From: Nicolas Pitre <nicolas.pitre@linaro.org>
To: Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linaro-kernel@lists.linaro.org
Subject: [PATCH 2/4] ARM: add IPI tracepoints
Date: Fri, 18 Jul 2014 01:18:53 -0400 [thread overview]
Message-ID: <1405660735-13408-3-git-send-email-nicolas.pitre@linaro.org> (raw)
In-Reply-To: <1405660735-13408-1-git-send-email-nicolas.pitre@linaro.org>
The strings used to list IPIs in /proc/interrupts are reused for tracing
purposes.
Signed-off-by: Nicolas Pitre <nico@linaro.org>
---
arch/arm/kernel/smp.c | 72 ++++++++++++++++++++++++++++++++-------------------
1 file changed, 45 insertions(+), 27 deletions(-)
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 7c4fada440..daedff319b 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -47,6 +47,9 @@
#include <asm/mach/arch.h>
#include <asm/mpu.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/ipi.h>
+
/*
* as from 2.5, kernels no longer have an init_tasks structure
* so we need some other way of telling a new secondary core
@@ -430,38 +433,19 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
}
}
-static void (*smp_cross_call)(const struct cpumask *, unsigned int);
+static void (*__smp_cross_call)(const struct cpumask *, unsigned int);
void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int))
{
- if (!smp_cross_call)
- smp_cross_call = fn;
-}
-
-void arch_send_call_function_ipi_mask(const struct cpumask *mask)
-{
- smp_cross_call(mask, IPI_CALL_FUNC);
-}
-
-void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
-{
- smp_cross_call(mask, IPI_WAKEUP);
-}
-
-void arch_send_call_function_single_ipi(int cpu)
-{
- smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
+ if (!__smp_cross_call)
+ __smp_cross_call = fn;
}
-#ifdef CONFIG_IRQ_WORK
-void arch_irq_work_raise(void)
-{
- if (is_smp())
- smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
-}
+static const char *ipi_types[NR_IPI]
+#ifdef CONFIG_TRACING
+__tracepoint_string
#endif
-
-static const char *ipi_types[NR_IPI] = {
+= {
#define S(x,s) [x] = s
S(IPI_WAKEUP, "CPU wakeup interrupts"),
S(IPI_TIMER, "Timer broadcast interrupts"),
@@ -473,6 +457,12 @@ static const char *ipi_types[NR_IPI] = {
S(IPI_COMPLETION, "completion interrupts"),
};
+static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)
+{
+ trace_ipi_raise(target, ipi_types[ipinr]);
+ __smp_cross_call(target, ipinr);
+}
+
void show_ipi_list(struct seq_file *p, int prec)
{
unsigned int cpu, i;
@@ -499,6 +489,29 @@ u64 smp_irq_stat_cpu(unsigned int cpu)
return sum;
}
+void arch_send_call_function_ipi_mask(const struct cpumask *mask)
+{
+ smp_cross_call(mask, IPI_CALL_FUNC);
+}
+
+void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
+{
+ smp_cross_call(mask, IPI_WAKEUP);
+}
+
+void arch_send_call_function_single_ipi(int cpu)
+{
+ smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
+}
+
+#ifdef CONFIG_IRQ_WORK
+void arch_irq_work_raise(void)
+{
+ if (is_smp())
+ smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
+}
+#endif
+
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
void tick_broadcast(const struct cpumask *mask)
{
@@ -556,8 +569,10 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
unsigned int cpu = smp_processor_id();
struct pt_regs *old_regs = set_irq_regs(regs);
- if (ipinr < NR_IPI)
+ if ((unsigned)ipinr < NR_IPI) {
+ trace_ipi_entry(ipi_types[ipinr]);
__inc_irq_stat(cpu, ipi_irqs[ipinr]);
+ }
switch (ipinr) {
case IPI_WAKEUP:
@@ -612,6 +627,9 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
cpu, ipinr);
break;
}
+
+ if ((unsigned)ipinr < NR_IPI)
+ trace_ipi_exit(ipi_types[ipinr]);
set_irq_regs(old_regs);
}
--
1.8.4.108.g55ea5f6
next prev parent reply other threads:[~2014-07-18 5:20 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-18 5:18 [PATCH 0/4] basic IPI tracing Nicolas Pitre
2014-07-18 5:18 ` [PATCH 1/4] tracepoint: add generic tracepoint definitions for " Nicolas Pitre
2014-07-23 13:24 ` Daniel Lezcano
2014-07-18 5:18 ` Nicolas Pitre [this message]
2014-07-18 20:04 ` [PATCH 2/4] ARM: add IPI tracepoints Steven Rostedt
2014-07-18 20:55 ` Nicolas Pitre
2014-07-18 21:22 ` Steven Rostedt
2014-07-19 2:55 ` Nicolas Pitre
2014-07-19 3:30 ` Steven Rostedt
2014-07-19 19:10 ` Ard Biesheuvel
2014-07-19 20:28 ` Steven Rostedt
2014-07-19 20:50 ` Ard Biesheuvel
2014-07-19 21:56 ` Steven Rostedt
2014-07-19 21:59 ` Nicolas Pitre
2014-07-23 22:18 ` Nicolas Pitre
2014-07-18 5:18 ` [PATCH 3/4] ARM64: " Nicolas Pitre
2014-07-21 10:36 ` Catalin Marinas
2014-07-18 5:18 ` [PATCH 4/4] (RFC) X86: " Nicolas Pitre
2014-07-18 20:27 ` Steven Rostedt
2014-07-18 20:59 ` Nicolas Pitre
2014-07-21 22:54 ` Steven Rostedt
2014-07-23 22:00 ` Nicolas Pitre
2014-07-20 20:25 ` Davidlohr Bueso
2014-07-21 22:35 ` Nicolas Pitre
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