmio_done_event(event);
+}
+
+static void ioport_event_decode_key(struct event_key *key, char decode[20])
+{
+ snprintf(decode, 20, "%#llx:%s", (unsigned long long)key->key,
+ key->info ? "POUT" : "PIN");
+}
+
+static struct kvm_events_ops ioport_events = {
+ .is_begin_event = ioport_event_begin,
+ .is_end_event = ioport_event_end,
+ .decode_key = ioport_event_decode_key,
+ .name = "IO Port Access"
+};
+
+static const char *report_event = "vmexit";
+struct kvm_events_ops *events_ops;
+
+static void register_kvm_events_ops(void)
+{
+ if (!strcmp(report_event, "vmexit"))
+ events_ops = &exit_events;
+ else if (!strcmp(report_event, "mmio"))
+ events_ops = &mmio_events;
+ else if (!strcmp(report_event, "ioport"))
+ events_ops = &ioport_events;
+ else
+ die("Unknown report event:%s\n", report_event);
+}
+
+struct event_stats {
+ u64 count;
+ u64 time;
+
+ /* used to calculate stddev. */
+ double mean;
+ double M2;
+};
+
+struct kvm_event {
+ struct list_head hash_entry;
+ struct rb_node rb;
+
+ struct event_key key;
+
+ struct event_stats total;
+
+ #define DEFAULT_VCPU_NUM 8
+ int max_vcpu;
+ struct event_stats *vcpu;
+};
+
+struct vcpu_event_record {
+ int vcpu_id;
+ u64 start_time;
+ struct kvm_event *last_event;
+};
+
+#define EVENTS_BITS 12
+#define EVENTS_CACHE_SIZE (1UL << EVENTS_BITS)
+
+static u64 total_time;
+static u64 total_count;
+static struct list_head kvm_events_cache[EVENTS_CACHE_SIZE];
+
+static void init_kvm_event_record(void)
+{
+ int i;
+
+ for (i = 0; i < (int)EVENTS_CACHE_SIZE; i++)
+ INIT_LIST_HEAD(&kvm_events_cache[i]);
+}
+
+static int kvm_events_hash_fn(u64 key)
+{
+ return key & (EVENTS_CACHE_SIZE - 1);
+}
+
+static void kvm_event_expand(struct kvm_event *event, int vcpu_id)
+{
+ int old_max_vcpu = event->max_vcpu;
+
+ if (vcpu_id < event->max_vcpu)
+ return;
+
+ while (event->max_vcpu <= vcpu_id)
+ event->max_vcpu += DEFAULT_VCPU_NUM;
+
+ event->vcpu = realloc(event->vcpu,
+ event->max_vcpu * sizeof(*event->vcpu));
+ if (!event->vcpu)
+ die("Not enough memory\n");
+
+ memset(event->vcpu + old_max_vcpu, 0,
+ (event->max_vcpu - old_max_vcpu) * sizeof(*event->vcpu));
+}
+
+static struct kvm_event *kvm_alloc_init_event(struct event_key *key)
+{
+ struct kvm_event *event;
+
+ event = zalloc(sizeof(*event));
+ if (!event)
+ die("Not enough memory\n");
+
+ event->key = *key;
+ return event;
+}
+
+static struct kvm_event *find_create_kvm_event(struct event_key *key)
+{
+ struct kvm_event *event;
+ struct list_head *head;
+
+ BUG_ON(key->key == INVALID_KEY);
+
+ head = &kvm_events_cache[kvm_events_hash_fn(key->key)];
+ list_for_each_entry(event, head, hash_entry)
+ if (event->key.key == key->key && event->key.info == key->info)
+ return event;
+
+ event = kvm_alloc_init_event(key);
+ list_add(&event->hash_entry, head);
+ return event;
+}
+
+static void handle_begin_event(struct vcpu_event_record *vcpu_record,
