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Date: Fri, 24 Aug 2012 11:53:38 -0600
From: David Ahern <dsahern@...il.com>
To: Dong Hao <haodong@...ux.vnet.ibm.com>
CC: avi@...hat.com, acme@...radead.org, mtosatti@...hat.com,
mingo@...e.hu, xiaoguangrong@...ux.vnet.ibm.com,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v7 3/3] KVM: perf: kvm events analysis tool
This one does not apply to Arnaldo's current perf/core branch. Please
rebase.
David
On 8/23/12 7:15 PM, Dong Hao wrote:
> From: Xiao Guangrong <xiaoguangrong@...ux.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
> 26071
> 32253
> 32564
>
> total 3 guests are running on the host
>
> Then, track the guest whose pid is 26071:
> # ./perf kvm stat record -p 26071
> ^C[ perf record: Woken up 9 times to write data ]
> [ perf record: Captured and wrote 24.903 MB perf.data.guest (~1088034 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 65381 66.58% 5.95% 37.72us ( +- 6.54% )
> EXTERNAL_INTERRUPT 16031 16.32% 3.06% 79.11us ( +- 7.34% )
> CPUID 5360 5.46% 0.06% 4.50us ( +- 35.07% )
> HLT 4496 4.58% 90.75% 8360.34us ( +- 5.22% )
> EPT_VIOLATION 2667 2.72% 0.04% 5.49us ( +- 5.05% )
> PENDING_INTERRUPT 2242 2.28% 0.03% 5.25us ( +- 2.96% )
> EXCEPTION_NMI 1332 1.36% 0.02% 6.53us ( +- 6.51% )
> IO_INSTRUCTION 383 0.39% 0.09% 93.39us ( +- 40.92% )
> CR_ACCESS 310 0.32% 0.00% 6.10us ( +- 3.95% )
>
> Total Samples:98202, Total events handled time:41419293.63us.
>
> See the mmio events:
> # ./perf kvm stat report --event=mmio
>
> Analyze events for all VCPUs:
>
> MMIO Access Samples Samples% Time% Avg time
>
> 0xfee00380:W 58686 90.21% 15.67% 4.95us ( +- 2.96% )
> 0xfee00300:R 2124 3.26% 1.48% 12.93us ( +- 14.75% )
> 0xfee00310:W 2124 3.26% 0.34% 3.00us ( +- 1.33% )
> 0xfee00300:W 2123 3.26% 82.50% 720.68us ( +- 10.24% )
>
> Total Samples:65057, Total events handled time:1854470.45us.
>
> See the ioport event:
> # ./perf kvm stat report --event=ioport
>
> Analyze events for all VCPUs:
>
> IO Port Access Samples Samples% Time% Avg time
>
> 0xc090:POUT 383 100.00% 100.00% 89.00us ( +- 42.94% )
>
> Total Samples:383, Total events handled time:34085.56us.
>
> And, --vcpu is used to track the specified vcpu and --key is used to sort the
> result:
> # ./perf kvm stat report --event=vmexit --vcpu=0 --key=time
>
> Analyze events for VCPU 0:
>
> VM-EXIT Samples Samples% Time% Avg time
>
> HLT 551 5.05% 94.81% 9501.72us ( +- 12.52% )
> EXTERNAL_INTERRUPT 1390 12.74% 2.39% 94.80us ( +- 20.92% )
> APIC_ACCESS 6186 56.68% 2.62% 23.41us ( +- 23.62% )
> IO_INSTRUCTION 17 0.16% 0.01% 20.39us ( +- 22.33% )
> EXCEPTION_NMI 94 0.86% 0.01% 6.07us ( +- 7.13% )
> PENDING_INTERRUPT 199 1.82% 0.02% 5.48us ( +- 4.36% )
> CR_ACCESS 52 0.48% 0.00% 4.89us ( +- 4.09% )
> EPT_VIOLATION 2057 18.85% 0.12% 3.15us ( +- 1.33% )
> CPUID 368 3.37% 0.02% 2.82us ( +- 2.79% )
>
> Total Samples:10914, Total events handled time:5521782.02us.
