pmc: new pmc log processing framework

View is a class for building PMC log processing tools it is designed to
work with the new PMC record command that adds a header with additional
CPU information.  The new framework processes PMC logs about 2.5 times
faster and in about half the code as libpmcstat.

Sponsored by: Netflix
Reviewed by:	adrian
Differential Revision:	https://reviews.freebsd.org/D57776

1 files changed, 82 insertions, 0 deletions

diff --git a/usr.sbin/pmc/util.cc b/usr.sbin/pmc/util.cc
new file mode 100644
index 000000000000..b6e43b9dd130
--- /dev/null
+++ b/usr.sbin/pmc/util.cc
@@ -0,0 +1,82 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2026, Netflix, Inc.
+ *
+ * This software was developed by Ali Mashtizadeh under the sponsorship from
+ * Netflix, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#include <string>
+#include <unordered_set>
+
+#include "util.hh"
+
+std::string
+basename(const std::string &path)
+{
+	size_t s;
+
+	s = path.rfind("/");
+	if (s == std::string::npos)
+		return (path);
+	else
+		return (path.substr(s + 1));
+}
+
+void
+split_and_insert(std::unordered_set<int> *set, const std::string &str)
+{
+	size_t pos = 0;
+
+	while (pos < str.length()) {
+		size_t end = str.find(",", pos);
+		if (end == str.npos) {
+			set->insert(std::stoi(str.substr(pos)));
+			break;
+		}
+
+		set->insert(std::stoi(str.substr(pos, end - pos)));
+		pos = end + 1;
+	}
+}
+
+void
+split_and_insert(std::unordered_set<std::string> *set, const std::string &str)
+{
+	size_t pos = 0;
+
+	while (pos < str.length()) {
+		size_t end = str.find(",", pos);
+		if (end == str.npos) {
+			set->insert(str.substr(pos));
+			break;
+		}
+
+		set->insert(str.substr(pos, end - pos));
+		pos = end + 1;
+	}
+}
+