+ struct event_key *key, u64 timestamp)
+{
+ struct kvm_event *event = NULL;
+
+ if (key->key != INVALID_KEY)
+ event = find_create_kvm_event(key);
+
+ vcpu_record->last_event = event;
+ vcpu_record->start_time = timestamp;
+}
+
+static void update_event_stats(struct event_stats *stats, u64 time_diff)
+{
+ double delta;
+
+ stats->count++;
+ stats->time += time_diff;
+
+ delta = time_diff - stats->mean;
+ stats->mean += delta / stats->count;
+ stats->M2 += delta*(time_diff - stats->mean);
+}
+
+static double event_stats_stddev(int vcpu_id, struct kvm_event *event)
+{
+ struct event_stats *stats = &event->total;
+ double variance, variance_mean, stddev;
+
+ if (vcpu_id != -1)
+ stats = &event->vcpu[vcpu_id];
+
+ BUG_ON(!stats->count);
+
+ variance = stats->M2 / (stats->count - 1);
+ variance_mean = variance / stats->count;
+ stddev = sqrt(variance_mean);
+
+ return stddev * 100 / stats->mean;
+}
+
+static void update_kvm_event(struct kvm_event *event, int vcpu_id,
+ u64 time_diff)
+{
+ update_event_stats(&event->total, time_diff);
+ kvm_event_expand(event, vcpu_id);
+ update_event_stats(&event->vcpu[vcpu_id], time_diff);
+}
+
+static void handle_end_event(struct vcpu_event_record *vcpu_record,
+ struct event_key *key, u64 timestamp)
+{
+ struct kvm_event *event;
+ u64 time_begin, time_diff;
+
+ event = vcpu_record->last_event;
+ time_begin = vcpu_record->start_time;
+
+ /* The begin event is not caught. */
+ if (!time_begin)
+ return;
+
+ /*
+ * In some case, the 'begin event' only records the start timestamp,
+ * the actual event is recognized in the 'end event' (e.g. mmio-event
+ * in the old kernel).
+ */
+
+ /* Both begin and end events did not get the key. */
+ if (!event && key->key == INVALID_KEY)
+ return;
+
+ if (!event)
+ event = find_create_kvm_event(key);
+
+ vcpu_record->last_event = NULL;
+ vcpu_record->start_time = 0;
+
+ BUG_ON(timestamp < time_begin);
+
+ time_diff = timestamp - time_begin;
+ update_kvm_event(event, vcpu_record->vcpu_id, time_diff);
+}
+
+static struct vcpu_event_record
+*per_vcpu_record(struct thread *thread, struct event_format *event, void *data)
+{
+ /* Only kvm_entry records vcpu id. */
+ if (!thread->private && kvm_entry_event(event)) {
+ struct vcpu_event_record *vcpu_record;
+
+ vcpu_record = zalloc(sizeof(struct vcpu_event_record));
+ if (!vcpu_record)
+ die("Not enough memory\n");
+
+ vcpu_record->vcpu_id = raw_field_value(event, "vcpu_id", data);
+ thread->private = vcpu_record;
+ }
+
+ return (struct vcpu_event_record *)thread->private;
+}
+
+static void handle_kvm_event(struct thread *thread, struct event_format *event,
+ void *data, u64 timestamp)
+{
+ struct vcpu_event_record *vcpu_record;
+ struct event_key key = {.key = INVALID_KEY};
+
+ vcpu_record = per_vcpu_record(thread, event, data);
+ if (!vcpu_record)
+ return;
+
