linux-kernel - [tip: smp/core] trace: Add trace_ipi_send

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Message-ID: <167999248655.5837.17253281331535612099.tip-bot2@tip-bot2>
Date:   Tue, 28 Mar 2023 08:34:46 -0000
From:   "tip-bot2 for Valentin Schneider" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Valentin Schneider <vschneid@...hat.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: smp/core] trace: Add trace_ipi_send_cpumask()

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

Commit-ID:     56eb0598c7a30c76009a082d3213486d6a013df0
Gitweb:        https://git.kernel.org/tip/56eb0598c7a30c76009a082d3213486d6a013df0
Author:        Valentin Schneider <vschneid@...hat.com>
AuthorDate:    Tue, 07 Mar 2023 14:35:52 
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 24 Mar 2023 11:01:26 +01:00

trace: Add trace_ipi_send_cpumask()

trace_ipi_raise() is unsuitable for generically tracing IPI sources due to
its "reason" argument being an uninformative string (on arm64 all you get
is "Function call interrupts" for SMP calls).

Add a variant of it that exports a target cpumask, a callsite and a callback.

Signed-off-by: Valentin Schneider <vschneid@...hat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@...dmis.org>
Link: https://lore.kernel.org/r/20230307143558.294354-2-vschneid@redhat.com
---
 include/trace/events/ipi.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/include/trace/events/ipi.h b/include/trace/events/ipi.h
index 0be71da..b1125dc 100644
--- a/include/trace/events/ipi.h
+++ b/include/trace/events/ipi.h
@@ -35,6 +35,28 @@ TRACE_EVENT(ipi_raise,
 	TP_printk("target_mask=%s (%s)", __get_bitmask(target_cpus), __entry->reason)
 );
 
+TRACE_EVENT(ipi_send_cpumask,
+
+	TP_PROTO(const struct cpumask *cpumask, unsigned long callsite, void *callback),
+
+	TP_ARGS(cpumask, callsite, callback),
+
+	TP_STRUCT__entry(
+		__cpumask(cpumask)
+		__field(void *, callsite)
+		__field(void *, callback)
+	),
+
+	TP_fast_assign(
+		__assign_cpumask(cpumask, cpumask_bits(cpumask));
+		__entry->callsite = (void *)callsite;
+		__entry->callback = callback;
+	),
+
+	TP_printk("cpumask=%s callsite=%pS callback=%pS",
+		  __get_cpumask(cpumask), __entry->callsite, __entry->callback)
+);
+
 DECLARE_EVENT_CLASS(ipi_handler,
 
 	TP_PROTO(const char *reason),