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From:   Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
        "Paul E . McKenney" <paulmck@kernel.org>,
        Boqun Feng <boqun.feng@gmail.com>,
        "H . Peter Anvin" <hpa@zytor.com>, Paul Turner <pjt@google.com>,
        linux-api@vger.kernel.org, Christian Brauner <brauner@kernel.org>,
        Florian Weimer <fw@deneb.enyo.de>, David.Laight@ACULAB.COM,
        carlos@redhat.com, Peter Oskolkov <posk@posk.io>,
        Alexander Mikhalitsyn <alexander@mihalicyn.com>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Subject: [PATCH v4 25/25] tracing/rseq: Add mm_vcpu_id field to rseq_update
Date:   Thu, 22 Sep 2022 06:59:40 -0400
Message-Id: <20220922105941.237830-26-mathieu.desnoyers@efficios.com>
In-Reply-To: <20220922105941.237830-1-mathieu.desnoyers@efficios.com>
References: <20220922105941.237830-1-mathieu.desnoyers@efficios.com>
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Add the mm_vcpu_id field to the rseq_update event, allowing tracers to
follow which vcpu_id is observed by user-space, and whether negative
vcpu_id values are visible in case of internal scheduler implementation
issues.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
 include/trace/events/rseq.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/trace/events/rseq.h b/include/trace/events/rseq.h
index 6bd442697354..10b236fc047a 100644
--- a/include/trace/events/rseq.h
+++ b/include/trace/events/rseq.h
@@ -17,14 +17,17 @@ TRACE_EVENT(rseq_update,
 	TP_STRUCT__entry(
 		__field(s32, cpu_id)
 		__field(s32, node_id)
+		__field(s32, mm_vcpu_id)
 	),
 
 	TP_fast_assign(
 		__entry->cpu_id = raw_smp_processor_id();
 		__entry->node_id = cpu_to_node(raw_smp_processor_id());
+		__entry->mm_vcpu_id = t->mm_vcpu;
 	),
 
-	TP_printk("cpu_id=%d node_id=%d", __entry->cpu_id, __entry->node_id)
+	TP_printk("cpu_id=%d node_id=%d mm_vcpu_id=%d", __entry->cpu_id,
+		  __entry->node_id, __entry->mm_vcpu_id)
 );
 
 TRACE_EVENT(rseq_ip_fixup,
-- 
2.25.1