+ if (events_ops->is_begin_event(event, data, &key))
+ return handle_begin_event(vcpu_record, &key, timestamp);
+
+ if (events_ops->is_end_event(event, data, &key))
+ return handle_end_event(vcpu_record, &key, timestamp);
+}
+
+typedef int (*key_cmp_fun)(struct kvm_event*, struct kvm_event*, int);
+struct kvm_event_key {
+ const char *name;
+ key_cmp_fun key;
+};
+
+static int trace_vcpu = -1;
+#define GET_EVENT_KEY(member) \
+static u64 get_event_ ##member(struct kvm_event *event, int vcpu) \
+{ \
+ if (vcpu == -1) \
+ return event->total.member; \
+ \
+ if (vcpu >= event->max_vcpu) \
+ return 0; \
+ \
+ return event->vcpu[vcpu].member; \
+}
+
+#define COMPARE_EVENT_KEY(member) \
+GET_EVENT_KEY(member) \
+static int compare_kvm_event_ ## member(struct kvm_event *one, \
+ struct kvm_event *two, int vcpu)\
+{ \
+ return get_event_ ##member(one, vcpu) > \
+ get_event_ ##member(two, vcpu); \
+}
+
+GET_EVENT_KEY(time);
+COMPARE_EVENT_KEY(count);
+COMPARE_EVENT_KEY(mean);
+
+#define DEF_SORT_NAME_KEY(name, compare_key) \
+ { #name, compare_kvm_event_ ## compare_key }
+
+static struct kvm_event_key keys[] = {
+ DEF_SORT_NAME_KEY(sample, count),
+ DEF_SORT_NAME_KEY(time, mean),
+ { NULL, NULL }
+};
+
+static const char *sort_key = "sample";
+static key_cmp_fun compare;
+
+static void select_key(void)
+{
+ int i;
+
+ for (i = 0; keys[i].name; i++) {
+ if (!strcmp(keys[i].name, sort_key)) {
+ compare = keys[i].key;
+ return;
+ }
+ }
+
+ die("Unknown compare key:%s\n", sort_key);
+}
+
+static struct rb_root result;
+static void insert_to_result(struct kvm_event *event, key_cmp_fun bigger,
+ int vcpu)
+{
+ struct rb_node **rb = &result.rb_node;
+ struct rb_node *parent = NULL;
+ struct kvm_event *p;
+
+ while (*rb) {
+ p = container_of(*rb, struct kvm_event, rb);
+ parent = *rb;
+
+ if (bigger(event, p, vcpu))
+ rb = &(*rb)->rb_left;
+ else
+ rb = &(*rb)->rb_right;
+ }
+
+ rb_link_node(&event->rb, parent, rb);
+ rb_insert_color(&event->rb, &result);
+}
+
+static void update_total_count(struct kvm_event *event, int vcpu)
+{
+ total_count += get_event_count(event, vcpu);
+ total_time += get_event_time(event, vcpu);
+}
+
+static bool event_is_valid(struct kvm_event *event, int vcpu)
+{
+ return !!get_event_count(event, vcpu);
+}
+
+static void sort_result(int vcpu)
+{
+ unsigned int i;
+ struct kvm_event *event;
+
+ for (i = 0; i < EVENTS_CACHE_SIZE; i++)
+ list_for_each_entry(event, &kvm_events_cache[i], hash_entry)
+ if (event_is_valid(event, vcpu)) {
+ update_total_count(event, vcpu);
+ insert_to_result(event, compare, vcpu);
+ }
+}
+
+/* returns left most element of result, and erase it */
+static struct kvm_event *pop_from_result(void)
+{
+ struct rb_node *node = result.rb_node;
+
+ if (!node)
+ return NULL;
+
+ while (node->rb_left)
+ node = node->rb_left;
+
+ rb_erase(node, &result);
+ return container_of(node, struct kvm_event, rb);