>
> [ Dong Hao <haodong@...ux.vnet.ibm.com>:
> - rebase it on current acme's tree
> - fix the compiling-error on i386
> ]
>
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
> Signed-off-by: Dong Hao <haodong@...ux.vnet.ibm.com>
> ---
> tools/perf/Documentation/perf-kvm.txt | 30 +-
> tools/perf/MANIFEST | 3 +
> tools/perf/builtin-kvm.c | 889 ++++++++++++++++++++++++++++++++-
> tools/perf/util/header.c | 54 ++-
> tools/perf/util/header.h | 1 +
> tools/perf/util/thread.h | 2 +
> 6 files changed, 973 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..5396444 100644
> --- a/tools/perf/builtin-kvm.c
> +++ b/tools/perf/builtin-kvm.c
> @@ -1,6 +1,7 @@
> #include "builtin.h"
> #include "perf.h"
>
> +#include "util/evsel.h"
> #include "util/util.h"
> #include "util/cache.h"
> #include "util/symbol.h"
> @@ -10,8 +11,9 @@
>
> #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 +21,890 @@
> #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++;
> + }
> +
> + pr_err("unknown kvm exit code:%lld on %s\n",
> + (unsigned long long)exit_code, cpu_isa ? "VMX" : "SVM");
> + return "UNKNOWN";
> +}
> +
> +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_io_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_io_done_event(struct event_format *event)
> +{
> + return !strcmp(event->name, "kvm_io_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_io_done_event(event);
> +}
> +
> +static void mmio_event_decode_key(struct event_key *key, char decode[20])
> +{
> + snprintf(decode, 20, "%#lx:%s", (unsigned 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_io_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_io_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 bool register_kvm_events_ops(void)
> +{
> + bool ret = true;
> +
> + 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 {
> + pr_err("Unknown report event:%s\n", report_event);
> + ret = false;
> + }
> +
> + return ret;
> +}
> +
> +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 bool kvm_event_expand(struct kvm_event *event, int vcpu_id)
> +{
> + int old_max_vcpu = event->max_vcpu;
> +
> + if (vcpu_id < event->max_vcpu)
> + return true;
> +
> + 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) {
> + pr_err("Not enough memory\n");
> + return false;
> + }
> +
> + memset(event->vcpu + old_max_vcpu, 0,
> + (event->max_vcpu - old_max_vcpu) * sizeof(*event->vcpu));
> + return true;
> +}
> +
> +static struct kvm_event *kvm_alloc_init_event(struct event_key *key)
> +{
> + struct kvm_event *event;
> +
> + event = zalloc(sizeof(*event));
> + if (!event) {
> + pr_err("Not enough memory\n");
> + return NULL;
> + }
> +
> + 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);
> + if (!event)
> + return NULL;
> +
> + 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);
> +
> + if (!kvm_event_expand(event, vcpu_id))
> + return;
> +
> + 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);
> +
> + if (!event)
> + return;
> +
> + 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->priv && kvm_entry_event(event)) {
> + struct vcpu_event_record *vcpu_record;
> +
> + vcpu_record = zalloc(sizeof(struct vcpu_event_record));
> + if (!vcpu_record) {
> + pr_err("Not enough memory\n");
> + return NULL;
> + }
> +
> + vcpu_record->vcpu_id = raw_field_value(event, "vcpu_id", data);
> + thread->priv = vcpu_record;
> + }
> +
> + return (struct vcpu_event_record *)thread->priv;
> +}
> +
> +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 bool select_key(void)
> +{
> + int i;
> +
> + for (i = 0; keys[i].name; i++) {
> + if (!strcmp(keys[i].name, sort_key)) {
> + compare = keys[i].key;
> + return true;
> + }
> + }
> +
