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Message-Id: <20221103200359.328736-25-mathieu.desnoyers@efficios.com>
Date: Thu, 3 Nov 2022 16:03:59 -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>,
Chris Kennelly <ckennelly@...gle.com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [PATCH v5 24/24] 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 dde7a359b4ef..9106148227c0 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(__entry->cpu_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
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