+}
+
+static void print_vcpu_info(int vcpu)
+{
+ pr_info("Analyze events for ");
+
+ if (vcpu == -1)
+ pr_info("all VCPUs:\n\n");
+ else
+ pr_info("VCPU %d:\n\n", vcpu);
+}
+
+static void print_result(int vcpu)
+{
+ char decode[20];
+ struct kvm_event *event;
+
+ pr_info("\n\n");
+ print_vcpu_info(vcpu);
+ pr_info("%20s ", events_ops->name);
+ pr_info("%10s ", "Samples");
+ pr_info("%9s ", "Samples%");
+
+ pr_info("%9s ", "Time%");
+ pr_info("%16s ", "Avg time");
+ pr_info("\n\n");
+
+ while ((event = pop_from_result())) {
+ u64 ecount, etime;
+
+ ecount = get_event_count(event, vcpu);
+ etime = get_event_time(event, vcpu);
+
+ events_ops->decode_key(&event->key, decode);
+ pr_info("%20s ", decode);
+ pr_info("%10llx ", (unsigned long long)ecount);
+ pr_info("%8.2f%% ", (double)ecount / total_count * 100);
+ pr_info("%8.2f%% ", (double)etime / total_time * 100);
+ pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount/1e3,
+ event_stats_stddev(trace_vcpu, event));
+ pr_info("\n");
+ }
+
+ pr_info("\nTotal Samples:%llx, Total events handled time:%.2fus.\n\n",
+ (unsigned long long)total_count, total_time / 1e3);
+}
+
+static struct perf_session *kvm_session;
+
+static void process_raw_event(struct thread *thread, void *data, u64 timestamp)
+{
+ struct event_format *event;
+ int type;
+
+ type = trace_parse_common_type(kvm_session->pevent, data);
+ event = pevent_find_event(kvm_session->pevent, type);
+
+ return handle_kvm_event(thread, event, data, timestamp);
+}
+
+static int process_sample_event(struct perf_tool *tool __used,
+ union perf_event *event,
+ struct perf_sample *sample,
+ struct perf_evsel *evsel __used,
+ struct machine *machine)
+{
+ struct thread *thread = machine__findnew_thread(machine, sample->tid);
+
+ if (thread == NULL) {
+ pr_debug("problem processing %d event, skipping it.\n",
+ event->header.type);
+ return -1;
+ }
+
+ process_raw_event(thread, sample->raw_data, sample->time);
+
+ return 0;
+}
+
+static struct perf_tool eops = {
+ .sample = process_sample_event,
+ .comm = perf_event__process_comm,
+ .ordered_samples = true,
+};
+
+static int get_cpu_isa(struct perf_session *session)
+{
+ char *cpuid;
+ int isa;
+
+ cpuid = perf_header__read_feature(session, HEADER_CPUID);
+
+ if (!cpuid)
+ die("read HEADER_CPUID failed.\n");
+
+ if (strstr(cpuid, "Intel"))
+ isa = 1;
+ else if (strstr(cpuid, "AMD"))
+ isa = 0;
+ else
+ die("CPU %s is not supported.\n", cpuid);
+
+ free(cpuid);
+ return isa;
+}
+
+static const char *file_name;
+
+static int read_events(void)
+{
+ kvm_session = perf_session__new(file_name, O_RDONLY, 0, false, &eops);
+ if (!kvm_session)
+ die("Initializing perf session failed\n");
+
+ if (!perf_session__has_traces(kvm_session, "kvm record"))
+ return -1;
+
+ /*
+ * Do not use 'isa' recorded in kvm_exit tracepoint since it is not
+ * traced in the old kernel.
