linux-kernel - [PATCH 5/5] perf tools kvm: Use "cycles" to sample guest for "kvm top" on Intel

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Message-Id: <20250805004633.135904-6-dapeng1.mi@linux.intel.com>
Date: Tue,  5 Aug 2025 08:46:33 +0800
From: Dapeng Mi <dapeng1.mi@...ux.intel.com>
To: Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Kan Liang <kan.liang@...ux.intel.com>
Cc: linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kevin Tian <kevin.tian@...el.com>,
	Dapeng Mi <dapeng1.mi@...el.com>,
	Dapeng Mi <dapeng1.mi@...ux.intel.com>
Subject: [PATCH 5/5] perf tools kvm: Use "cycles" to sample guest for "kvm top" on Intel

As same reason with previous patch, use "cyles" instead of "cycles:P"
event by default to sample guest for "perf kvm top" command on Intel
platforms.

Reported-by: Kevin Tian <kevin.tian@...el.com>
Fixes: 634d36f82517 ("perf record: Just use "cycles:P" as the default event")
Signed-off-by: Dapeng Mi <dapeng1.mi@...ux.intel.com>
---
 tools/perf/builtin-kvm.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 7e48d2437710..d72b40f3df12 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -2075,6 +2075,34 @@ __cmd_buildid_list(const char *file_name, int argc, const char **argv)
 	return ret;
 }
 
+static int __cmd_top(int argc, const char **argv)
+{
+	int i = 0, ret;
+	const char **rec_argv;
+
+	/*
+	 * kvm_add_default_arch_event() may add 2 extra options, so
+	 * allocate 2 more pointers in adavance.
+	 */
+	rec_argv = calloc(argc + 2 + 1, sizeof(char *));
+	if (!rec_argv)
+		return -ENOMEM;
+
+	for (i = 0; i < argc; i++)
+		rec_argv[i] = argv[i];
+
+	BUG_ON(i != argc);
+
+	ret = kvm_add_default_arch_event(&i, rec_argv);
+	if (ret)
+		return -EINVAL;
+
+	ret = cmd_top(i, rec_argv);
+	free(rec_argv);
+
+	return ret;
+}
+
 int cmd_kvm(int argc, const char **argv)
 {
 	const char *file_name = NULL;
@@ -2135,7 +2163,7 @@ int cmd_kvm(int argc, const char **argv)
 	else if (strlen(argv[0]) > 2 && strstarts("diff", argv[0]))
 		return cmd_diff(argc, argv);
 	else if (!strcmp(argv[0], "top"))
-		return cmd_top(argc, argv);
+		return __cmd_top(argc, argv);
 	else if (strlen(argv[0]) > 2 && strstarts("buildid-list", argv[0]))
 		return __cmd_buildid_list(file_name, argc, argv);
 #if defined(HAVE_KVM_STAT_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
-- 
2.34.1