linux-kernel - [PATCH 7/7] tracing/hyper-v: trace hyperv_mmu_flush_tlb

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Date:   Fri,  7 Apr 2017 13:27:01 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     devel@...uxdriverproject.org, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Jork Loeser <Jork.Loeser@...rosoft.com>
Subject: [PATCH 7/7] tracing/hyper-v: trace hyperv_mmu_flush_tlb_others()

Add Hyper-V tracing subsystem and trace hyperv_mmu_flush_tlb_others().
Tracing is done the same way we do xen_mmu_flush_tlb_others().

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 MAINTAINERS                   |  1 +
 arch/x86/hyperv/mmu.c         |  6 ++++++
 include/trace/events/hyperv.h | 30 ++++++++++++++++++++++++++++++
 3 files changed, 37 insertions(+)
 create mode 100644 include/trace/events/hyperv.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 819d5e8..9785d98 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6057,6 +6057,7 @@ F:	drivers/scsi/storvsc_drv.c
 F:	drivers/uio/uio_hv_generic.c
 F:	drivers/video/fbdev/hyperv_fb.c
 F:	include/linux/hyperv.h
+F:	include/trace/events/hyperv.h
 F:	tools/hv/
 F:	Documentation/ABI/stable/sysfs-bus-vmbus
 
diff --git a/arch/x86/hyperv/mmu.c b/arch/x86/hyperv/mmu.c
index fb487cb..61f2a5b 100644
--- a/arch/x86/hyperv/mmu.c
+++ b/arch/x86/hyperv/mmu.c
@@ -5,6 +5,10 @@
 #include <asm/tlbflush.h>
 #include <asm/msr.h>
 #include <asm/fpu/api.h>
+#include <trace/events/hyperv.h>
+
+#define CREATE_TRACE_POINTS
+DEFINE_TRACE(hyperv_mmu_flush_tlb_others);
 
 /*
  * Arbitrary number; we need to pre-allocate per-cpu struct for doing TLB
@@ -36,6 +40,8 @@ static void hyperv_flush_tlb_others(const struct cpumask *cpus,
 	u64 status = -1ULL;
 	int cpu, vcpu, gva_n;
 
+	trace_hyperv_mmu_flush_tlb_others(cpus, mm, start, end);
+
 	if (!pcpu_flush || !hv_hypercall_pg)
 		goto do_native;
 
diff --git a/include/trace/events/hyperv.h b/include/trace/events/hyperv.h
new file mode 100644
index 0000000..e37e72d
--- /dev/null
+++ b/include/trace/events/hyperv.h
@@ -0,0 +1,30 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM hyperv
+
+#if !defined(_TRACE_HYPERV_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_HYPERV_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(hyperv_mmu_flush_tlb_others,
+	    TP_PROTO(const struct cpumask *cpus, struct mm_struct *mm,
+		     unsigned long addr, unsigned long end),
+	    TP_ARGS(cpus, mm, addr, end),
+	    TP_STRUCT__entry(
+		    __field(unsigned int, ncpus)
+		    __field(struct mm_struct *, mm)
+		    __field(unsigned long, addr)
+		    __field(unsigned long, end)
+		    ),
+	    TP_fast_assign(__entry->ncpus = cpumask_weight(cpus);
+			   __entry->mm = mm;
+			   __entry->addr = addr,
+			   __entry->end = end),
+	    TP_printk("ncpus %d mm %p addr %lx, end %lx",
+		      __entry->ncpus, __entry->mm, __entry->addr, __entry->end)
+	);
+
+#endif /* _TRACE_HYPERV_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
-- 
2.9.3