+ */
+ cpu_isa = get_cpu_isa(kvm_session);
+
+ return perf_session__process_events(kvm_session, &eops);
+}
+
+static void verify_vcpu(int vcpu)
+{
+ if (vcpu != -1 && vcpu < 0)
+ die("Invalid vcpu:%d.\n", vcpu);
+}
+
+static int kvm_events_report_vcpu(int vcpu)
+{
+ init_kvm_event_record();
+ verify_vcpu(vcpu);
+ select_key();
+ register_kvm_events_ops();
+ setup_pager();
+
+ read_events();
+
+ sort_result(vcpu);
+ print_result(vcpu);
+ return 0;
+}
+
+static const char * const record_args[] = {
+ "record",
+ "-R",
+ "-f",
+ "-m", "1024",
+ "-c", "1",
+ "-e", "kvm:kvm_entry",
+ "-e", "kvm:kvm_exit",
+ "-e", "kvm:kvm_mmio",
+ "-e", "kvm:kvm_pio",
+};
+
+static const char * const new_event[] = {
+ "kvm_mmio_begin",
+ "kvm_mmio_done"
+};
+
+static bool kvm_events_exist(const char *event)
+{
+ char evt_path[MAXPATHLEN];
+ int fd;
+
+ snprintf(evt_path, MAXPATHLEN, "%s/kvm/%s/id", tracing_events_path,
+ event);
+
+ fd = open(evt_path, O_RDONLY);
+
+ if (fd < 0)
+ return false;
+
+ close(fd);
+
+ return true;
+}
+
+static bool kvm_record_specified_guest(int argc, const char **argv)
+{
+ int i;
+
+ for (i = 0; i < argc; i++)
+ if (!strcmp(argv[i], "-p") || !strcmp(argv[i], "--pid"))
+ return true;
+
+ return false;
+}
+
+static int kvm_events_record(int argc, const char **argv)
+{
+ unsigned int rec_argc, i, j;
+ const char **rec_argv;
+
+ rec_argc = ARRAY_SIZE(record_args) + argc + 2;
+ rec_argc += ARRAY_SIZE(new_event) * 2;
+ rec_argv = calloc(rec_argc + 1, sizeof(char *));
+
+ if (rec_argv == NULL)
+ return -ENOMEM;
+
+ for (i = 0; i < ARRAY_SIZE(record_args); i++)
+ rec_argv[i] = strdup(record_args[i]);
+
+ /*
+ * Append "-a" only if "-p"/"--pid" is not specified since they
+ * are mutually exclusive.
+ */
+ if (!kvm_record_specified_guest(argc, argv))
+ rec_argv[i++] = strdup("-a");
+
+ rec_argv[i++] = strdup("-o");
+ rec_argv[i++] = strdup(file_name);
+
+ for (j = 0; j < ARRAY_SIZE(new_event); j++)
+ if (kvm_events_exist(new_event[j])) {
+ char event[256];
+
+ sprintf(event, "kvm:%s", new_event[j]);
+
+ rec_argv[i++] = strdup("-e");
+ rec_argv[i++] = strdup(event);
+ }
+
+ for (j = 1; j < (unsigned int)argc; j++, i++)
+ rec_argv[i] = argv[j];
+
+ return cmd_record(i, rec_argv, NULL);
+}
+
+static const char * const kvm_events_report_usage[] = {
+ "perf kvm stat report [<options>]",
+ NULL
+};
+
+static const struct option kvm_events_report_options[] = {
+ OPT_STRING(0, "event", &report_event, "report event",
+ "event for reporting: vmexit, mmio, ioport"),
+ OPT_INTEGER(0, "vcpu", &trace_vcpu,
+ "vcpu id to report"),
+ OPT_STRING('k', "key", &sort_key, "sort-key",
+ "key for sorting: sample(sort by samples number)"
+ " time (sort by avg time)"),
+ OPT_END()
+};
+
+static int kvm_events_report(int argc, const char **argv)
+{
+ symbol__init();
+
+ if (argc) {
+ argc = parse_options(argc, argv,
+ kvm_events_report_options,
+ kvm_events_report_usage, 0);
+ if (argc)
+ usage_with_options(kvm_events_report_usage,
+ kvm_events_report_options);
+ }
+
+ return kvm_events_report_vcpu(trace_vcpu);
+}
+
+static int kvm_cmd_stat(int argc, const char **argv)
+{
+ if (argc > 1) {
+ if (!strncmp(argv[1], "rec", 3))
+ return kvm_events_record(argc - 1, argv + 1);
+
+ if (!strncmp(argv[1], "rep", 3))
+ return kvm_events_report(argc - 1 , argv + 1);
+ }
+
+ return cmd_stat(argc, argv, NULL);
+}
+
static char name_buffer[256];

static const char * const kvm_usage[] = {
- "perf kvm [<options>] {top|record|report|diff|buildid-list}",
+ "perf kvm [<options>] {top|record|report|diff|buildid-list|stat}",
NULL
};

