[tip: sched/core] rseq: Add statistics for time slice extensions

["tip-bot2 for Thomas Gleixner" <tip-bot2@linutronix.de>]

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     b5b8282441bc4f8f1ff505e19d566dbd7b805761
Gitweb:        https://git.kernel.org/tip/b5b8282441bc4f8f1ff505e19d566dbd7b805761
Author:        Thomas Gleixner <tglx@linutronix.de>
AuthorDate:    Mon, 15 Dec 2025 17:52:09 +01:00
Committer:     Peter Zijlstra <peterz@infradead.org>
CommitterDate: Thu, 22 Jan 2026 11:11:17 +01:00

rseq: Add statistics for time slice extensions

Extend the quick statistics with time slice specific fields.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251215155708.795202254@linutronix.de
---
 include/linux/rseq_entry.h |  5 +++++
 kernel/rseq.c              | 14 ++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/include/linux/rseq_entry.h b/include/linux/rseq_entry.h
index d0ec471..54d8e33 100644
--- a/include/linux/rseq_entry.h
+++ b/include/linux/rseq_entry.h
@@ -15,6 +15,11 @@ 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;
+	unsigned long	s_aborted;
 };
 
 DECLARE_PER_CPU(struct rseq_stats, rseq_stats);
diff --git a/kernel/rseq.c b/kernel/rseq.c
index bf75268..415d75b 100644
--- a/kernel/rseq.c
+++ b/kernel/rseq.c
@@ -138,6 +138,13 @@ static int rseq_stats_show(struct seq_file *m, void *p)
 		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));
+			stats.s_aborted	+= data_race(per_cpu(rseq_stats.s_aborted, cpu));
+		}
 	}
 
 	seq_printf(m, "exit:   %16lu\n", stats.exit);
@@ -148,6 +155,13 @@ static int rseq_stats_show(struct seq_file *m, void *p)
 	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);
+		seq_printf(m, "sabort: %16lu\n", stats.s_aborted);
+	}
 	return 0;
 }