Commit-ID: 3be8e2a0a53c3179a44a933614f6a893da0b5c19
Gitweb: http://git.kernel.org/tip/3be8e2a0a53c3179a44a933614f6a893da0b5c19
Author: Alexander Yarygin <yarygin@xxxxxxxxxxxxxxxxxx>
AuthorDate: Thu, 3 Jul 2014 18:29:07 +0400
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 16 Jul 2014 17:57:33 -0300
perf kvm: Add stat support on s390
On s390, the vmexit event has a tree-like structure: between
exit_event_begin and exit_event_end several other events may happen and
with each of them refining the previous ones.
This patch adds a decoder for such events to the generic code and also
the files <asm/kvm_perf.h> and kvm-stat.c for s390.
Commands 'perf kvm stat record', 'report' and 'live' are supported.
Reviewed-by: David Ahern <dsahern@xxxxxxxxx>
Signed-off-by: Alexander Yarygin <yarygin@xxxxxxxxxxxxxxxxxx>
Acked-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Cc: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1404397747-20939-5-git-send-email-yarygin@xxxxxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
arch/s390/include/uapi/asm/Kbuild | 1 +
arch/s390/include/uapi/asm/kvm_perf.h | 25 ++++++++
tools/perf/Documentation/perf-kvm.txt | 16 +++---
tools/perf/MANIFEST | 2 +
tools/perf/arch/s390/Makefile | 2 +
tools/perf/arch/s390/util/kvm-stat.c | 105 ++++++++++++++++++++++++++++++++++
tools/perf/builtin-kvm.c | 52 +++++++++++++++--
tools/perf/util/kvm-stat.h | 9 +++
8 files changed, 201 insertions(+), 11 deletions(-)
diff --git a/arch/s390/include/uapi/asm/Kbuild b/arch/s390/include/uapi/asm/Kbuild
index 6a9a9eb..0e2b54d 100644
--- a/arch/s390/include/uapi/asm/Kbuild
+++ b/arch/s390/include/uapi/asm/Kbuild
@@ -16,6 +16,7 @@ header-y += ioctls.h
header-y += ipcbuf.h
header-y += kvm.h
header-y += kvm_para.h
+header-y += kvm_perf.h
header-y += kvm_virtio.h
header-y += mman.h
header-y += monwriter.h
diff --git a/arch/s390/include/uapi/asm/kvm_perf.h b/arch/s390/include/uapi/asm/kvm_perf.h
new file mode 100644
index 0000000..3972827
--- /dev/null
+++ b/arch/s390/include/uapi/asm/kvm_perf.h
@@ -0,0 +1,25 @@
+/*
+ * Definitions for perf-kvm on s390
+ *
+ * Copyright 2014 IBM Corp.
+ * Author(s): Alexander Yarygin <yarygin@xxxxxxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ */
+
+#ifndef __LINUX_KVM_PERF_S390_H
+#define __LINUX_KVM_PERF_S390_H
+
+#include <asm/sie.h>
+
+#define DECODE_STR_LEN 40
+
+#define VCPU_ID "id"
+
+#define KVM_ENTRY_TRACE "kvm:kvm_s390_sie_enter"
+#define KVM_EXIT_TRACE "kvm:kvm_s390_sie_exit"
+#define KVM_EXIT_REASON "icptcode"
+
+#endif
diff --git a/tools/perf/Documentation/perf-kvm.txt b/tools/perf/Documentation/perf-kvm.txt
index 52276a6..6e689dc 100644
--- a/tools/perf/Documentation/perf-kvm.txt
+++ b/tools/perf/Documentation/perf-kvm.txt
@@ -51,9 +51,9 @@ There are a couple of variants of perf kvm:
'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>.
+ of KVM events. Currently, vmexit, mmio (x86 only) and ioport (x86 only)
+ 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.
@@ -103,8 +103,8 @@ STAT REPORT OPTIONS
analyze events which occures on this vcpu. (default: all vcpus)
--event=<value>::
- event to be analyzed. Possible values: vmexit, mmio, ioport.
- (default: vmexit)
+ event to be analyzed. Possible values: vmexit, mmio (x86 only),
+ ioport (x86 only). (default: vmexit)
-k::
--key=<value>::
Sorting key. Possible values: sample (default, sort by samples
@@ -138,7 +138,8 @@ STAT LIVE OPTIONS
--event=<value>::
- event to be analyzed. Possible values: vmexit, mmio, ioport.
+ event to be analyzed. Possible values: vmexit,
+ mmio (x86 only), ioport (x86 only).
(default: vmexit)
-k::
@@ -147,7 +148,8 @@ STAT LIVE OPTIONS
number), time (sort by average time).
--duration=<value>::
- Show events other than HLT that take longer than duration usecs.