@@ -135,6 +985,8 @@ int cmd_kvm(int argc, const char **argv, const char *prefix __used)
return cmd_top(argc, argv, NULL);
else if (!strncmp(argv[0], "buildid-list", 12))
return __cmd_buildid_list(argc, argv);
+ else if (!strncmp(argv[0], "stat", 4))
+ return kvm_cmd_stat(argc, argv);
else
usage_with_options(kvm_usage, kvm_options);

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 3a6d204..b4bef64 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1495,9 +1495,15 @@ static int process_build_id(struct perf_file_section *section,
return 0;
}

+static char *read_cpuid(struct perf_header *ph, int fd)
+{
+ return do_read_string(fd, ph);
+}
+
struct feature_ops {
int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
void (*print)(struct perf_header *h, int fd, FILE *fp);
+ char *(*read)(struct perf_header *h, int fd);
int (*process)(struct perf_file_section *section,
struct perf_header *h, int feat, int fd, void *data);
const char *name;
@@ -1512,6 +1518,9 @@ struct feature_ops {
#define FEAT_OPF(n, func) \
[n] = { .name = #n, .write = write_##func, .print = print_##func, \
.full_only = true }
+#define FEAT_OPA_R(n, func) \
+ [n] = { .name = #n, .write = write_##func, .print = print_##func, \
+ .read = read_##func }

/* feature_ops not implemented: */
#define print_tracing_data NULL
@@ -1526,7 +1535,7 @@ static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
FEAT_OPA(HEADER_ARCH, arch),
FEAT_OPA(HEADER_NRCPUS, nrcpus),
FEAT_OPA(HEADER_CPUDESC, cpudesc),
- FEAT_OPA(HEADER_CPUID, cpuid),
+ FEAT_OPA_R(HEADER_CPUID, cpuid),
FEAT_OPA(HEADER_TOTAL_MEM, total_mem),
FEAT_OPA(HEADER_EVENT_DESC, event_desc),
FEAT_OPA(HEADER_CMDLINE, cmdline),
@@ -1580,6 +1589,50 @@ int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
return 0;
}

+struct header_read_data {
+ int feat;
+ char *result;
+};
+
+static int perf_file_section__read_feature(struct perf_file_section *section,
+ struct perf_header *ph,
+ int feat, int fd, void *data)
+{
+ struct header_read_data *hd = data;
+
+ if (feat != hd->feat)
+ return 0;
+
+ if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
+ pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
+ "%d, continuing...\n", section->offset, feat);
+ return 0;
+ }
+
+ if (feat >= HEADER_LAST_FEATURE) {
+ pr_warning("unknown feature %d\n", feat);
+ return 0;
+ }
+
+ hd->result = feat_ops[feat].read(ph, fd);
+ return 0;
+}
+
+char *perf_header__read_feature(struct perf_session *session, int feat)
+{
+ struct perf_header *header = &session->header;
+ struct header_read_data hd;
+ int fd = session->fd;
+
+ hd.feat = feat;
+ hd.result = NULL;
+
+
+ perf_header__process_sections(header, fd, &hd,
+ perf_file_section__read_feature);
+ return hd.result;
+}
+
static int do_write_feat(int fd, struct perf_header *h, int type,
struct perf_file_section **p,
struct perf_evlist *evlist)
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 2d42b3e..a8830fa 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -93,6 +93,7 @@ int perf_header__process_sections(struct perf_header *header, int fd,
int feat, int fd, void *data));

int perf_header__fprintf_info(struct perf_session *s, FILE *fp, bool full);
+char *perf_header__read_feature(struct perf_session *session, int feat);

int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
const char *name, bool is_kallsyms);
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index 70c2c13..c48ebf3 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -16,6 +16,8 @@ struct thread {
bool comm_set;
char *comm;
int comm_len;
+
+ void *private;
};

struct machine;
--
1.7.2.5


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