> + pr_err("Unknown compare key:%s\n", sort_key);
> + return false;
> +}
> +
> +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("%10llu ", (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:%lld, Total events handled time:%.2fus.\n\n",
> + (unsigned long long)total_count, total_time / 1e3);
> +}
> +
> +static int process_sample_event(struct perf_tool *tool __used,
> + union perf_event *event,
> + struct perf_sample *sample,
> + struct perf_evsel *evsel,
> + 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;
> + }
> +
> + handle_kvm_event(thread, evsel->tp_format, 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) {
> + pr_err("read HEADER_CPUID failed.\n");
> + return -ENOTSUP;
> + }
> +
> + if (strstr(cpuid, "Intel"))
> + isa = 1;
> + else if (strstr(cpuid, "AMD"))
> + isa = 0;
> + else {
> + pr_err("CPU %s is not supported.\n", cpuid);
> + isa = -ENOTSUP;
> + }
> +
> + free(cpuid);
> + return isa;
> +}
> +
> +static const char *file_name;
> +
> +static int read_events(void)
> +{
> + struct perf_session *kvm_session;
> + int ret;
> +
> + kvm_session = perf_session__new(file_name, O_RDONLY, 0, false, &eops);
> + if (!kvm_session) {
> + pr_err("Initializing perf session failed\n");
> + return -EINVAL;
> + }
> +
> + if (!perf_session__has_traces(kvm_session, "kvm record"))
> + return -EINVAL;
> +
> + /*
> + * Do not use 'isa' recorded in kvm_exit tracepoint since it is not
> + * traced in the old kernel.
> + */
> + ret = get_cpu_isa(kvm_session);
> +
> + if (ret < 0)
> + return ret;
> +
> + cpu_isa = ret;
> +
> + return perf_session__process_events(kvm_session, &eops);
> +}
> +
> +static bool verify_vcpu(int vcpu)
> +{
> + if (vcpu != -1 && vcpu < 0) {
> + pr_err("Invalid vcpu:%d.\n", vcpu);
> + return false;
> + }
> +
> + return true;
> +}
> +
> +static int kvm_events_report_vcpu(int vcpu)
> +{
> + int ret = -EINVAL;
> +
> + if (!verify_vcpu(vcpu))
> + goto exit;
> +
> + if (!select_key())
> + goto exit;
> +
> + if (!register_kvm_events_ops())
> + goto exit;
> +
> + init_kvm_event_record();
> + setup_pager();
> +
> + ret = read_events();
> + if (ret)
> + goto exit;
> +
> + sort_result(vcpu);
> + print_result(vcpu);
> +exit:
> + return ret;
> +}
> +
> +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_io_done"
> +};
> +
> +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;
> +}
> +
> +#define STRDUP_FAIL_EXIT(s) \
> + ({ char *_p; \
> + _p = strdup(s); \
> + if (!_p) \
> + return -ENOMEM; \
> + _p; \
> + })
> +
> +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_FAIL_EXIT(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_FAIL_EXIT("-a");
> +
> + rec_argv[i++] = STRDUP_FAIL_EXIT("-o");
> + rec_argv[i++] = STRDUP_FAIL_EXIT(file_name);
> +
> + for (j = 0; j < ARRAY_SIZE(new_event); j++)
> + if (is_valid_tracepoint(new_event[j])) {
> + char event[256];
> +
> + sprintf(event, "kvm:%s", new_event[j]);
> +
> + rec_argv[i++] = STRDUP_FAIL_EXIT("-e");
> + rec_argv[i++] = STRDUP_FAIL_EXIT(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 +1016,8 @@ 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 1e5b6aa..c684aba 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -1504,9 +1504,15 @@ 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;
> @@ -1521,6 +1527,9 @@ 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
> @@ -1535,7 +1544,7 @@ 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),
> @@ -1589,6 +1598,49 @@ 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 24962e7..3b65aca 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..f66610b 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 *priv;
> };
>
> struct machine;
>
--
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