linux-kernel - [PATCH v4.1 25/25] tracing/rseq: Add mm_vcpu_id field to rseq

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Message-Id: <20220922153304.281881-1-mathieu.desnoyers@efficios.com>
Date:   Thu, 22 Sep 2022 11:33:04 -0400
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        "H . Peter Anvin" <hpa@...or.com>, Paul Turner <pjt@...gle.com>,
        linux-api@...r.kernel.org, Christian Brauner <brauner@...nel.org>,
        Florian Weimer <fw@...eb.enyo.de>, David.Laight@...LAB.COM,
        carlos@...hat.com, Peter Oskolkov <posk@...k.io>,
        Alexander Mikhalitsyn <alexander@...alicyn.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [PATCH v4.1 25/25] tracing/rseq: Add mm_vcpu_id field to rseq_update

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@...icios.com>
---
Changes since v4:
- use task_mm_vcpu_id() to get the mm_vcpu_id from the task struct.
---
 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..cef5a91a9ba0 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 = task_mm_vcpu_id(t);
 	),
 
-	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