* [PATCH] perf kvm: Fix arm64 VM-exit duration accounting
@ 2026-10-31 12:01 lirongqing
2026-10-31 12:05 ` sashiko-bot
0 siblings, 1 reply; 2+ messages in thread
From: lirongqing @ 2026-10-31 12:01 UTC (permalink / raw)
To: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
Namhyung Kim, Mark Rutland, Alexander Shishkin, Jiri Olsa,
Ian Rogers, Adrian Hunter, James Clark, Li RongQing,
Sergey Senozhatsky, Leo Yan, linux-perf-users, linux-kernel
From: Li RongQing <lirongqing@baidu.com>
Use kvm_exit as the start event and the following kvm_entry as the
end event for arm64 VM-exit statistics. Keep decoding ret and esr_ec
from the exit sample.
Before this change, arm64 measured guest runtime as VM-exit time.
Fixes: 1218838d68f5 ("perf kvm: Add kvm-stat for arm64")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
---
tools/perf/util/kvm-stat-arch/kvm-stat-arm64.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/tools/perf/util/kvm-stat-arch/kvm-stat-arm64.c b/tools/perf/util/kvm-stat-arch/kvm-stat-arm64.c
index 018b0db..ff853ef 100644
--- a/tools/perf/util/kvm-stat-arch/kvm-stat-arm64.c
+++ b/tools/perf/util/kvm-stat-arch/kvm-stat-arm64.c
@@ -36,13 +36,7 @@ static void event_get_key(struct perf_sample *sample,
}
static bool event_begin(struct perf_sample *sample,
- struct event_key *key __maybe_unused)
-{
- return evsel__name_is(sample->evsel, kvm_entry_trace(EM_AARCH64));
-}
-
-static bool event_end(struct perf_sample *sample,
- struct event_key *key)
+ struct event_key *key)
{
if (evsel__name_is(sample->evsel, kvm_exit_trace(EM_AARCH64))) {
event_get_key(sample, key);
@@ -51,6 +45,12 @@ static bool event_end(struct perf_sample *sample,
return false;
}
+static bool event_end(struct perf_sample *sample,
+ struct event_key *key __maybe_unused)
+{
+ return evsel__name_is(sample->evsel, kvm_entry_trace(EM_AARCH64));
+}
+
static const struct kvm_events_ops exit_events = {
.is_begin_event = event_begin,
.is_end_event = event_end,
--
2.9.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] perf kvm: Fix arm64 VM-exit duration accounting
2026-10-31 12:01 [PATCH] perf kvm: Fix arm64 VM-exit duration accounting lirongqing
@ 2026-10-31 12:05 ` sashiko-bot
0 siblings, 0 replies; 2+ messages in thread
From: sashiko-bot @ 2026-10-31 12:05 UTC (permalink / raw)
To: lirongqing, linux-perf-users
> From: Li RongQing <lirongqing@baidu.com>
>
> Use kvm_exit as the start event and the following kvm_entry as the
> end event for arm64 VM-exit statistics. Keep decoding ret and esr_ec
> from the exit sample.
>
> Before this change, arm64 measured guest runtime as VM-exit time.
>
> Fixes: 1218838d68f5 ("perf kvm: Add kvm-stat for arm64")
> Signed-off-by: Li RongQing <lirongqing@baidu.com>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261031120123.2312-1-lirongqing@baidu.com?part=1
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