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Next: [RFC 0/2] apic: tracing IPI events
From: Jiri Olsa on 5 Aug 2010 07:20
Adding apic IPI trace event.

wbr,
jirka


Signed-off-by: Jiri Olsa <jolsa(a)redhat.com>
---
arch/x86/include/asm/apic_trace.h | 53 +++++++++++++++++++++++++++++++++++++
arch/x86/kernel/apic/apic.c | 21 ++++++++++++++
2 files changed, 74 insertions(+), 0 deletions(-)
create mode 100644 arch/x86/include/asm/apic_trace.h

diff --git a/arch/x86/include/asm/apic_trace.h b/arch/x86/include/asm/apic_trace.h
new file mode 100644
index 0000000..03eea8e
--- /dev/null
+++ b/arch/x86/include/asm/apic_trace.h
@@ -0,0 +1,53 @@
+
+#if !defined(_TRACE_APIC_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_APIC_H
+
+#include <linux/tracepoint.h>
+#include <linux/cpumask.h>
+
+#define BUFSIZE (50)
+#define CPU_MASK_PRINTK() ({ \
+ const char *ret = p->buffer + p->len; \
+ char buf[BUFSIZE]; \
+ bitmap_scnlistprintf(buf, BUFSIZE, \
+ __entry->mask, nr_cpumask_bits); \
+ trace_seq_printf(p, "to cpu(s) %s\n", buf); \
+ ret; \
+})
+
+/**
+ * apic_send_IPI_mask - called before the IPI is send
+ * @mask: cpu mask the IPI is directed to
+ * @vector: interrupt number
+ */
+TRACE_EVENT(apic_send_IPI,
+
+ TP_PROTO(const struct cpumask *mask, int vector),
+
+ TP_ARGS(mask, vector),
+
+ TP_STRUCT__entry(
+ __array(unsigned long, mask, nr_cpumask_bits)
+ __field(int, vector)
+ ),
+
+ TP_fast_assign(
+ bitmap_copy(__entry->mask, cpumask_bits(mask), nr_cpumask_bits);
+ __entry->vector = vector;
+ ),
+
+ TP_printk("irq %d, %s", __entry->vector, CPU_MASK_PRINTK())
+);
+
+#endif /* _TRACE_APIC_H */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM irq
+
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE apic_trace
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH asm
+
+#include <trace/define_trace.h>
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 2ab2f26..d8cddf0 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -53,6 +53,9 @@
#include <asm/kvm_para.h>
#include <asm/tsc.h>

+#define CREATE_TRACE_POINTS
+#include <asm/apic_trace.h>
+
unsigned int num_processors;

unsigned disabled_cpus __cpuinitdata;
@@ -2335,25 +2338,43 @@ late_initcall(lapic_insert_resource);

void apic_send_IPI_mask(const struct cpumask *mask, int vector)
{
+ trace_apic_send_IPI(mask, vector);
+
apic->send_IPI_mask(mask, vector);
}

void apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
{
+ trace_apic_send_IPI(mask, vector);
+
apic->send_IPI_mask_allbutself(mask, vector);
}

void apic_send_IPI_allbutself(int vector)
{
+ struct cpumask mask;
+
+ cpumask_copy(&mask, cpu_possible_mask);
+ cpumask_clear_cpu(smp_processor_id(), &mask);
+ trace_apic_send_IPI(&mask, vector);
+
apic->send_IPI_allbutself(vector);
}

void apic_send_IPI_all(int vector)
{
+ trace_apic_send_IPI(cpu_online_mask, vector);
+
apic->send_IPI_all(vector);
}

void apic_send_IPI_self(int vector)
{
+ struct cpumask mask;
+
+ cpumask_clear(&mask);
+ cpumask_set_cpu(smp_processor_id(), &mask);
+ trace_apic_send_IPI(&mask, vector);
+
apic->send_IPI_self(vector);
}
--
1.7.2

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