linux-kernel - [patch 04/12] rseq: Add statistics for time slice extensions

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Message-ID: <20250908225752.808973324@linutronix.de>
Date: Tue,  9 Sep 2025 00:59:56 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
cc: Peter Zilstra <peterz@...radead.org>,
 Peter Zijlstra <peterz@...radead.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 "Paul E. McKenney" <paulmck@...nel.org>,
 Boqun Feng <boqun.feng@...il.com>,
 Jonathan Corbet <corbet@....net>,
 Prakash Sangappa <prakash.sangappa@...cle.com>,
 Madadi Vineeth Reddy <vineethr@...ux.ibm.com>,
 K Prateek Nayak <kprateek.nayak@....com>,
 Steven Rostedt <rostedt@...dmis.org>,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 Arnd Bergmann <arnd@...db.de>,
 linux-arch@...r.kernel.org
Subject: [patch 04/12] rseq: Add statistics for time slice extensions

Extend the quick statistics with time slice specific fields.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 include/linux/rseq_entry.h |    4 ++++
 kernel/rseq.c              |   12 ++++++++++++
 2 files changed, 16 insertions(+)

--- a/include/linux/rseq_entry.h
+++ b/include/linux/rseq_entry.h
@@ -15,6 +15,10 @@ struct rseq_stats {
 	unsigned long	cs;
 	unsigned long	clear;
 	unsigned long	fixup;
+	unsigned long	s_granted;
+	unsigned long	s_expired;
+	unsigned long	s_revoked;
+	unsigned long	s_yielded;
 };

 DECLARE_PER_CPU(struct rseq_stats, rseq_stats);
--- a/kernel/rseq.c
+++ b/kernel/rseq.c
@@ -138,6 +138,12 @@ static int rseq_stats_show(struct seq_fi
 		stats.cs	+= data_race(per_cpu(rseq_stats.cs, cpu));
 		stats.clear	+= data_race(per_cpu(rseq_stats.clear, cpu));
 		stats.fixup	+= data_race(per_cpu(rseq_stats.fixup, cpu));
+		if (IS_ENABLED(CONFIG_RSEQ_SLICE_EXTENSION)) {
+			stats.s_granted	+= data_race(per_cpu(rseq_stats.s_granted, cpu));
+			stats.s_expired	+= data_race(per_cpu(rseq_stats.s_expired, cpu));
+			stats.s_revoked	+= data_race(per_cpu(rseq_stats.s_revoked, cpu));
+			stats.s_yielded	+= data_race(per_cpu(rseq_stats.s_yielded, cpu));
+		}
 	}

 	seq_printf(m, "exit:   %16lu\n", stats.exit);
@@ -148,6 +154,12 @@ static int rseq_stats_show(struct seq_fi
 	seq_printf(m, "cs:     %16lu\n", stats.cs);
 	seq_printf(m, "clear:  %16lu\n", stats.clear);
 	seq_printf(m, "fixup:  %16lu\n", stats.fixup);
+	if (IS_ENABLED(CONFIG_RSEQ_SLICE_EXTENSION)) {
+		seq_printf(m, "sgrant: %16lu\n", stats.s_granted);
+		seq_printf(m, "sexpir: %16lu\n", stats.s_expired);
+		seq_printf(m, "srevok: %16lu\n", stats.s_revoked);
+		seq_printf(m, "syield: %16lu\n", stats.s_yielded);
+	}
 	return 0;
 }