linux-kernel - [RFC PATCH 1/5] trace: Add trace_ipi_send

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Date:   Fri,  7 Oct 2022 16:45:29 +0100
From:   Valentin Schneider <vschneid@...hat.com>
To:     linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
        loongarch@...ts.linux.dev, linux-mips@...r.kernel.org,
        openrisc@...ts.librecores.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
        x86@...nel.org
Cc:     "Paul E. McKenney" <paulmck@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Juri Lelli <juri.lelli@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Nicholas Piggin <npiggin@...il.com>,
        Guo Ren <guoren@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: [RFC PATCH 1/5] trace: Add trace_ipi_send_{cpu, cpumask}

trace_ipi_raise is unsuitable for generically tracing IPI sources; add a
variant of it that takes a callsite and a CPU. Define a macro helper for
handling IPIs sent to multiple CPUs.

Signed-off-by: Valentin Schneider <vschneid@...hat.com>
---
 include/trace/events/ipi.h | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/include/trace/events/ipi.h b/include/trace/events/ipi.h
index 0be71dad6ec0..fd2f2aeb36fe 100644
--- a/include/trace/events/ipi.h
+++ b/include/trace/events/ipi.h
@@ -35,6 +35,33 @@ TRACE_EVENT(ipi_raise,
 	TP_printk("target_mask=%s (%s)", __get_bitmask(target_cpus), __entry->reason)
 );
 
+TRACE_EVENT(ipi_send_cpu,
+
+	TP_PROTO(unsigned long callsite, unsigned int cpu),
+
+	TP_ARGS(callsite, cpu),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, callsite)
+		__field(unsigned int, cpu)
+	),
+
+	TP_fast_assign(
+		__entry->callsite = callsite;
+		__entry->cpu      = cpu;
+	),
+
+	TP_printk("callsite=%pS target_cpu=%d", (void *)__entry->callsite, __entry->cpu)
+);
+
+#define trace_ipi_send_cpumask(callsite, mask) do {		\
+	if (static_key_false(&__tracepoint_ipi_send_cpu.key)) { \
+		int cpu;					\
+		for_each_cpu(cpu, mask)				\
+			trace_ipi_send_cpu(callsite, cpu);	\
+	}							\
+} while (0)
+
 DECLARE_EVENT_CLASS(ipi_handler,
 
 	TP_PROTO(const char *reason),
-- 
2.31.1