+ Show events other than HLT (x86 only) or Wait state (s390 only)
+ that take longer than duration usecs.
SEE ALSO
--------
diff --git a/tools/perf/MANIFEST b/tools/perf/MANIFEST
index 02b485d..344c4d3 100644
--- a/tools/perf/MANIFEST
+++ b/tools/perf/MANIFEST
@@ -38,3 +38,5 @@ arch/x86/include/uapi/asm/svm.h
arch/x86/include/uapi/asm/vmx.h
arch/x86/include/uapi/asm/kvm.h
arch/x86/include/uapi/asm/kvm_perf.h
+arch/s390/include/uapi/asm/sie.h
+arch/s390/include/uapi/asm/kvm_perf.h
diff --git a/tools/perf/arch/s390/Makefile b/tools/perf/arch/s390/Makefile
index 744e629..798ac73 100644
--- a/tools/perf/arch/s390/Makefile
+++ b/tools/perf/arch/s390/Makefile
@@ -3,3 +3,5 @@ PERF_HAVE_DWARF_REGS := 1
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
endif
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/header.o
+HAVE_KVM_STAT_SUPPORT := 1
+LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/kvm-stat.o
diff --git a/tools/perf/arch/s390/util/kvm-stat.c b/tools/perf/arch/s390/util/kvm-stat.c
new file mode 100644
index 0000000..a5dbc07
--- /dev/null
+++ b/tools/perf/arch/s390/util/kvm-stat.c
@@ -0,0 +1,105 @@
+/*
+ * Arch specific functions for perf kvm stat.
+ *
+ * Copyright 2014 IBM Corp.
+ * Author(s): Alexander Yarygin <yarygin@xxxxxxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ */
+
+#include "../../util/kvm-stat.h"
+#include <asm/kvm_perf.h>
+
+define_exit_reasons_table(sie_exit_reasons, sie_intercept_code);
+define_exit_reasons_table(sie_icpt_insn_codes, icpt_insn_codes);
+define_exit_reasons_table(sie_sigp_order_codes, sigp_order_codes);
+define_exit_reasons_table(sie_diagnose_codes, diagnose_codes);
+define_exit_reasons_table(sie_icpt_prog_codes, icpt_prog_codes);
+
+static void event_icpt_insn_get_key(struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct event_key *key)
+{
+ unsigned long insn;
+
+ insn = perf_evsel__intval(evsel, sample, "instruction");
+ key->key = icpt_insn_decoder(insn);
+ key->exit_reasons = sie_icpt_insn_codes;
+}
+
+static void event_sigp_get_key(struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct event_key *key)
+{
+ key->key = perf_evsel__intval(evsel, sample, "order_code");
+ key->exit_reasons = sie_sigp_order_codes;
+}
+
+static void event_diag_get_key(struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct event_key *key)
+{
+ key->key = perf_evsel__intval(evsel, sample, "code");
+ key->exit_reasons = sie_diagnose_codes;
+}
+
+static void event_icpt_prog_get_key(struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct event_key *key)
+{
+ key->key = perf_evsel__intval(evsel, sample, "code");
+ key->exit_reasons = sie_icpt_prog_codes;
+}
+
+static struct child_event_ops child_events[] = {
+ { .name = "kvm:kvm_s390_intercept_instruction",
+ .get_key = event_icpt_insn_get_key },
+ { .name = "kvm:kvm_s390_handle_sigp",
+ .get_key = event_sigp_get_key },
+ { .name = "kvm:kvm_s390_handle_diag",
+ .get_key = event_diag_get_key },
+ { .name = "kvm:kvm_s390_intercept_prog",
+ .get_key = event_icpt_prog_get_key },
+ { NULL, NULL },
+};
+
+static struct kvm_events_ops exit_events = {
+ .is_begin_event = exit_event_begin,
+ .is_end_event = exit_event_end,
+ .child_ops = child_events,
+ .decode_key = exit_event_decode_key,
+ .name = "VM-EXIT"
+};
+
+const char * const kvm_events_tp[] = {
+ "kvm:kvm_s390_sie_enter",
+ "kvm:kvm_s390_sie_exit",
+ "kvm:kvm_s390_intercept_instruction",
+ "kvm:kvm_s390_handle_sigp",
+ "kvm:kvm_s390_handle_diag",
+ "kvm:kvm_s390_intercept_prog",
+ NULL,
+};
+
+struct kvm_reg_events_ops kvm_reg_events_ops[] = {
+ { .name = "vmexit", .ops = &exit_events },
+ { NULL, NULL },
+};
+
+const char * const kvm_skip_events[] = {
+ "Wait state",
+ NULL,
+};
+
+int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid)
+{
+ if (strstr(cpuid, "IBM/S390")) {
+ kvm->exit_reasons = sie_exit_reasons;
+ kvm->exit_reasons_isa = "SIE";
+ } else
+ return -ENOTSUP;
+
+ return 0;
+}
