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perf x86 kvm-stat: Support to analyze kvm MSR

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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>
This commit is contained in:
Lei Zhao 2021-04-15 15:00:01 +08:00 • committed by Arnaldo Carvalho de Melo
parent 07b747f99a
commit 046b243a6a
1 changed files with 46 additions and 0 deletions
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46
tools/perf/arch/x86/util/kvm-stat.c
View file

@ -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 },
};