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authorLei Zhao <zhaolei27@baidu.com>2021-04-15 15:00:01 +0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2021-05-12 12:43:12 -0300
commit046b243a6afb74d276ca52a81be62aed9a90672b (patch)
tree2c483ca0e89777c448e30f4b2187fcb9fa2a4576 /tools/perf/arch
parent07b747f99ab47a167cfae5f5588ca22f4e0da7fe (diff)
downloadlinux-046b243a6afb74d276ca52a81be62aed9a90672b.tar.bz2
perf x86 kvm-stat: Support to analyze kvm MSR
usage: - kvm stat run a command and gather performance counter statistics - show the result: perf kvm stat report --event=msr See the msr events: Analyze events for all VMs, all VCPUs: MSR Access Samples Samples% Time% Min Time Max Time Avg time 0x6e0:W 67007 98.17% 98.31% 0.59us 10.69us 0.90us ( +- 0.10% ) 0x830:W 1186 1.74% 1.60% 0.53us 108.34us 0.82us ( +- 11.02% ) 0x3b:R 66 0.10% 0.09% 0.56us 1.26us 0.80us ( +- 3.24% ) Total Samples:68259, Total events handled time:61150.95us. Signed-off-by: Lei Zhao <zhaolei27@baidu.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lore.kernel.org/lkml/1618470001-7239-1-git-send-email-lirongqing@baidu.com Signed-off-by: Li RongQing <lirongqing@baidu.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/arch')
-rw-r--r--tools/perf/arch/x86/util/kvm-stat.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/tools/perf/arch/x86/util/kvm-stat.c b/tools/perf/arch/x86/util/kvm-stat.c
index 072920475b65..c5dd54f6ef5e 100644
--- a/tools/perf/arch/x86/util/kvm-stat.c
+++ b/tools/perf/arch/x86/util/kvm-stat.c
@@ -133,11 +133,56 @@ static struct kvm_events_ops ioport_events = {
.name = "IO Port Access"
};
+ /* The time of emulation msr is from kvm_msr to kvm_entry. */
+static void msr_event_get_key(struct evsel *evsel,
+ struct perf_sample *sample,
+ struct event_key *key)
+{
+ key->key = evsel__intval(evsel, sample, "ecx");
+ key->info = evsel__intval(evsel, sample, "write");
+}
+
+static bool msr_event_begin(struct evsel *evsel,
+ struct perf_sample *sample,
+ struct event_key *key)
+{
+ if (!strcmp(evsel->name, "kvm:kvm_msr")) {
+ msr_event_get_key(evsel, sample, key);
+ return true;
+ }
+
+ return false;
+}
+
+static bool msr_event_end(struct evsel *evsel,
+ struct perf_sample *sample __maybe_unused,
+ struct event_key *key __maybe_unused)
+{
+ return kvm_entry_event(evsel);
+}
+
+static void msr_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
+ struct event_key *key,
+ char *decode)
+{
+ scnprintf(decode, decode_str_len, "%#llx:%s",
+ (unsigned long long)key->key,
+ key->info ? "W" : "R");
+}
+
+static struct kvm_events_ops msr_events = {
+ .is_begin_event = msr_event_begin,
+ .is_end_event = msr_event_end,
+ .decode_key = msr_event_decode_key,
+ .name = "MSR Access"
+};
+
const char *kvm_events_tp[] = {
"kvm:kvm_entry",
"kvm:kvm_exit",
"kvm:kvm_mmio",
"kvm:kvm_pio",
+ "kvm:kvm_msr",
NULL,
};
@@ -145,6 +190,7 @@ struct kvm_reg_events_ops kvm_reg_events_ops[] = {
{ .name = "vmexit", .ops = &exit_events },
{ .name = "mmio", .ops = &mmio_events },
{ .name = "ioport", .ops = &ioport_events },
+ { .name = "msr", .ops = &msr_events },
{ NULL, NULL },
};