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index fc2d63d..43367eb 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -88,7 +88,7 @@ void exit_event_decode_key(struct perf_kvm_stat *kvm,
struct event_key *key,
char *decode)
{
- const char *exit_reason = get_exit_reason(kvm, kvm->exit_reasons,
+ const char *exit_reason = get_exit_reason(kvm, key->exit_reasons,
key->key);
scnprintf(decode, DECODE_STR_LEN, "%s", exit_reason);
@@ -261,6 +261,43 @@ static bool update_kvm_event(struct kvm_event *event, int vcpu_id,
return true;
}
+static bool is_child_event(struct perf_kvm_stat *kvm,
+ struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct event_key *key)
+{
+ struct child_event_ops *child_ops;
+
+ child_ops = kvm->events_ops->child_ops;
+
+ if (!child_ops)
+ return false;
+
+ for (; child_ops->name; child_ops++) {
+ if (!strcmp(evsel->name, child_ops->name)) {
+ child_ops->get_key(evsel, sample, key);
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool handle_child_event(struct perf_kvm_stat *kvm,
+ struct vcpu_event_record *vcpu_record,
+ struct event_key *key,
+ struct perf_sample *sample __maybe_unused)
+{
+ struct kvm_event *event = NULL;
+
+ if (key->key != INVALID_KEY)
+ event = find_create_kvm_event(kvm, key);
+
+ vcpu_record->last_event = event;
+
+ return true;
+}
+
static bool skip_event(const char *event)
{
const char * const *skip_events;
@@ -361,7 +398,8 @@ static bool handle_kvm_event(struct perf_kvm_stat *kvm,
struct perf_sample *sample)
{
struct vcpu_event_record *vcpu_record;
- struct event_key key = {.key = INVALID_KEY};
+ struct event_key key = { .key = INVALID_KEY,
+ .exit_reasons = kvm->exit_reasons };
vcpu_record = per_vcpu_record(thread, evsel, sample);
if (!vcpu_record)
@@ -375,6 +413,9 @@ static bool handle_kvm_event(struct perf_kvm_stat *kvm,
if (kvm->events_ops->is_begin_event(evsel, sample, &key))
return handle_begin_event(kvm, vcpu_record, &key, sample->time);
+ if (is_child_event(kvm, evsel, sample, &key))
+ return handle_child_event(kvm, vcpu_record, &key, sample);
+
if (kvm->events_ops->is_end_event(evsel, sample, &key))
return handle_end_event(kvm, vcpu_record, &key, sample);
@@ -1143,7 +1184,8 @@ kvm_events_report(struct perf_kvm_stat *kvm, int argc, const char **argv)
{
const struct option kvm_events_report_options[] = {
OPT_STRING(0, "event", &kvm->report_event, "report event",
- "event for reporting: vmexit, mmio, ioport"),
+ "event for reporting: vmexit, "
+ "mmio (x86 only), ioport (x86 only)"),
OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
"vcpu id to report"),
OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
@@ -1249,7 +1291,9 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
"key for sorting: sample(sort by samples number)"
" time (sort by avg time)"),
OPT_U64(0, "duration", &kvm->duration,
- "show events other than HALT that take longer than duration usecs"),
+ "show events other than"
+ " HLT (x86 only) or Wait state (s390 only)"
+ " that take longer than duration usecs"),
OPT_END()
};
const char * const live_usage[] = {
diff --git a/tools/perf/util/kvm-stat.h b/tools/perf/util/kvm-stat.h
index ba937ca..0b5a8cd 100644
--- a/tools/perf/util/kvm-stat.h
+++ b/tools/perf/util/kvm-stat.h
@@ -12,6 +12,7 @@ struct event_key {
#define INVALID_KEY (~0ULL)
u64 key;
int info;
+ struct exit_reasons_table *exit_reasons;
};
struct kvm_event_stats {
@@ -41,12 +42,20 @@ struct kvm_event_key {
struct perf_kvm_stat;
+struct child_event_ops {
+ void (*get_key)(struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct event_key *key);
+ const char *name;
+};
+
struct kvm_events_ops {
bool (*is_begin_event)(struct perf_evsel *evsel,
struct perf_sample *sample,
struct event_key *key);
bool (*is_end_event)(struct perf_evsel *evsel,
struct perf_sample *sample, struct event_key *key);
+ struct child_event_ops *child_ops;
void (*decode_key)(struct perf_kvm_stat *kvm, struct event_key *key,
char *decode);
const char *name;
--
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